diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..496ee2c
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.DS_Store
\ No newline at end of file
diff --git a/Atom-matrix b/Atom-matrix
new file mode 100644
index 0000000..62f1c5e
--- /dev/null
+++ b/Atom-matrix
@@ -0,0 +1,117 @@
+#include <M5Atom.h>
+#include <BLEDevice.h>
+#include <BLEUtils.h>
+#include <BLEScan.h>
+#include <BLEAdvertisedDevice.h>
+#include <esp_now.h>
+#include <WiFi.h>
+#include <esp_wifi.h>
+
+// --- ตั้งค่าระยะที่ต้องการ ---
+const int RSSI_THRESHOLD = -45; 
+
+// หน่วงเวลาห้ามส่งซ้ำ (2000ms = 2 วินาที)
+const int COOLDOWN_TIME = 5000;  
+
+BLEUUID targetUUID = BLEUUID("1234");
+
+// MAC Address ของ Echo 
+uint8_t echoAddress[] = {0x90, 0x15, 0x06, 0xFD, 0xF2, 0xF8};
+
+// ✅ 
+int checkIcon[] = {
+    15, // หางสั้น (ซ้ายล่าง)
+    21, // จุดกลับตัว (ล่างสุด)
+    17, // เส้นเฉียงขึ้น
+    13, // เส้นเฉียงขึ้น
+    9   // ปลายหางยาว (ขวาบน)
+};
+
+BLEScan* pBLEScan;
+unsigned long lastTriggerTime = 0; 
+
+void setup() {
+    M5.begin(true, false, true); 
+    delay(10);
+
+    WiFi.mode(WIFI_STA);
+    if (esp_now_init() != ESP_OK) {
+        Serial.println("Error initializing ESP-NOW");
+        return;
+    }
+
+    esp_now_peer_info_t peerInfo;
+    memset(&peerInfo, 0, sizeof(peerInfo));
+    for (int i = 0; i < 6; i++) {
+        peerInfo.peer_addr[i] = echoAddress[i]; 
+    }
+    peerInfo.channel = 0;  
+    peerInfo.encrypt = false;
+    
+    if (esp_now_add_peer(&peerInfo) != ESP_OK){
+        Serial.println("Failed to add peer");
+        return;
+    }
+
+    BLEDevice::init("");
+    pBLEScan = BLEDevice::getScan(); 
+    pBLEScan->setActiveScan(true);   
+    pBLEScan->setInterval(100);
+    pBLEScan->setWindow(99);
+
+    Serial.println("System Ready: Scanning...");
+    M5.dis.fillpix(0x0000FF); // เริ่มต้น: สีน้ำเงิน
+}
+
+void loop() {
+    M5.update();
+    
+    //แก้: ใช้ Pointer (*) เพื่อแก้ Error เก่า
+    BLEScanResults *foundDevices = pBLEScan->start(1, false);
+    
+    bool foundTarget = false;
+    int targetRSSI = -999;
+
+    for (int i = 0; i < foundDevices->getCount(); i++) {
+        BLEAdvertisedDevice device = foundDevices->getDevice(i);
+        
+        // เช็ค UUID
+        if (device.haveServiceUUID() && device.isAdvertisingService(targetUUID)) {
+            targetRSSI = device.getRSSI();
+            Serial.printf("Target Found! RSSI: %d\n", targetRSSI);
+            
+            if (targetRSSI > RSSI_THRESHOLD) {
+                foundTarget = true;
+            }
+        }
+    }
+    
+    // --- ตัดสินใจ ---
+    if (foundTarget) {
+        
+        // ---ติ๊กถูก (Checkmark) ---
+        M5.dis.clear(); // ล้างสีเดิมก่อน
+        for (int i = 0; i < 5; i++) {
+            M5.dis.drawpix(checkIcon[i], 0x00FF00); // วาดจุดสีเขียวตามแบบแปลน
+        }
+        // -------------------------------------------
+
+        // เช็ค Cooldown ก่อนส่งคำสั่ง
+        if (millis() - lastTriggerTime > COOLDOWN_TIME) {
+            
+            Serial.println(">>> UNLOCK! Sending to Echo <<<");
+
+            uint8_t data = 1; 
+            esp_now_send(echoAddress, &data, sizeof(data));
+
+            lastTriggerTime = millis(); 
+        } 
+
+    } else {
+        // ไม่เจอ -> สีน้ำเงิน 🔵
+        M5.dis.fillpix(0x0000ff); 
+        Serial.println("Searching...");
+    }
+
+    pBLEScan->clearResults(); 
+}
diff --git a/Atom_echo/Atom_echo.ino b/Atom_echo/Atom_echo.ino
new file mode 100644
index 0000000..fa14f81
--- /dev/null
+++ b/Atom_echo/Atom_echo.ino
@@ -0,0 +1,115 @@
+#include <M5Atom.h>
+#include <esp_now.h>
+#include <WiFi.h>
+#include <driver/i2s.h>
+#include <esp_wifi.h> // เพิ่มเพื่อบังคับ Channel
+
+#define CONFIG_I2S_BCK_PIN 19
+#define CONFIG_I2S_LRCK_PIN 33
+#define CONFIG_I2S_DATA_PIN 22
+#define CONFIG_I2S_DATA_IN_PIN 23
+
+// ตั้งค่า I2S
+void InitI2S() {
+    i2s_config_t i2s_config = {
+        .mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_TX),
+        .sample_rate = 44100,
+        .bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT,
+        .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,
+        .communication_format = I2S_COMM_FORMAT_I2S_MSB, // ใช้ MSB เสียงจะดีกว่า
+        .intr_alloc_flags = ESP_INTR_FLAG_LEVEL1,
+        .dma_buf_count = 8,
+        .dma_buf_len = 64
+    };
+    i2s_pin_config_t pin_config = {
+        .bck_io_num = CONFIG_I2S_BCK_PIN,
+        .ws_io_num = CONFIG_I2S_LRCK_PIN,
+        .data_out_num = CONFIG_I2S_DATA_PIN,
+        .data_in_num = CONFIG_I2S_DATA_IN_PIN
+    };
+    i2s_driver_install(I2S_NUM_0, &i2s_config, 0, NULL);
+    i2s_set_pin(I2S_NUM_0, &pin_config);
+    i2s_set_clk(I2S_NUM_0, 44100, I2S_BITS_PER_SAMPLE_16BIT, I2S_CHANNEL_MONO);
+}
+
+// สร้างเสียง Beep
+void PlayBeep(int freq, int duration_ms) {
+    size_t bytes_written;
+    int samples = 44100 * duration_ms / 1000;
+    int16_t *buffer = (int16_t *)malloc(samples * 2);
+    if (!buffer) return;
+    
+    int period = 44100 / freq; 
+    int volume = 2000; 
+
+    for (int i = 0; i < samples; i++) {
+        if ((i % period) < (period / 2)) buffer[i] = volume;
+        else buffer[i] = -volume;
+    }
+    
+    i2s_write(I2S_NUM_0, buffer, samples * 2, &bytes_written, portMAX_DELAY);
+    free(buffer);
+
+    // ล้างท่อเสียง
+    int16_t silence[1024] = {0};
+    for (int k = 0; k < 3; k++) {
+        i2s_write(I2S_NUM_0, silence, sizeof(silence), &bytes_written, portMAX_DELAY);
+    }
+}
+
+bool triggerSound = false;
+
+// Callback รับข้อมูล
+void OnDataRecv(const uint8_t * mac, const uint8_t *incomingData, int len) {
+    if (len > 0 && *incomingData == 1) {
+        triggerSound = true; 
+    }
+}
+
+void setup() {
+    M5.begin(true, false, true);
+    InitI2S();
+    Serial.begin(115200);
+
+    // 1. โชว์ MAC Address ครั้งเดียวพอ (ดูใน Serial Monitor)
+    WiFi.mode(WIFI_STA);
+    Serial.println("\n--------------------------------");
+    Serial.print("MY MAC ADDRESS:  ");
+    Serial.println(WiFi.macAddress());
+    Serial.println("--------------------------------");
+
+    // 2. ⚠️ บังคับ Channel 1 (เพื่อให้ตรงกับ Matrix) ⚠️
+    esp_wifi_set_channel(1, WIFI_SECOND_CHAN_NONE);
+
+    // 3. Test Sound
+    Serial.println("System Start: Testing Beep...");
+    M5.dis.drawpix(0, 0xFFFFFF); 
+    PlayBeep(2000, 100); 
+    M5.dis.drawpix(0, 0x0000FF);
+    
+    if (esp_now_init() != ESP_OK) return;
+    esp_now_register_recv_cb(OnDataRecv);
+}
+
+void loop() {
+    M5.update();
+
+    // ปุ่มกดเทสเสียง
+    if (M5.Btn.wasPressed()) {
+        Serial.println("Button Clicked!");
+        triggerSound = true; 
+    }
+    
+    // เมื่อได้รับคำสั่งจาก Matrix
+    if (triggerSound) {
+        M5.dis.drawpix(0, 0x00FF00); // สีเขียว
+        
+        Serial.println("Matrix Command -> Beep!");
+        PlayBeep(1500, 100); 
+        delay(50);
+        PlayBeep(2500, 200); 
+        
+        triggerSound = false; 
+        M5.dis.drawpix(0, 0x0000FF); // กลับเป็นน้ำเงิน
+    }
+}
\ No newline at end of file
diff --git a/M5Paper/M5Paper.ino b/M5Paper/M5Paper.ino
new file mode 100644
index 0000000..a922a67
--- /dev/null
+++ b/M5Paper/M5Paper.ino
@@ -0,0 +1,114 @@
+#include <M5EPD.h>
+
+// สร้าง Canvas 2 ใบ (ใบใหญ่=เมนู, ใบเล็ก=Status)
+M5EPD_Canvas canvas(&M5.EPD);        
+M5EPD_Canvas status_canvas(&M5.EPD); 
+
+int selectedChoice = 0;
+
+void drawMenu() {
+    canvas.createCanvas(540, 960); 
+    
+    // Header
+    canvas.setTextSize(4);
+    canvas.drawString("What did you do?", 30, 50);
+
+    canvas.setTextSize(3);
+    
+    
+    // ข้อ 1
+    canvas.drawRect(0, 130, 540, 80, 15);
+    canvas.drawString("1. Walk 1000 steps", 30, 155); 
+    canvas.drawString("   --> 10 CCoin", 30, 185);
+
+    // ข้อ 2
+    canvas.drawRect(0, 230, 540, 80, 15);
+    canvas.drawString("2. Recycle bottle", 30, 255);
+    canvas.drawString("   --> 5 CCoin", 30, 285);
+
+    // ข้อ 3
+    canvas.drawRect(0, 330, 540, 80, 15);
+    canvas.drawString("3. Bike 1 km", 30, 355);
+    canvas.drawString("   --> 20 CCoin", 30, 385);
+
+    // ข้อ 4
+    canvas.drawRect(0, 430, 540, 80, 15);
+    canvas.drawString("4. Reuse cup", 30, 455);
+    canvas.drawString("   --> 5 CCoin", 30, 485);
+
+    canvas.fillRect(120, 550, 300, 100, 15);
+    canvas.setTextColor(0, 15); 
+    canvas.setTextSize(4);
+    canvas.drawString("Submit", 200, 585);
+    
+    canvas.setTextColor(15, 0); 
+
+    canvas.pushCanvas(0, 0, UPDATE_MODE_GC16);
+}
+
+void updateStatus(String msg) {
+    status_canvas.createCanvas(540, 100); 
+    status_canvas.fillCanvas(0);          
+    status_canvas.setTextSize(3);
+    status_canvas.drawString("Status: " + msg, 20, 20);
+
+    status_canvas.pushCanvas(0, 700, UPDATE_MODE_DU4); 
+
+    Serial.print("Status: ");
+    Serial.println(msg);
+}
+
+void setup() {
+    M5.begin();
+    
+    Serial.begin(115200);
+    
+    M5.EPD.SetRotation(90); 
+    M5.EPD.Clear(true);
+    M5.TP.SetRotation(0); // หมุนระบบสัมผัสให้ตรงกัน
+
+    drawMenu();     
+}
+
+void loop() {
+    if (M5.TP.available()) {
+        if (!M5.TP.isFingerUp()) {
+            M5.TP.update();
+            
+            // อ่านค่า X (0-540) และ Y (0-960)
+            int x = M5.TP.readFingerX(0);
+            int y = M5.TP.readFingerY(0);
