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old.ino

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+#include <ArduinoJson.h>
+#include <HTTPClient.h>
+#include <SPI.h>
+#include <TFT_eSPI.h>
+#include <WiFi.h>
+#include <vector>
+
+const char* ssid = "UPCED7EFB8";        // type your WiFi name
+const char* password = "tFax8Er3yycw";  // type your WiFi password
+
+#define TFT_BG tft.color565(0, 5, 0)
+#define TFT_TEXT tft.color565(255, 240, 93)
+#define TFT_HEIGHT 170
+#define TFT_WIDTH 320
+#define DELAY_MS 30000
+
+#define SQUARE_SIZE 15
+
+// chose you RBL from https://till.mabe.at/rbl/?line=102&station=4909
+#define URL "https://www.wienerlinien.at/ogd_realtime/monitor?activateTrafficInfo=stoerunglang&rbl=1366"
+
+const std::pair<String, String> splitString(String inputString);
+String getJson();
+
+TFT_eSPI tft = TFT_eSPI();
+
+void setup() {
+  Serial.begin(115200);
+  delay(1);
+
+  // Connect to Wi-Fi
+  WiFi.begin(ssid, password);
+  Serial.println("Connecting to WiFi...");
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(100);
+    Serial.print(".");
+  }
+  Serial.println("Connected to WiFi");
+  screenInit();
+}
+
+
+void loop() {
+  std::vector<int> countdownVector;
+  String name;         // Line name 2, 72, D etc.
+  String towards;      // Tram directions.
+  String description;  // Line alarm
+
+  // Parse JSON response
+  {
+    String response = getJson();
+    DynamicJsonDocument root(2048 * 8);
+    DeserializationError error = deserializeJson(root, response, DeserializationOption::NestingLimit(32));
+    if (error) {
+      Serial.println("Failed to parse JSON response.");
+      Serial.println(error.c_str());
+      screenInit();  // draw empty screen
+      delay(DELAY_MS);
+      return;
+    }
+
+    /*
+      root
+      |- data
+      |  |- trafficInfos
+      |  |  |- trafficInfo[]
+      |  |  |  |- description[0]
+      |  |- monitors[]
+      |  |  |- monitor[0]
+      |  |  |  |- lines[]
+      |  |  |  |  |- line[0]
+      |  |  |  |  |  |- name
+      |  |  |  |  |  |- towards
+      |  |  |  |  |  |- departures
+      |  |  |  |  |  |  |- departure
+    */
+    JsonObject data = root["data"];
+    JsonArray trafficInfos = data["trafficInfos"];
+    JsonObject trafficInfo = trafficInfos[0];
+    description = trafficInfo["description"].as<String>();
+    JsonArray monitors = data["monitors"];
+    JsonObject moniror = monitors[0];
+    JsonArray lines = moniror["lines"];
+    JsonObject line = lines[0];
+    name = line["name"].as<String>();
+    towards = line["towards"].as<String>();
+    JsonObject departures = line["departures"];
+    JsonArray departure = departures["departure"];
+
+    for (const auto& i : departure) {
+      JsonObject departureTime = i["departureTime"];
+      int countdown = departureTime["countdown"].as<int>();
+      countdownVector.push_back(countdown);
+    }
+  }
+
+  // Print countdowns.
+  Serial.print("Countdown values: ");
+  for (auto& countdown : countdownVector) {
+    Serial.print(countdown);
+    Serial.print(" ");
+  }
+  Serial.println();
+
+  unsigned int row_count = 2;
+
+  for (int lineIndex = 0; lineIndex < min(countdownVector.size(), row_count); lineIndex++) {
+    int dy = (TFT_HEIGHT / 2) * lineIndex;
+
+    // Print name line.
+    tft.setTextSize(1);
+    tft.setTextColor(TFT_TEXT, TFT_BG);
+    tft.setCursor(10, 25 + dy, 6);
+    tft.print(name);
+
+    // Print name station.
+    tft.setTextSize(1);
+    std::pair<String, String> towards_lines_pair = splitString(towards);
+    tft.setCursor(48, 21 + dy, 4);
+    tft.println(towards_lines_pair.first);
+    tft.setCursor(48, 43 + dy, 4);
+    tft.println(towards_lines_pair.second);
+
+    // Print countdown.