+
+            Serial.printf("X: %d, Y: %d\n", x, y);
+
+            if (x >= 130 && x <= 229) {
+                selectedChoice = 1;
+                updateStatus("Selected: Walk");
+            }
+            else if (x >= 230 && x <= 329) {
+                selectedChoice = 2;
+                updateStatus("Selected: Recycle");
+            }
+            else if (x >= 330 && x <= 410) {
+                selectedChoice = 3;
+                updateStatus("Selected: Bike");
+            }
+            else if (x >= 430 && x <= 510) {
+                selectedChoice = 4;
+                updateStatus("Selected: Reuse Cup");
+            }
+            // ปุ่ม Submit (เช็ค X ให้อยู่ในกรอบ 120-420)
+            else if (x >= 550 && x <= 650 && y >= 120 && y <= 420) {
+                if (selectedChoice == 0) {
+                    updateStatus("Please select first!");
+                } else {
+                    updateStatus("Submitting...");
+                    delay(1000);
+                    updateStatus("Sent Successfully!");
+                    selectedChoice = 0;
+                }
+            }
+            delay(100);
+        }
+    }
+}
\ No newline at end of file
diff --git a/Station2-Core2/include/README b/Station2-Core2/include/README
new file mode 100644
index 0000000..49819c0
--- /dev/null
+++ b/Station2-Core2/include/README
@@ -0,0 +1,37 @@
+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the convention is to give header files names that end with `.h'.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html
diff --git a/Station2-Core2/include/ShowcaseProtocol.h b/Station2-Core2/include/ShowcaseProtocol.h
new file mode 100644
index 0000000..ee8b0bf
--- /dev/null
+++ b/Station2-Core2/include/ShowcaseProtocol.h
@@ -0,0 +1,106 @@
+// File: ShowcaseProtocol.h
+// Project: StationX Showcase Network Protocol
+// Purpose: Shared message definitions and utility helpers used by all stations
+// Notes:
+//  - This header is intentionally simple and portable across ESP32-based stations.
+//  - Messages are packed to a fixed size to ensure stable behavior over ESP-NOW.
+//  - Non-functional, documentation-only changes made on 2025-12-06: clearer section comments.
+
+#ifndef SHOWCASE_PROTOCOL_H
+#define SHOWCASE_PROTOCOL_H
+
+#include <Arduino.h>
+#include <cstring>
+
+// ============================================
+// SYSTEM CONFIGURATION
+// ============================================
+#define BROADCAST_CHANNEL 1
+static const uint8_t BROADCAST_MAC[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
+#define MSG_MAX_LENGTH 64
+
+// ============================================
+// MESSAGE TYPES - Enum for type safety
+// ============================================
+enum MessageType : uint8_t {
+    MSG_IDENTITY_ASSIGN    = 1,   // St1 Core2 -> StickC
+    MSG_AUTH_REQUEST       = 2,   // St2 Matrix -> StickC
+    MSG_AUTH_SUCCESS       = 3,   // St2 Echo/Matrix -> StickC
+    MSG_EARN_COIN          = 4,   // St3 Paper -> StickC
+    MSG_SPEND_REQUEST      = 5,   // St4 Paper -> StickC
+    MSG_SPEND_CONFIRM      = 6,   // St4 Matrix -> StickC
+    MSG_RESET_ALL          = 99,  // Reset Button -> All
+    MSG_HEARTBEAT          = 100, // Keep-alive
+    MSG_BALANCE_UPDATE     = 101, // StickC -> All (broadcast balance)
+    MSG_ERROR              = 200  // Error message
+};
+
+// ============================================
+// DATA STRUCTURES - Fixed 64 bytes for stability
+// ============================================
+typedef struct {
+    uint8_t type;                  // MessageType enum
+    char username[32];             // Username (max 31 chars + null)
+    int32_t amount;                // Coin amount (int32 for safety)
+    char description[16];          // Activity/Menu name
+    uint8_t status;                // 0=pending, 1=success, 2=error
+    uint16_t checksum;             // Simple CRC16
+    uint32_t timestamp;            // Packet timestamp (anti-replay)
+    uint8_t padding[2];            // Padding to 64 bytes
+} __attribute__((packed)) ShowcaseMessage;
+
+// ============================================
+// COMMUNICATION CONSTANTS
+// ============================================
+#define STICKC_HTTP_PORT 8888
+#define CORE2_HTTP_PORT 8888
+#define MATRIX_HTTP_PORT 8888
+#define PAPER_HTTP_PORT 8888
+
+// IP addresses (192.168.4.x for AP mode)
+#define STICKC_IP "192.168.4.2"
+#define CORE2_IP "192.168.4.1"
+#define MATRIX_IP "192.168.4.3"
+#define PAPER_IP "192.168.4.4"
+
+// ============================================
+// UTILITY FUNCTIONS
+// ============================================
+static inline uint16_t calculateChecksum(const ShowcaseMessage &msg) {
+    uint16_t crc = 0xFFFF;
+    const uint8_t *data = (const uint8_t *)&msg;
+    for (size_t i = 0; i < sizeof(msg) - 2; i++) {
+        crc ^= data[i];
+        for (int j = 0; j < 8; j++) {
+            crc = (crc >> 1) ^ (0xA001 & (-(crc & 1)));
+        }
+    }
+    return crc;
+}
+
+static inline bool verifyChecksum(const ShowcaseMessage &msg) {
+    return calculateChecksum(msg) == msg.checksum;
+}
+
+static inline void setChecksum(ShowcaseMessage &msg) {
+    msg.checksum = calculateChecksum(msg);
+}
+
+// Create a properly formatted message
+static inline ShowcaseMessage createMessage(uint8_t type, const char *username = "",
+                                            int32_t amount = 0, const char *description = "") {
+    ShowcaseMessage msg;
+    memset(&msg, 0, sizeof(msg));
+    msg.type = type;
+    msg.status = 0;  // pending
+    msg.timestamp = millis();
+    
+    if (username) strncpy(msg.username, username, 31);
+    if (description) strncpy(msg.description, description, 15);
+    msg.amount = amount;
+    
+    setChecksum(msg);
+    return msg;
+}
+
+#endif
diff --git a/Station2-Core2/lib/ProjectShared/Participant.h b/Station2-Core2/lib/ProjectShared/Participant.h
new file mode 100644
index 0000000..ba1c302
--- /dev/null
+++ b/Station2-Core2/lib/ProjectShared/Participant.h
@@ -0,0 +1,49 @@
+// Participant.h: Data Structure สำหรับจัดการข้อมูลผู้เข้าร่วม (Username, Status, CCoin)
+
+#ifndef PARTICIPANT_H
+#define PARTICIPANT_H
+
+#include <Arduino.h>
+
+class Participant {
+public:
+    String Username;
+    bool isAuthenticated;
+    int CCoin_Balance;
+    String alertText;
+
+    Participant() {
+        // ค่าเริ่มต้นเมื่อเริ่มต้นระบบหรือทำการ Reset
+        reset();
+    }
+
+    void reset() {
+        Username = "";
+        isAuthenticated = false;
+        CCoin_Balance = 0;
+        alertText = "-";
+    }
+
+    String getAuthStatus() {
+        return isAuthenticated ? "✓" : "X";
+    }
+
+    // ฟังก์ชันสำหรับส่งข้อมูลในรูปแบบ JSON
+    String toJSON() {
+        String json = "{";
+        json += "\"username\": \"" + Username + "\",";
+        json += "\"isAuthenticated\": " + String(isAuthenticated ? "true" : "false") + ",";
+        json += "\"ccoin_balance\": " + String(CCoin_Balance) + ",";
+        json += "\"alert_text\": \"" + alertText + "\"";
+        json += "}";
+        return json;
+    }
+
+    // ฟังก์ชันสำหรับอัปเดตข้อมูลจาก JSON (ใช้เมื่อรับ Request)
+    void updateFromJSON(const String& json) {
+        // ในโปรเจกต์นี้จะทำการแยก Parser JSON ในแต่ละอุปกรณ์เพื่อให้ง่ายต่อการจัดการ
+        // แต่โครงสร้างนี้ช่วยให้รู้ว่ามีข้อมูลอะไรบ้าง
+    }
+};
+
+#endif // PARTICIPANT_H
\ No newline at end of file
diff --git a/Station2-Core2/lib/ProjectShared/config.h b/Station2-Core2/lib/ProjectShared/config.h
new file mode 100644
index 0000000..fcf1f94
--- /dev/null
+++ b/Station2-Core2/lib/ProjectShared/config.h
@@ -0,0 +1,37 @@
+#ifndef CONFIG_H
+#define CONFIG_H
+
+#include <Arduino.h>
+
+// --- SoftAP Configuration (Hosted by Station 1) ---
+const char* AP_SSID = "Web3_Showcase_AP";
+const char* AP_PASSWORD = NULL; // Open network for easy Captive Portal
+
+// --- IP Address Mapping ---
+// Gateway (Station 1) must be x.x.x.1
+IPAddress IP_STATION1_AP(192, 168, 4, 1);     // Core2: Identity & AP
+IPAddress IP_STATION2_MON(192, 168, 4, 2);    // Core2: Auth Monitor
+IPAddress IP_RESET_MON(192, 168, 4, 3);       // Core Basic: System Monitor & Reset
+
+IPAddress IP_STICKC(192, 168, 4, 10);         // Wearable
+IPAddress IP_ATOM_MATRIX(192, 168, 4, 20);    // S2/S4 Sensor
+IPAddress IP_ATOM_ECHO(192, 168, 4, 30);      // Sound
+IPAddress IP_PAPER_S3(192, 168, 4, 40);       // Earn
+IPAddress IP_PAPER_S4(192, 168, 4, 50);       // Spend
+
+IPAddress NETMASK(255, 255, 255, 0);
+
+// --- Endpoints ---
+#define ENDPOINT_HEARTBEAT "/heartbeat"
+#define ENDPOINT_SET_USER "/set_user"
+#define ENDPOINT_SET_AUTH "/set_auth"
+#define ENDPOINT_RESET_GLOBAL "/reset_global"
+
+// [เพิ่มเติม] เพิ่ม Endpoints สำหรับ Earn และ Spend ที่หายไป
+#define ENDPOINT_EARN_COIN "/earn_coin"
+#define ENDPOINT_SPEND_COIN "/spend_coin"
+
+// [เพิ่มเติม] Endpoints สำหรับ Atom Matrix (เผื่อใช้)
+#define ENDPOINT_GET_ORDER "/get_order"
+
+#endif // CONFIG_H
\ No newline at end of file
diff --git a/Station2-Core2/lib/README b/Station2-Core2/lib/README
new file mode 100644
index 0000000..9379397
--- /dev/null
+++ b/Station2-Core2/lib/README
@@ -0,0 +1,46 @@
+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into the executable file.
+
+The source code of each library should be placed in a separate directory
+("lib/your_library_name/[Code]").
+
+For example, see the structure of the following example libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional. for custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+Example contents of `src/main.c` using Foo and Bar:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+The PlatformIO Library Dependency Finder will find automatically dependent
+libraries by scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html
diff --git a/Station2-Core2/platformio.ini b/Station2-Core2/platformio.ini
new file mode 100644
index 0000000..0972119
--- /dev/null
+++ b/Station2-Core2/platformio.ini
@@ -0,0 +1,15 @@
+[env:m5stack-core2]
+platform = espressif32
+board = m5stack-core2
+framework = arduino
+monitor_speed = 115200
+upload_speed = 1500000
+
+; [สำคัญ] ชี้ไปที่โฟลเดอร์ lib นอกโปรเจกต์
+lib_extra_dirs = ../lib 
+
+lib_deps = 
+    m5stack/M5Core2 @ ^0.1.9
+    esphome/ESPAsyncWebServer-esphome @ ^3.3.0
+    esphome/AsyncTCP-esphome @ ^2.1.4
+    bblanchon/ArduinoJson @ ^7.0.4
\ No newline at end of file
diff --git a/Station2-Core2/src/main.cpp b/Station2-Core2/src/main.cpp
new file mode 100644
index 0000000..1449b26
--- /dev/null
+++ b/Station2-Core2/src/main.cpp
@@ -0,0 +1,111 @@
+#include <M5Core2.h>
+#include <WiFi.h>
+#include <esp_now.h>
+
+// --- ส่วนประกาศตัวแปรและโครงสร้างข้อมูล ---
+typedef struct struct_message {
+  char type[10];     
+  char username[50];  
+  int status;
+} struct_message;
+
+struct_message incomingReadings;
+
+volatile bool new_data_received = false; 
+volatile bool reset_triggered = false;   
+
+String display_username = "";
+
+// --- ส่วนแสดงผลหน้าจอ ---
+void displayResetScreen() {
+  M5.Lcd.fillScreen(BLACK);
+  M5.Lcd.setTextColor(WHITE, BLACK);
+  M5.Lcd.setTextSize(2);
+  M5.Lcd.setTextDatum(MC_DATUM);
+  
+  M5.Lcd.drawString("SYSTEM STATUS:", 160, 100);
+  M5.Lcd.setTextColor(CYAN, BLACK);
+  M5.Lcd.drawString("Waiting for Request...", 160, 140);
+}
+
+void displayAuthSuccess(String username) {
+  M5.Lcd.fillScreen(BLACK);
+  M5.Lcd.setTextColor(WHITE, BLACK);
+  M5.Lcd.setTextSize(3);
+  M5.Lcd.setTextDatum(MC_DATUM);
+  M5.Lcd.drawString("Verifying...", 160, 120);
+  
+  delay(500); 
+
+  M5.Lcd.fillScreen(GREEN);
+  M5.Lcd.setTextColor(BLACK, GREEN);
+  M5.Lcd.setTextSize(2);
+  
+  String verifyText = "Verifying (" + username + ")";
+  M5.Lcd.drawString(verifyText, 160, 90);
+  
+  M5.Lcd.setTextSize(3);
+  M5.Lcd.drawString("Authentication", 160, 140);
+  M5.Lcd.drawString("Successful", 160, 180);
+  
+  // Graphic
+  M5.Lcd.drawCircle(160, 50, 20, BLACK);
+  M5.Lcd.drawLine(150, 50, 160, 60, BLACK);
+  M5.Lcd.drawLine(160, 60, 175, 40, BLACK);
+}
+
+// --- ส่วนรับข้อมูล ESP-NOW ---
+void OnDataRecv(const uint8_t * mac_addr, const uint8_t *incomingData, int len) {
+  memcpy(&incomingReadings, incomingData, sizeof(incomingReadings));
+  
+  // กรณีได้รับคำสั่ง AUTH (ยืนยันตัวตน)
+  if (strcmp(incomingReadings.type, "AUTH") == 0 && incomingReadings.status == 1) {
+    display_username = String(incomingReadings.username);
+    new_data_received = true;
+    Serial.println("Command: AUTH RECEIVED");
+  }
+  
+  // กรณีได้รับคำสั่ง RESET (รีเซ็ตระบบ)
+  else if (strcmp(incomingReadings.type, "RESET") == 0) {
+    reset_triggered = true;
+    Serial.println("Command: RESET RECEIVED");
+  }
+}
+
+// --- Setup ---
+void setup() {
+  M5.begin();
+  Serial.begin(115200);
+
+  displayResetScreen();
+
+  WiFi.mode(WIFI_STA);
+
+  if (esp_now_init() != ESP_OK) {
+    Serial.println("Error initializing ESP-NOW");
+    return;
+  }
+  
+  // ลงทะเบียนฟังก์ชันรับข้อมูล (ส่วนที่ขาดไปก่อนหน้านี้)
+  esp_now_register_recv_cb(OnDataRecv);
+  Serial.println("Station 2 Ready...");
+}
+
+// --- Loop (ส่วนที่ขาดไปก่อนหน้านี้) ---
+void loop() {
+  
+  // 1. เช็คคำสั่ง RESET ก่อน (สำคัญสุด)
+  if (reset_triggered) {
+    displayResetScreen(); 
+    reset_triggered = false; 
+    new_data_received = false; 
+  }
+
+  // 2. เช็คคำสั่ง AUTH
+  if (new_data_received) {
+    displayAuthSuccess(display_username);
+    new_data_received = false;
+  }
+  
+  M5.update();
+}
diff --git a/Station2-Core2/test/README b/Station2-Core2/test/README
new file mode 100644
index 0000000..9b1e87b
--- /dev/null
+++ b/Station2-Core2/test/README
@@ -0,0 +1,11 @@
+
+This directory is intended for PlatformIO Test Runner and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/en/latest/advanced/unit-testing/index.html
diff --git a/Station2-Echo/echo1/echo1.ino b/Station2-Echo/echo1/echo1.ino
new file mode 100644
index 0000000..ff09f4e
--- /dev/null
+++ b/Station2-Echo/echo1/echo1.ino
@@ -0,0 +1,219 @@
+#include <M5Unified.h> 
+#include <esp_now.h>
+#include <WiFi.h>
+#include <esp_wifi.h>
+#include <string.h>
+
+// --- CONFIGURATION: MAC ADDRESSES ---
+uint8_t matrixAddress[] = {0x4C, 0x75, 0x25, 0xAD, 0xB5, 0xBC};
+uint8_t core2Address[] = {0x2c, 0xBC, 0xBB, 0x82, 0x91, 0xA8}; 
+uint8_t stickc1Address[] = {0x00, 0x4B, 0x12, 0xC4, 0x2D, 0xF8};
+uint8_t stickc2Address[] = {0x00, 0x4b, 0x12, 0xC4, 0x35, 0x48};
+
+typedef struct struct_message {
+    char type[10];
+    char username[50]; 
+    int status;
+} struct_message;
+
+// ตัวแปร Global สำหรับเก็บข้อมูลที่ได้รับ
+struct_message incomingDataBuffer; 
+
+// --- SOUND SEQUENCER & STATE MACHINE VARIABLES ---
+const int shortBeepDuration = 200;
+const int longBeepDuration = 700;
+const int beepFreq = 1319; // ความถี่เสียง
+const int pauseDuration = 100; // ช่วงพักระหว่างเสียง
+
+enum SoundState { 
+    IDLE, BEEP1_START, BEEP1_WAIT, BEEP1_PAUSE,
+    BEEP2_START, BEEP2_WAIT, BEEP2_PAUSE,
+    BEEP3_START, BEEP3_WAIT, DONE 
+};
+SoundState currentSoundState = IDLE;
+unsigned long stateChangeTime = 0;
+
+// ------------------------------------
+// 📤 ESP-NOW FUNCTIONS (SENDER)
+// ------------------------------------
+
+void sendRequestToAll(const char* type, const char* username, int status) {
+    struct_message msg;
+    strcpy(msg.type, type);
+    strcpy(msg.username, username);
+    msg.status = status;
+
+    // ส่งไปยัง Core2, StickC1, StickC2
+    esp_now_send(core2Address, (uint8_t *) &msg, sizeof(msg));
+    esp_now_send(stickc1Address, (uint8_t *) &msg, sizeof(msg));
+    esp_now_send(stickc2Address, (uint8_t *) &msg, sizeof(msg));
+
+    // ส่งสัญญาณยืนยันกลับไปยัง Matrix
+    uint8_t matrixData = 3;
+    esp_now_send(matrixAddress, &matrixData, sizeof(matrixData));
+
+    Serial.println("[ESP-NOW] Sent Request to all devices.");
+}
+
+// ------------------------------------
+// 📥 ESP-NOW FUNCTIONS (RECEIVER)
+// ------------------------------------
+
+// **แก้ไข:** เปลี่ยนชื่อพารามิเตอร์ `incomingData` เป็น `dataPtr` เพื่อไม่ให้ชนกับตัวแปร Global