+    tft.setTextSize(1);
+    tft.setTextColor(TFT_TEXT, TFT_BG);
+    tft.setCursor(260, 25 + dy, 6);
+    int countdown = countdownVector[lineIndex];
+    if (countdown == 0) {
+      tft.print("     ");
+    } else if (countdown < 10) {
+      tft.print("  ");
+      tft.print(countdown);
+    } else {
+      tft.print(countdown);
+    }
+  }
+  int c_down_1 = 0;
+  int c_down_2 = 0;
+
+  if (countdownVector.size() >= 1) {
+    c_down_1 = countdownVector[0];
+  }
+  if (countdownVector.size() >= 2) {
+    c_down_2 = countdownVector[1];
+  }
+
+  if (!c_down_1 || !c_down_2) {
+    int dx = 280;
+    int dy = 30;
+    int dy_line = TFT_HEIGHT / 2;
+
+    for (int i = 0; i < DELAY_MS; i += 2000) {
+      if (c_down_1 == 0 && countdownVector.size() >= 1) {
+        drawZero(dx, dy, true);
+      }
+      if (c_down_2 == 0 && countdownVector.size() >= 2) {
+        drawZero(dx, dy + dy_line, true);
+      }
+      delay(1001);
+      if (c_down_1 == 0 && countdownVector.size() >= 1) {
+        drawZero(dx, dy, false);
+      }
+      if (c_down_2 == 0 && countdownVector.size() >= 2) {
+        drawZero(dx, dy + dy_line, false);
+      }
+      delay(1001);
+    }
+    if (c_down_1 == 0 && countdownVector.size() >= 1) {
+      tft.fillRect(dx, dy, SQUARE_SIZE * 2, SQUARE_SIZE * 2, TFT_BG);
+    }
+    if (c_down_2 == 0 && countdownVector.size() >= 2) {
+      tft.fillRect(dx, dy + dy_line, SQUARE_SIZE * 2, SQUARE_SIZE * 2, TFT_BG);
+    }
+    return;
+  }
+  delay(DELAY_MS);  // Delay 20 seconds
+}
+
+void drawZero(int x, int y, bool b) {
+  int square_fg = SQUARE_SIZE - 1;
+  int offset = b ? SQUARE_SIZE : 0;
+
+  tft.fillRect(x, y, SQUARE_SIZE * 2, SQUARE_SIZE * 2, TFT_BG);
+  tft.fillRect(x + offset, y, square_fg, square_fg, TFT_TEXT);
+  tft.fillRect(x + (offset ^ SQUARE_SIZE), y + SQUARE_SIZE, square_fg, square_fg, TFT_TEXT);
+}
+
+String getJson() {
+  if (WiFi.status() != WL_CONNECTED) { return ""; }
+
+  HTTPClient http;
+  String url = URL;
+
+  // Print the URL to the serial port
+  Serial.println(url);
+
+  // Start the HTTP request
+  http.begin(url);
+
+  // Get the status code of the response
+  int httpCode = http.GET();
+
+  // Print the status code to the serial port
+  Serial.print("HTTP status code: ");
+  Serial.println(httpCode);
+
+  // Check if the request was successful
+  if (httpCode <= 0) {
+    // The request failed
+    Serial.println("Error on HTTP request");
+    return "";
+  } else if (httpCode == HTTP_CODE_OK) {
+    // The request was successful
+    // Get the response payload as a string
+    String payload = http.getString();
+    return payload;
+  }
+}
+
+
+const std::pair<String, String> splitString(String inputString) {
+  int max_char_in_line = 17;
+
+  String firstPart = "";
+  String secondPart = "";
+
+  if (inputString.length() > max_char_in_line) {
+    int spaceIndex = inputString.lastIndexOf(' ', max_char_in_line);
+    int dashIndex = inputString.lastIndexOf('-', max_char_in_line);
+
+    if (spaceIndex > dashIndex) {
+      firstPart = inputString.substring(0, spaceIndex);
+      secondPart = inputString.substring(spaceIndex + 1);
+    } else if (dashIndex > spaceIndex) {
+      firstPart = inputString.substring(0, dashIndex);
+      secondPart = inputString.substring(dashIndex + 1);
+    }
+  }
+  else
+  {
+    firstPart = inputString;
+  }
+
+  return std::make_pair(firstPart, secondPart);
+}
+
+void screenInit() {
+  // Initialize the display
+  tft.init();
+  tft.setRotation(1);
+  tft.fillScreen(TFT_BG);
+
+  // Draw middle line
+  const int middle_line_height_px = 4;
+  int y_coordinate_middle = (tft.height() - middle_line_height_px) / 2;
+
+  // Use a single function call to draw the line
+  tft.drawFastHLine(0, y_coordinate_middle, tft.width(), TFT_BLACK);
+}