+void OnDataRecv(const esp_now_recv_info_t * info, const uint8_t *dataPtr, int len) {
+    if(len == sizeof(struct_message)){
+        // **แก้ไข:** 'memcy' เป็น 'memcpy' และใช้ตัวแปร Global 'incomingDataBuffer'
+        memcpy(&incomingDataBuffer, dataPtr, sizeof(struct_message));
+
+        Serial.print("\n[ESP-NOW] Received Request from: ");
+        for(int i=0; i<6; i++){
+            Serial.printf("%02X:", info->src_addr[i]);
+        }
+        Serial.println();
+        // **แก้ไข:** ใช้ incomingDataBuffer แทน incomingData
+        Serial.printf("Type: %s, User: %s, Status: %d\n", incomingDataBuffer.type, incomingDataBuffer.username, incomingDataBuffer.status);
+
+        // ตรวจสอบเงื่อนไขเพื่อเริ่มกระบวนการเสียง
+        if (strcmp(incomingDataBuffer.type, "TRIGGER") == 0 && currentSoundState == IDLE) {
+            currentSoundState = BEEP1_START; 
+            Serial.println("Sound Sequence Triggered by Matrix.");
+        }
+    }
+}
+
+// ------------------------------------
+// SETUP (รวม peer info และลบโค้ดซ้ำ)
+// ------------------------------------
+
+void setup() {
+    auto cfg = M5.config();
+    cfg.output_power = true; 
+    M5.begin(cfg); 
+    
+    M5.Speaker.begin();
+    M5.Speaker.setVolume(200); 
+
+    Serial.begin(115200);
+
+    M5.Display.fillScreen(0x0000FF); // ตั้งค่าสีเริ่มต้นเป็นสีน้ำเงิน
+    
+    WiFi.mode(WIFI_STA);
+    WiFi.disconnect();
+    Serial.println("\n--------------------------------");
+    Serial.print("MY MAC ADDRESS: ");
+    Serial.println(WiFi.macAddress());
+    Serial.println("--------------------------------");
+
+    esp_wifi_set_channel(1, WIFI_SECOND_CHAN_NONE); 
+
+    if (esp_now_init() != ESP_OK) {
+        Serial.println("ESR-NOW Init Failed");
+        delay(2000);
+        ESP.restart();
+    }
+
+    esp_now_register_recv_cb(OnDataRecv); 
+
+    // Helper function to add peers
+    auto addPeer = [](const uint8_t* addr, uint8_t channel) {
+        esp_now_peer_info_t peerInfo = {};
+        memcpy(peerInfo.peer_addr, addr, 6);
+        peerInfo.channel = channel; 
+        peerInfo.encrypt = false;
+        if (esp_now_add_peer(&peerInfo) != ESP_OK){
+            Serial.printf("Failed to add peer: %02X:%02X:%02X:%02X:%02X:%02X\n", addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
+        }
+    };
+    
+    // ตั้งค่า Peer ทั้งหมด (รวม Core2, Matrix, StickC1, StickC2)
+    addPeer(core2Address, 1);
+    addPeer(matrixAddress, 1);
+    addPeer(stickc1Address, 1);
+    addPeer(stickc2Address, 1);
+
+    Serial.println("Atom-Echo Setup Complete. Waiting for requests from Matrix...");
+}
+
+// ------------------------------------
+// LOOP (รวม Logic ทั้งหมดและลบโค้ดซ้ำ)
+// ------------------------------------
+
+void loop() {
+    M5.update(); 
+    unsigned long currentTime = millis();
+    
+    // 1. State Machine สำหรับการเล่นเสียงและส่ง Request (Non-blocking)
+    if (currentSoundState != IDLE) {
+        
+        switch (currentSoundState) {
+            case BEEP1_START:
+                M5.Display.fillScreen(0xFFFF00); // สีเหลือง
+                M5.Speaker.tone(beepFreq, shortBeepDuration);
+                stateChangeTime = currentTime;
+                currentSoundState = BEEP1_WAIT;
+                break;
+
+            case BEEP1_WAIT:
+                if (currentTime - stateChangeTime >= shortBeepDuration) {
+                    stateChangeTime = currentTime;
+                    currentSoundState = BEEP1_PAUSE;
+                }
+                break;
+            case BEEP1_PAUSE:
+                if (currentTime - stateChangeTime >= pauseDuration) {
+                    currentSoundState = BEEP2_START;
+                }
+                break;
+            
+            // --- BEEP 2 (เสียงสั้น) ---
+            case BEEP2_START:
+                M5.Speaker.tone(beepFreq, shortBeepDuration);
+                stateChangeTime = currentTime;
+                currentSoundState = BEEP2_WAIT;
+                break;
+            case BEEP2_WAIT:
+                if (currentTime - stateChangeTime >= shortBeepDuration) {
+                    stateChangeTime = currentTime;
+                    currentSoundState = BEEP2_PAUSE;
+                }
+                break;
+            case BEEP2_PAUSE:
+                if (currentTime - stateChangeTime >= pauseDuration) {
+                    currentSoundState = BEEP3_START;
+                }
+                break;
+
+            // --- BEEP 3 (เสียงยาว) ---
+            case BEEP3_START:
+                M5.Speaker.tone(beepFreq, longBeepDuration);
+                stateChangeTime = currentTime;
+                currentSoundState = BEEP3_WAIT;
+                break;
+                
+            case BEEP3_WAIT:
+                if (currentTime - stateChangeTime >= longBeepDuration) {
+                    currentSoundState = DONE;
+                }
+                break;
+
+            case DONE:
+                // 2. เมื่อเสียงทั้งหมดเล่นจบ ให้ส่ง Request ต่อไปยังอุปกรณ์อื่นๆ
+                M5.Display.fillScreen(0x00FF00); // สีเขียว: ส่ง Request สำเร็จ
+                sendRequestToAll("AUTH", "ECHO_ALERT", 1);
+                
+                // 3. กลับสู่สถานะ IDLE
+                currentSoundState = IDLE;
+                M5.Speaker.stop(); 
+                delay(2000); 
+                M5.Display.fillScreen(0x0000FF); // สีน้ำเงิน: กลับไปสถานะรอ
+                break;
+        }
+    }
+    
+    // 4. Manual Trigger (ใช้ปุ่มเป็นตัวกระตุ้นแทน Matrix)
+    // หากต้องการใช้ปุ่มเพื่อทดสอบการทำงาน ให้ใช้โค้ดส่วนนี้
+    if (M5.BtnA.wasPressed() && currentSoundState == IDLE) {
+        Serial.println("Manual Button Triggered! Starting process.");
+        currentSoundState = BEEP1_START; 
+    }
+}
\ No newline at end of file
diff --git a/Station2-Echo/include/README b/Station2-Echo/include/README
new file mode 100644
index 0000000..49819c0
--- /dev/null
+++ b/Station2-Echo/include/README
@@ -0,0 +1,37 @@
+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the convention is to give header files names that end with `.h'.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html
diff --git a/Station2-Echo/include/ShowcaseProtocol.h b/Station2-Echo/include/ShowcaseProtocol.h
new file mode 100644
index 0000000..ee8b0bf
--- /dev/null
+++ b/Station2-Echo/include/ShowcaseProtocol.h
@@ -0,0 +1,106 @@
+// File: ShowcaseProtocol.h
+// Project: StationX Showcase Network Protocol
+// Purpose: Shared message definitions and utility helpers used by all stations
+// Notes:
+//  - This header is intentionally simple and portable across ESP32-based stations.
+//  - Messages are packed to a fixed size to ensure stable behavior over ESP-NOW.
+//  - Non-functional, documentation-only changes made on 2025-12-06: clearer section comments.
+
+#ifndef SHOWCASE_PROTOCOL_H
+#define SHOWCASE_PROTOCOL_H
+
+#include <Arduino.h>
+#include <cstring>
+
+// ============================================
+// SYSTEM CONFIGURATION
+// ============================================
+#define BROADCAST_CHANNEL 1
+static const uint8_t BROADCAST_MAC[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
+#define MSG_MAX_LENGTH 64
+
+// ============================================
+// MESSAGE TYPES - Enum for type safety
+// ============================================
+enum MessageType : uint8_t {
+    MSG_IDENTITY_ASSIGN    = 1,   // St1 Core2 -> StickC
+    MSG_AUTH_REQUEST       = 2,   // St2 Matrix -> StickC
+    MSG_AUTH_SUCCESS       = 3,   // St2 Echo/Matrix -> StickC
+    MSG_EARN_COIN          = 4,   // St3 Paper -> StickC
+    MSG_SPEND_REQUEST      = 5,   // St4 Paper -> StickC
+    MSG_SPEND_CONFIRM      = 6,   // St4 Matrix -> StickC
+    MSG_RESET_ALL          = 99,  // Reset Button -> All
+    MSG_HEARTBEAT          = 100, // Keep-alive
+    MSG_BALANCE_UPDATE     = 101, // StickC -> All (broadcast balance)
+    MSG_ERROR              = 200  // Error message
+};
+
+// ============================================
+// DATA STRUCTURES - Fixed 64 bytes for stability
+// ============================================
+typedef struct {
+    uint8_t type;                  // MessageType enum
+    char username[32];             // Username (max 31 chars + null)
+    int32_t amount;                // Coin amount (int32 for safety)
+    char description[16];          // Activity/Menu name
+    uint8_t status;                // 0=pending, 1=success, 2=error
+    uint16_t checksum;             // Simple CRC16
+    uint32_t timestamp;            // Packet timestamp (anti-replay)
+    uint8_t padding[2];            // Padding to 64 bytes
+} __attribute__((packed)) ShowcaseMessage;
+
+// ============================================
+// COMMUNICATION CONSTANTS
+// ============================================
+#define STICKC_HTTP_PORT 8888
+#define CORE2_HTTP_PORT 8888
+#define MATRIX_HTTP_PORT 8888
+#define PAPER_HTTP_PORT 8888
+
+// IP addresses (192.168.4.x for AP mode)
+#define STICKC_IP "192.168.4.2"
+#define CORE2_IP "192.168.4.1"
+#define MATRIX_IP "192.168.4.3"
+#define PAPER_IP "192.168.4.4"
+
+// ============================================
+// UTILITY FUNCTIONS
+// ============================================
+static inline uint16_t calculateChecksum(const ShowcaseMessage &msg) {
+    uint16_t crc = 0xFFFF;
+    const uint8_t *data = (const uint8_t *)&msg;
+    for (size_t i = 0; i < sizeof(msg) - 2; i++) {
+        crc ^= data[i];
+        for (int j = 0; j < 8; j++) {
+            crc = (crc >> 1) ^ (0xA001 & (-(crc & 1)));
+        }
+    }
+    return crc;
+}
+
+static inline bool verifyChecksum(const ShowcaseMessage &msg) {
+    return calculateChecksum(msg) == msg.checksum;
+}
+
+static inline void setChecksum(ShowcaseMessage &msg) {
+    msg.checksum = calculateChecksum(msg);
+}
+
+// Create a properly formatted message
+static inline ShowcaseMessage createMessage(uint8_t type, const char *username = "",
+                                            int32_t amount = 0, const char *description = "") {
+    ShowcaseMessage msg;
+    memset(&msg, 0, sizeof(msg));
+    msg.type = type;
+    msg.status = 0;  // pending
+    msg.timestamp = millis();
+    
+    if (username) strncpy(msg.username, username, 31);
+    if (description) strncpy(msg.description, description, 15);
+    msg.amount = amount;
+    
+    setChecksum(msg);
+    return msg;
+}
+
+#endif
diff --git a/Station2-Echo/lib/ProjectShared/Participant.h b/Station2-Echo/lib/ProjectShared/Participant.h
new file mode 100644
index 0000000..ba1c302
--- /dev/null
+++ b/Station2-Echo/lib/ProjectShared/Participant.h
@@ -0,0 +1,49 @@
+// Participant.h: Data Structure สำหรับจัดการข้อมูลผู้เข้าร่วม (Username, Status, CCoin)
+
+#ifndef PARTICIPANT_H
+#define PARTICIPANT_H
+
+#include <Arduino.h>
+
+class Participant {
+public:
+    String Username;
+    bool isAuthenticated;
+    int CCoin_Balance;
+    String alertText;
+
+    Participant() {
+        // ค่าเริ่มต้นเมื่อเริ่มต้นระบบหรือทำการ Reset
+        reset();
+    }
+
+    void reset() {
+        Username = "";
+        isAuthenticated = false;
+        CCoin_Balance = 0;
+        alertText = "-";
+    }
+
+    String getAuthStatus() {
+        return isAuthenticated ? "✓" : "X";
+    }
+
+    // ฟังก์ชันสำหรับส่งข้อมูลในรูปแบบ JSON
+    String toJSON() {
+        String json = "{";
+        json += "\"username\": \"" + Username + "\",";
+        json += "\"isAuthenticated\": " + String(isAuthenticated ? "true" : "false") + ",";
+        json += "\"ccoin_balance\": " + String(CCoin_Balance) + ",";
+        json += "\"alert_text\": \"" + alertText + "\"";
+        json += "}";
+        return json;
+    }
+
+    // ฟังก์ชันสำหรับอัปเดตข้อมูลจาก JSON (ใช้เมื่อรับ Request)
+    void updateFromJSON(const String& json) {
+        // ในโปรเจกต์นี้จะทำการแยก Parser JSON ในแต่ละอุปกรณ์เพื่อให้ง่ายต่อการจัดการ
+        // แต่โครงสร้างนี้ช่วยให้รู้ว่ามีข้อมูลอะไรบ้าง
+    }
+};
+
+#endif // PARTICIPANT_H
\ No newline at end of file
diff --git a/Station2-Echo/lib/ProjectShared/config.h b/Station2-Echo/lib/ProjectShared/config.h
new file mode 100644
index 0000000..fcf1f94
--- /dev/null
+++ b/Station2-Echo/lib/ProjectShared/config.h
@@ -0,0 +1,37 @@
+#ifndef CONFIG_H
+#define CONFIG_H
+
+#include <Arduino.h>
+
+// --- SoftAP Configuration (Hosted by Station 1) ---
+const char* AP_SSID = "Web3_Showcase_AP";
+const char* AP_PASSWORD = NULL; // Open network for easy Captive Portal
+
+// --- IP Address Mapping ---
+// Gateway (Station 1) must be x.x.x.1
+IPAddress IP_STATION1_AP(192, 168, 4, 1);     // Core2: Identity & AP
+IPAddress IP_STATION2_MON(192, 168, 4, 2);    // Core2: Auth Monitor
+IPAddress IP_RESET_MON(192, 168, 4, 3);       // Core Basic: System Monitor & Reset
+
+IPAddress IP_STICKC(192, 168, 4, 10);         // Wearable
+IPAddress IP_ATOM_MATRIX(192, 168, 4, 20);    // S2/S4 Sensor
+IPAddress IP_ATOM_ECHO(192, 168, 4, 30);      // Sound
+IPAddress IP_PAPER_S3(192, 168, 4, 40);       // Earn
+IPAddress IP_PAPER_S4(192, 168, 4, 50);       // Spend
+
+IPAddress NETMASK(255, 255, 255, 0);
+
+// --- Endpoints ---
+#define ENDPOINT_HEARTBEAT "/heartbeat"
+#define ENDPOINT_SET_USER "/set_user"
+#define ENDPOINT_SET_AUTH "/set_auth"
+#define ENDPOINT_RESET_GLOBAL "/reset_global"
+
+// [เพิ่มเติม] เพิ่ม Endpoints สำหรับ Earn และ Spend ที่หายไป
+#define ENDPOINT_EARN_COIN "/earn_coin"
+#define ENDPOINT_SPEND_COIN "/spend_coin"
+
+// [เพิ่มเติม] Endpoints สำหรับ Atom Matrix (เผื่อใช้)
+#define ENDPOINT_GET_ORDER "/get_order"
+
+#endif // CONFIG_H
\ No newline at end of file
diff --git a/Station2-Echo/lib/README b/Station2-Echo/lib/README
new file mode 100644
index 0000000..9379397
--- /dev/null
+++ b/Station2-Echo/lib/README
@@ -0,0 +1,46 @@
+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into the executable file.
+
+The source code of each library should be placed in a separate directory
+("lib/your_library_name/[Code]").
+
+For example, see the structure of the following example libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional. for custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+Example contents of `src/main.c` using Foo and Bar:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+The PlatformIO Library Dependency Finder will find automatically dependent
+libraries by scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html
diff --git a/Station2-Echo/platformio.ini b/Station2-Echo/platformio.ini
new file mode 100644
index 0000000..b75407e
--- /dev/null
+++ b/Station2-Echo/platformio.ini
@@ -0,0 +1,18 @@
+; PlatformIO Project Configuration File
+; Station 2: Atom Echo Audio Controller
+
+[env:m5stack-atom]
+platform = espressif32
+board = m5stack-atom
+framework = arduino
+monitor_speed = 115200
+upload_speed = 1500000
+
+lib_deps = 
+    m5stack/M5Unified @ ^0.2.11
+    bblanchon/ArduinoJson @ ^6.21.3
+
+build_flags = 
+    -DCORE_DEBUG_LEVEL=0
+
+board_build.partitions = min_spiffs.csv
diff --git a/Station2-Echo/src/main.cpp b/Station2-Echo/src/main.cpp
new file mode 100644
index 0000000..f8f26b5
--- /dev/null
+++ b/Station2-Echo/src/main.cpp
@@ -0,0 +1,118 @@
+// Audio_AtomEcho.cpp: โค้ดสำหรับ M5-Atom Echo (Audio Beacons/Client)
+// รับ Request เพื่อเล่นเสียงแจ้งเตือนการยืนยันตัวตนและธุรกรรมสำเร็จ
+
+#include <M5Atom.h>
+#include <WiFi.h>
+#include <ESPAsyncWebServer.h>
+#include "config.h"
+
+AsyncWebServer server(80);
+
+// --- ฟังก์ชันการเล่นเสียง ---
+
+void playAuthSound() {
+    Serial.println("Playing Authentication Sound...");
+    // 14. เสียงแจ้งเตือนการยืนยันตัวตน: (Beep สั้น 2 ครั้ง เว้น 1 วิ, Beep ยาว 1 วินาที)
+    
+    // Beep สั้น 1
+    M5.Speaker.tone(1000, 100); 
+    delay(100);
+    M5.Speaker.end();
+    
+    delay(1000); // เว้น 1 วิ
+    
+    // Beep สั้น 2
+    M5.Speaker.tone(1000, 100);
+    delay(100);
+    M5.Speaker.end();
+    
+    delay(1000); // เว้น 1 วิ
+    
+    // Beep ยาว 1
+    M5.Speaker.tone(1500, 1000); // 1 วินาที
+    delay(1000);
+    M5.Speaker.end();
+    
+    Serial.println("Auth sound finished. Sending success signal.");
+    
+    // 15. ส่ง Request แจ้งสถานะสำเร็จไปยัง Core2, StickC-Plus2
+    // ใช้ Atom Echo เป็นตัวส่งสัญญาณความสำเร็จของกระบวนการ
+    
+    // Note: Atom Echo does not have an easy way to send HTTP requests with M5Atom library,
+    // For simplicity and stability, we assume it can send the post request. 
+    // In a real environment, this logic would live on the Atom Matrix which has more resources.
+    // However, following the flow: Atom Echo -> Core2, StickC-Plus2
+    
+    HTTPClient http;
+    // Notify Core2 (Monitor)
+    http.begin(String("http://") + IP_CORE2.toString() + ENDPOINT_SET_AUTH);
+    http.POST("{}");
+    http.end();
+    
+    // Notify StickC-Plus2 (Wearable)
+    http.begin(String("http://") + IP_STICKC.toString() + ENDPOINT_SET_AUTH);
+    http.POST("{}");
+    http.end();
+}
+
+void playTxSuccessSound() {
+    Serial.println("Playing Transaction Success Sound...");
+    // 30. เล่นเสียงแจ้งเตือนธุรกรรมสำเร็จ (ใช้ Beep สั้น 3 ครั้ง)
+    M5.Speaker.tone(1200, 50); delay(50); M5.Speaker.end();
+    delay(50);
+    M5.Speaker.tone(1200, 50); delay(50); M5.Speaker.end();
+    delay(50);
+    M5.Speaker.tone(1500, 100); delay(100); M5.Speaker.end();
+}
+
+// --- ฟังก์ชัน HTTP Server Handlers ---
+
+void handlePlayAuth(AsyncWebServerRequest *request) {
+    playAuthSound();
+    request->send(200, "text/plain", "Auth sound playing.");
+}
+
+void handlePlayTx(AsyncWebServerRequest *request) {
+    playTxSuccessSound();
+    request->send(200, "text/plain", "Tx sound playing.");
+}
+
+void handleSystemReset(AsyncWebServerRequest *request) {
+    M5.Speaker.end(); // หยุดเสียงที่กำลังเล่น
+    request->send(200, "text/plain", "Echo reset complete.");
+}
+
+// --- Setup Function ---
+void setup() {
+    M5.begin(true, false, true); // Atom Echo: Init, Power=false, Serial=true
+    Serial.begin(115200);
+
+    // กำหนด Static IP
+    WiFi.config(IP_ATOM_ECHO, IP_CORE2, IPAddress(255, 255, 255, 0));
+    WiFi.begin(AP_SSID, AP_PASSWORD);
+
+    Serial.println("Connecting to AP...");
+    while (WiFi.status() != WL_CONNECTED) {
+        delay(500);
+        Serial.print(".");
+    }
+
+    Serial.print("\nConnected to AP. IP: ");
+    Serial.println(WiFi.localIP());
+
+    // ตั้งค่า Server Endpoints
+    server.on(ENDPOINT_PLAY_AUTH, HTTP_POST, handlePlayAuth);
+    server.on(ENDPOINT_PLAY_TX_SUCCESS, HTTP_POST, handlePlayTx);
+    server.on(ENDPOINT_RESET_USER, HTTP_POST, handleSystemReset);
+
+    server.begin();
+    Serial.println("HTTP server started on Atom Echo.");
+
+    M5.dis.setLed(0, 0x00FF00); // Green light on successful connection
+}
+
+void loop() {
+    M5.update();
+    // Speaker is handled in the callback functions
+    delay(100);
+}
\ No newline at end of file
diff --git a/Station2-Echo/test/README b/Station2-Echo/test/README
new file mode 100644
index 0000000..9b1e87b
--- /dev/null
+++ b/Station2-Echo/test/README
@@ -0,0 +1,11 @@
+
+This directory is intended for PlatformIO Test Runner and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/en/latest/advanced/unit-testing/index.html
diff --git a/Station2-Matrix/include/ProjectConfig.h b/Station2-Matrix/include/ProjectConfig.h
new file mode 100644
index 0000000..9daf3a8
--- /dev/null
+++ b/Station2-Matrix/include/ProjectConfig.h
@@ -0,0 +1,38 @@
+#ifndef PROJECT_CONFIG_H
+#define PROJECT_CONFIG_H
+
+#include <IPAddress.h>
+
+// --- WiFi Settings ---
+// Core2 จะเป็นคนสร้างวงนี้ขึ้นมา
+const char* WIFI_SSID = "Web3_Showcase";
+const char* WIFI_PASS = "12345678";
+
+// --- Static IP Map (Fixed for Stability) ---
+// Gateway (Core2) - Station 1 Host
+const IPAddress IP_CORE2(192, 168, 4, 1);
+
+// Wearable (User) - Station 1 Client
+const IPAddress IP_STICKC(192, 168, 4, 2);
+
+// Station 2 (Auth)
+const IPAddress IP_MATRIX_ST2(192, 168, 4, 3);
+
+// Station 3 (Earn)
+const IPAddress IP_PAPER_ST3(192, 168, 4, 5);
+
+// Station 4 (Spend)
+const IPAddress IP_PAPER_ST4(192, 168, 4, 6);   // Menu
+const IPAddress IP_MATRIX_ST4(192, 168, 4, 7);  // Payment Terminal
+
+// Common & Admin
+const IPAddress IP_ECHO(192, 168, 4, 4);        // Sound Server
+const IPAddress IP_RESET(192, 168, 4, 8);       // Reset Button
+
+// Ports
+const int HTTP_PORT = 80;
+
+// BLE Config
+const char* BLE_DEVICE_NAME = "M5_Showcase_User";
+
+#endif
\ No newline at end of file
diff --git a/Station2-Matrix/include/README b/Station2-Matrix/include/README
new file mode 100644
index 0000000..49819c0
--- /dev/null
+++ b/Station2-Matrix/include/README
@@ -0,0 +1,37 @@
+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the convention is to give header files names that end with `.h'.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html
diff --git a/Station2-Matrix/include/ShowcaseProtocol.h b/Station2-Matrix/include/ShowcaseProtocol.h
new file mode 100644
index 0000000..ee8b0bf
--- /dev/null
+++ b/Station2-Matrix/include/ShowcaseProtocol.h
@@ -0,0 +1,106 @@
+// File: ShowcaseProtocol.h
+// Project: StationX Showcase Network Protocol
+// Purpose: Shared message definitions and utility helpers used by all stations
+// Notes:
+//  - This header is intentionally simple and portable across ESP32-based stations.
+//  - Messages are packed to a fixed size to ensure stable behavior over ESP-NOW.
+//  - Non-functional, documentation-only changes made on 2025-12-06: clearer section comments.
+
+#ifndef SHOWCASE_PROTOCOL_H
+#define SHOWCASE_PROTOCOL_H
+
+#include <Arduino.h>
+#include <cstring>
+
+// ============================================
+// SYSTEM CONFIGURATION
+// ============================================
+#define BROADCAST_CHANNEL 1
+static const uint8_t BROADCAST_MAC[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
+#define MSG_MAX_LENGTH 64
+
+// ============================================
+// MESSAGE TYPES - Enum for type safety
+// ============================================
+enum MessageType : uint8_t {
+    MSG_IDENTITY_ASSIGN    = 1,   // St1 Core2 -> StickC
+    MSG_AUTH_REQUEST       = 2,   // St2 Matrix -> StickC
+    MSG_AUTH_SUCCESS       = 3,   // St2 Echo/Matrix -> StickC
+    MSG_EARN_COIN          = 4,   // St3 Paper -> StickC
+    MSG_SPEND_REQUEST      = 5,   // St4 Paper -> StickC
+    MSG_SPEND_CONFIRM      = 6,   // St4 Matrix -> StickC
+    MSG_RESET_ALL          = 99,  // Reset Button -> All
+    MSG_HEARTBEAT          = 100, // Keep-alive
+    MSG_BALANCE_UPDATE     = 101, // StickC -> All (broadcast balance)
+    MSG_ERROR              = 200  // Error message
+};
+
+// ============================================
+// DATA STRUCTURES - Fixed 64 bytes for stability
+// ============================================
+typedef struct {
+    uint8_t type;                  // MessageType enum
+    char username[32];             // Username (max 31 chars + null)
+    int32_t amount;                // Coin amount (int32 for safety)
+    char description[16];          // Activity/Menu name
+    uint8_t status;                // 0=pending, 1=success, 2=error
+    uint16_t checksum;             // Simple CRC16
+    uint32_t timestamp;            // Packet timestamp (anti-replay)
+    uint8_t padding[2];            // Padding to 64 bytes
+} __attribute__((packed)) ShowcaseMessage;
+
+// ============================================
+// COMMUNICATION CONSTANTS
+// ============================================
+#define STICKC_HTTP_PORT 8888
+#define CORE2_HTTP_PORT 8888
+#define MATRIX_HTTP_PORT 8888
+#define PAPER_HTTP_PORT 8888
+
+// IP addresses (192.168.4.x for AP mode)
+#define STICKC_IP "192.168.4.2"
+#define CORE2_IP "192.168.4.1"
+#define MATRIX_IP "192.168.4.3"
+#define PAPER_IP "192.168.4.4"
+
+// ============================================
+// UTILITY FUNCTIONS
+// ============================================
+static inline uint16_t calculateChecksum(const ShowcaseMessage &msg) {
+    uint16_t crc = 0xFFFF;
+    const uint8_t *data = (const uint8_t *)&msg;
+    for (size_t i = 0; i < sizeof(msg) - 2; i++) {
+        crc ^= data[i];
+        for (int j = 0; j < 8; j++) {
+            crc = (crc >> 1) ^ (0xA001 & (-(crc & 1)));
+        }
+    }
+    return crc;
+}
+
+static inline bool verifyChecksum(const ShowcaseMessage &msg) {
+    return calculateChecksum(msg) == msg.checksum;
+}
+
+static inline void setChecksum(ShowcaseMessage &msg) {
+    msg.checksum = calculateChecksum(msg);
+}
+
+// Create a properly formatted message
+static inline ShowcaseMessage createMessage(uint8_t type, const char *username = "",
+                                            int32_t amount = 0, const char *description = "") {
+    ShowcaseMessage msg;
+    memset(&msg, 0, sizeof(msg));
+    msg.type = type;
+    msg.status = 0;  // pending
+    msg.timestamp = millis();
+    
+    if (username) strncpy(msg.username, username, 31);
+    if (description) strncpy(msg.description, description, 15);
+    msg.amount = amount;
+    
+    setChecksum(msg);
+    return msg;
+}
+
+#endif
diff --git a/Station2-Matrix/lib/ProjectShared/Participant.h b/Station2-Matrix/lib/ProjectShared/Participant.h
new file mode 100644
index 0000000..ba1c302
--- /dev/null
+++ b/Station2-Matrix/lib/ProjectShared/Participant.h
@@ -0,0 +1,49 @@
+// Participant.h: Data Structure สำหรับจัดการข้อมูลผู้เข้าร่วม (Username, Status, CCoin)
+
+#ifndef PARTICIPANT_H
+#define PARTICIPANT_H
+
+#include <Arduino.h>
+
+class Participant {
+public:
+    String Username;
+    bool isAuthenticated;
+    int CCoin_Balance;
+    String alertText;
+
+    Participant() {
+        // ค่าเริ่มต้นเมื่อเริ่มต้นระบบหรือทำการ Reset
+        reset();
+    }
+
+    void reset() {
+        Username = "";
+        isAuthenticated = false;
+        CCoin_Balance = 0;
+        alertText = "-";
+    }
+
+    String getAuthStatus() {
+        return isAuthenticated ? "✓" : "X";
+    }
+
+    // ฟังก์ชันสำหรับส่งข้อมูลในรูปแบบ JSON
+    String toJSON() {
+        String json = "{";
+        json += "\"username\": \"" + Username + "\",";
+        json += "\"isAuthenticated\": " + String(isAuthenticated ? "true" : "false") + ",";
+        json += "\"ccoin_balance\": " + String(CCoin_Balance) + ",";
+        json += "\"alert_text\": \"" + alertText + "\"";
+        json += "}";
+        return json;
+    }
+
+    // ฟังก์ชันสำหรับอัปเดตข้อมูลจาก JSON (ใช้เมื่อรับ Request)
+    void updateFromJSON(const String& json) {
+        // ในโปรเจกต์นี้จะทำการแยก Parser JSON ในแต่ละอุปกรณ์เพื่อให้ง่ายต่อการจัดการ
+        // แต่โครงสร้างนี้ช่วยให้รู้ว่ามีข้อมูลอะไรบ้าง
+    }
+};
+
+#endif // PARTICIPANT_H
\ No newline at end of file
diff --git a/Station2-Matrix/lib/ProjectShared/config.h b/Station2-Matrix/lib/ProjectShared/config.h
new file mode 100644
index 0000000..fcf1f94
--- /dev/null
+++ b/Station2-Matrix/lib/ProjectShared/config.h
@@ -0,0 +1,37 @@
+#ifndef CONFIG_H
+#define CONFIG_H
+
+#include <Arduino.h>
+
+// --- SoftAP Configuration (Hosted by Station 1) ---
+const char* AP_SSID = "Web3_Showcase_AP";
+const char* AP_PASSWORD = NULL; // Open network for easy Captive Portal
+
+// --- IP Address Mapping ---
+// Gateway (Station 1) must be x.x.x.1
+IPAddress IP_STATION1_AP(192, 168, 4, 1);     // Core2: Identity & AP
+IPAddress IP_STATION2_MON(192, 168, 4, 2);    // Core2: Auth Monitor
+IPAddress IP_RESET_MON(192, 168, 4, 3);       // Core Basic: System Monitor & Reset
+
+IPAddress IP_STICKC(192, 168, 4, 10);         // Wearable
+IPAddress IP_ATOM_MATRIX(192, 168, 4, 20);    // S2/S4 Sensor
+IPAddress IP_ATOM_ECHO(192, 168, 4, 30);      // Sound
+IPAddress IP_PAPER_S3(192, 168, 4, 40);       // Earn
+IPAddress IP_PAPER_S4(192, 168, 4, 50);       // Spend
+
+IPAddress NETMASK(255, 255, 255, 0);
+
+// --- Endpoints ---
+#define ENDPOINT_HEARTBEAT "/heartbeat"
+#define ENDPOINT_SET_USER "/set_user"
+#define ENDPOINT_SET_AUTH "/set_auth"
+#define ENDPOINT_RESET_GLOBAL "/reset_global"
+
+// [เพิ่มเติม] เพิ่ม Endpoints สำหรับ Earn และ Spend ที่หายไป
+#define ENDPOINT_EARN_COIN "/earn_coin"
+#define ENDPOINT_SPEND_COIN "/spend_coin"
+
+// [เพิ่มเติม] Endpoints สำหรับ Atom Matrix (เผื่อใช้)
+#define ENDPOINT_GET_ORDER "/get_order"
+
+#endif // CONFIG_H
\ No newline at end of file
diff --git a/Station2-Matrix/lib/README b/Station2-Matrix/lib/README
new file mode 100644
index 0000000..9379397
--- /dev/null
+++ b/Station2-Matrix/lib/README
@@ -0,0 +1,46 @@
+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into the executable file.
+
+The source code of each library should be placed in a separate directory
+("lib/your_library_name/[Code]").
+
+For example, see the structure of the following example libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional. for custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+Example contents of `src/main.c` using Foo and Bar:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+The PlatformIO Library Dependency Finder will find automatically dependent
+libraries by scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html
diff --git a/Station2-Matrix/platformio.ini b/Station2-Matrix/platformio.ini
new file mode 100644
index 0000000..f77929e
--- /dev/null
+++ b/Station2-Matrix/platformio.ini
@@ -0,0 +1,14 @@
+[env:m5stack-atom]
+platform = espressif32
+board = m5stack-atom
+framework = arduino
+monitor_speed = 115200
+upload_speed = 1500000
+
+; [สำคัญ] ชี้ไปที่โฟลเดอร์ lib นอกโปรเจกต์
+lib_extra_dirs = ../lib 
+
+lib_deps = 
+    m5stack/M5Atom @ ^0.1.2
+    fastled/FastLED @ ^3.6.0 ; จำเป็นสำหรับไฟ LED Matrix
+    bblanchon/ArduinoJson @ ^7.0.4
\ No newline at end of file
diff --git a/Station2-Matrix/src/main(matrix-2).cpp b/Station2-Matrix/src/main(matrix-2).cpp
new file mode 100644
index 0000000..cba726a
--- /dev/null
+++ b/Station2-Matrix/src/main(matrix-2).cpp
@@ -0,0 +1,150 @@
+#include <M5Atom.h>
+#include <BLEDevice.h>
+#include <BLEUtils.h>
+#include <BLEScan.h>
+#include <BLEAdvertisedDevice.h>
+#include <esp_now.h>
+#include <WiFi.h>
+#include <esp_wifi.h>
+#include <HTTPClient.h>
+
+// --- CONFIGURATION ---
+const char *SSID = "Web3Showcase_AP";
+const char *PASSWORD = "12345678";
+
+// IP ของ StickC
+const char* STICKC_IP = "192.168.4.2"; 
+const int STICKC_PORT = 88;
+
+// MAC Address ของ Atom Echo
+uint8_t echoAddress[] = {0x90, 0x15, 0x06, 0xFD, 0xF2, 0xF8}; 
+
+const int RSSI_THRESHOLD = -55;
+
+BLEUUID targetUUID = BLEUUID("1234");
+int checkIcon[] = { 15, 21, 17, 13, 9 };
+
+BLEScan* pBLEScan;
+bool isVerified = false;
+
+// --- FUNCTIONS ---
+
+void sendAuthStartToStickC() {
+    if(WiFi.status() == WL_CONNECTED) {
+        HTTPClient http;
+        String myMac = WiFi.macAddress();
+        String url = "http://" + String(STICKC_IP) + ":" + String(STICKC_PORT) + "/auth_start?sender_mac=" + myMac;
+        
+        http.begin(url);
+        http.setConnectTimeout(1000);
+        int httpCode = http.GET();
+        
+        if (httpCode > 0) {
+            Serial.printf("[HTTP] Sent Auth Start to StickC (Code: %d)\n", httpCode);
+        } else {
+            Serial.printf("[HTTP] Failed to send to StickC (Error: %s)\n", http.errorToString(httpCode).c_str());
+        }
+        http.end();
+    } else {
+        Serial.println("[HTTP] WiFi not connected!");
+    }
+}
+
+void OnDataRecv(const uint8_t * mac, const uint8_t *incomingData, int len) {
+    if (len > 0 && *incomingData == 2) {
+        isVerified = true;
+        Serial.println("[ESP-NOW] Received Confirmation from Echo");
+    }
+}
+
+void setup() {
+    M5.begin(true, false, true); 
+    delay(10);
+    
+    // 1. Connect WiFi
+    WiFi.mode(WIFI_STA);
+    WiFi.begin(SSID, PASSWORD);
+    
+    M5.dis.fillpix(0xFF0000); 
+    Serial.print("Connecting to WiFi");
+    while (WiFi.status() != WL_CONNECTED) {
+        delay(500);
+        Serial.print(".");
+    }
+    Serial.println("\nWiFi Connected!");
+    
+    // 2. Init ESP-NOW
+    if (esp_now_init() != ESP_OK) {
+        Serial.println("Error initializing ESP-NOW");
+        return;
+    }
+    
+    esp_now_register_recv_cb(OnDataRecv);
+
+    // Register Echo Peer
+    esp_now_peer_info_t peerInfo;
+    memset(&peerInfo, 0, sizeof(peerInfo));
+    memcpy(peerInfo.peer_addr, echoAddress, 6);
+    peerInfo.channel = 0; 
+    peerInfo.encrypt = false;
+    if (esp_now_add_peer(&peerInfo) != ESP_OK){
+        Serial.println("Failed to add peer");
+    }
+
+    // 3. Init BLE
+    BLEDevice::init("");
+    pBLEScan = BLEDevice::getScan(); 
+    pBLEScan->setActiveScan(true); 
+    pBLEScan->setInterval(100);
+    pBLEScan->setWindow(99);
+    
+    M5.dis.fillpix(0x0000FF); 
+    Serial.println("System Ready.");
+}
+
+void loop() {
+    M5.update();
+    
+    if (isVerified) {
+        M5.dis.clear();
+        for (int i = 0; i < 5; i++) M5.dis.drawpix(checkIcon[i], 0x00FF00); 
+        Serial.println("Task Complete.");
+        while(true) { delay(1000); } 
+    }
+
+    // 
+    BLEScanResults foundDevices = pBLEScan->start(1, false); 
+    bool foundTarget = false;
+    
+    // ใช้ . แทน -> เพราะ foundDevices เป็น Object แล้ว
+    for (int i = 0; i < foundDevices.getCount(); i++) {
+        BLEAdvertisedDevice device = foundDevices.getDevice(i);
+        if (device.haveServiceUUID() && device.isAdvertisingService(targetUUID)) {
+             int rssi = device.getRSSI();
+             if (rssi > RSSI_THRESHOLD) {
+                foundTarget = true;
+                Serial.printf("Found StickC! RSSI: %d\n", rssi);
+             }
+             break;
+        }
+    }
+    
+    if (foundTarget) {
+        Serial.println("Target in Range!");
+        M5.dis.fillpix(0xFFFF00); 
+
+        // A. ส่งเสียงไป Echo
+        uint8_t data = 1; 
+        esp_now_send(echoAddress, &data, sizeof(data));
+        
+        // B. ส่ง HTTP ไป StickC
+        sendAuthStartToStickC();
+        
+        delay(500); 
+    } 
+    else {
+        M5.dis.fillpix(0x0000FF); 
+    }
+
+    pBLEScan->clearResults(); 
+}
\ No newline at end of file
diff --git a/Station2-Matrix/src/main.cpp b/Station2-Matrix/src/main.cpp
new file mode 100644
index 0000000..36a4cd6
--- /dev/null
+++ b/Station2-Matrix/src/main.cpp
@@ -0,0 +1,88 @@
+#include <M5Atom.h>
+#include <WiFi.h>
+#include <HTTPClient.h>
+#include <ESPAsyncWebServer.h>
+#include "config.h"
+
+AsyncWebServer server(80);
+bool isAuthInProgress = false;
+
+// ฟังก์ชันเปลี่ยนสีไฟ (5x5 Matrix)
+void showColor(uint32_t color) {
+    for (int i = 0; i < 25; i++) M5.dis.drawpix(i, color);
+}
+
+// ฟังก์ชันเริ่มกระบวนการ Auth
+void triggerAuth() {
+    if (isAuthInProgress) return;
+    isAuthInProgress = true;
+    
+    Serial.println("Triggering Auth...");
+    showColor(0x0000FF); // สีน้ำเงิน (Processing)
+
+    HTTPClient http;
+    http.setTimeout(2000);
+
+    // 1. สั่ง Atom Echo เล่นเสียง
+    http.begin("http://" + IP_ATOM_ECHO.toString() + ENDPOINT_PLAY_AUTH);
+    http.POST("{}");
+    http.end();
+
+    // 2. สั่ง StickC ให้เปลี่ยนสถานะ
+    http.begin("http://" + IP_STICKC.toString() + ENDPOINT_SET_AUTH);
+    http.POST("{}");
+    http.end();
+
+    // 3. สั่ง Core2 Monitor ให้โชว์ Success
+    http.begin("http://" + IP_STATION2_MON.toString() + ENDPOINT_SET_AUTH);
+    http.POST("{}");
+    http.end();
+
+    delay(1000);
+    showColor(0x00FF00); // สีเขียว (Success)
+    delay(2000);
+    showColor(0x000000); // ปิดไฟ
+    isAuthInProgress = false;
+}
+
+void setup() {
+    M5.begin(true, false, true); // Init Atom (LED=Enable, Serial=Enable)
+    WiFi.begin(AP_SSID, AP_PASSWORD);
+    
+    // รอเชื่อมต่อ WiFi (ไฟสีแดงกะพริบ)
+    while (WiFi.status() != WL_CONNECTED) {
+        M5.dis.drawpix(0, 0xFF0000); delay(200);
+        M5.dis.drawpix(0, 0x000000); delay(200);
+    }
+    // เชื่อมต่อแล้ว (ไฟสีเขียวแวบหนึ่ง)
+    WiFi.config(IP_ATOM_MATRIX_S2, IP_STATION1_AP, NETMASK, IP_STATION1_AP);
+    M5.dis.drawpix(0, 0x00FF00); delay(1000); showColor(0x000000);
+
+    server.on(ENDPOINT_HEARTBEAT, HTTP_GET, [](AsyncWebServerRequest *r){ r->send(200); });
+    server.on(ENDPOINT_RESET_GLOBAL, HTTP_POST, [](AsyncWebServerRequest *r){
+        showColor(0x000000); // Reset = ปิดไฟ
+        isAuthInProgress = false;
+        r->send(200);
+    });
+    server.begin();
+}
+
+void loop() {
+    M5.update();
+    
+    // 1. Manual Trigger: กดปุ่มหน้าจอเพื่อ Auth (เผื่อ RSSI ไม่แม่น)
+    if (M5.Btn.wasPressed()) {
+        triggerAuth();
+    }
+
+    // 2. RSSI Trigger: ตรวจจับสัญญาณ StickC
+    static unsigned long lastScan = 0;
+    if (millis() - lastScan > 3000 && !isAuthInProgress) { // Scan ทุก 3 วิ
+        int n = WiFi.scanNetworks();
+        for (int i = 0; i < n; ++i) {
+            // เช็คว่าเจอ Mac Address หรือ SSID ของ StickC หรือไม่ 
+            // (ใน SoftAP Mode Client จะไม่ปล่อย SSID, ดังนั้นใช้ปุ่มกดจะเสถียรกว่ามากสำหรับงาน Showcase)
+        }
+        lastScan = millis();
+    }
+}
\ No newline at end of file
diff --git a/Station2-Matrix/test/README b/Station2-Matrix/test/README
new file mode 100644
index 0000000..9b1e87b
--- /dev/null
+++ b/Station2-Matrix/test/README
@@ -0,0 +1,11 @@
+
+This directory is intended for PlatformIO Test Runner and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/en/latest/advanced/unit-testing/index.html
diff --git a/m5stickplus2/m5stickplus2.ino b/m5stickplus2/m5stickplus2.ino
new file mode 100644
index 0000000..abc6b1a
--- /dev/null
+++ b/m5stickplus2/m5stickplus2.ino
@@ -0,0 +1,112 @@
+#include <M5Unified.h>
+#include <WiFi.h>
+#include <AsyncTCP.h>
+#include <ESPAsyncWebServer.h>
+
+// --- CENTRALIZED CONFIGURATION ---
+const char *SSID_AP = "Web3Showcase_AP";
+const char *PASSWORD_AP = "12345678";
+const int LOCAL_PORT = 88; // Port ที่ StickC รอรับ Request
+const IPAddress local_IP(192,168,4,2);
+const IPAddress gateway(192,168,4,1);
+const IPAddress subnet(255,255,255,0);
+
+AsyncWebServer stickCServer(LOCAL_PORT);
+String currentUsername = "Not Registered";
+String authenStatus = "X";
+int ccoin = 0;
+String alertText = "Waiting for Identity...";
+
+// --- UI DATA ---
+// ตัวแปรสำหรับเก็บ MAC Address ของตัวเอง (ใช้ในการอ้างอิงสำหรับ Atom Matrix ใน Station 2)
+String myMacAddress = "";
+
+// --- CORE FUNCTIONS ---
+
+// 9a. แสดงข้อมูล Username และสถานะของผู้เข้าร่วมผ่านทางหน้าจอ
+void updateDisplay() {
+    M5.Lcd.fillScreen(BLACK);
+    M5.Lcd.setTextDatum(top_left);
+    M5.Lcd.setFont(&fonts::Font2);
+    
+    M5.Lcd.setCursor(5, 5);
+    M5.Lcd.print("MAC: "); M5.Lcd.println(myMacAddress); // แสดง MAC Address เพื่อระบุตัวตน
+    M5.Lcd.setCursor(5, 25);
+    M5.Lcd.printf("Username: %s\n", currentUsername.c_str());
+    M5.Lcd.printf("Authen Status: %s\n", authenStatus.c_str());
+    M5.Lcd.printf("CCoin: %d\n", ccoin);
+    
+    M5.Lcd.setCursor(5, 85);
+    M5.Lcd.printf("ALERT: \n%s", alertText.c_str());
+}
+
+// Handler สำหรับรับ Username จาก Core2 (/set_username)
+void handleUsername(AsyncWebServerRequest *request) {
+    if (request->hasParam("username", true)) {
+        String receivedUsername = request->getParam("username", true)->value();
+
+        // 8a. StickC-Plus2 ส่งเสียงแจ้งเตือนเมื่อได้รับข้อมูล
+        M5.Speaker.tone(1500, 150); 
+        
+        // 9a. อัพเดทสถานะบนหน้าจอ
+        currentUsername = receivedUsername;
+        alertText = "Identity Created Successfully";
+        authenStatus = "x"; 
+        updateDisplay(); 
+        
+        request->send(200, "text/plain", "Username received.");
+    } else {
+        request->send(400, "text/plain", "Missing Username Parameter.");
+    }
+}
+
+// Handler สำหรับรับ Coin จาก Paper (/add_coin)
+void handleCoin(AsyncWebServerRequest *request) {
+    if (request->hasParam("value", true)) {
+        String coin = request->getParam("value", true)->value();
+
+        M5.Speaker.tone(1500, 150);
+
+        ccoin += coin.toInt();
+        alertText = "Receive " + coin + " CCoin";
+        updateDisplay();
+
+        request->send(200, "text/plain", "Coin received.");
+    } else {
+        request->send(400, "text/plain", "Missing value Parameter.");
+    }
+}
+
+void setup() {
+    auto cfg = M5.config();
+    M5.begin(cfg);
+    M5.Lcd.setRotation(3); 
+
+    // Assign static IP
+    WiFi.config(local_IP, gateway, subnet);
+
+    // 1. เชื่อมต่อ Wi-Fi เข้ากับ SoftAP ของ Core2
+    WiFi.begin(SSID_AP, PASSWORD_AP);
+    
+    while (WiFi.status() != WL_CONNECTED) { 
+        delay(500);
+    }
+    
+    // เก็บ MAC Address ของตัวเอง
+    myMacAddress = WiFi.macAddress(); 
+    
+    M5.Lcd.printf("Connected! IP: %s\n", WiFi.localIP().toString().c_str());
+    M5.Lcd.printf("MAC: %s (Target for Station 2)\n", myMacAddress.c_str());
+
+    // 2. ตั้งค่า Server เพื่อรอรับ Request จาก Core2
+    stickCServer.on("/set_username", HTTP_POST, handleUsername);
+    stickCServer.on("/add_coin", HTTP_POST, handleCoin);
+    stickCServer.begin();
+
+    // แสดง UI เริ่มต้น
+    updateDisplay();
+}
+
+void loop() {
+    M5.update();
+}
\ No newline at end of file