diff --git a/.gitignore b/.gitignore
index 472ce4e..f503195 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
-package_builds/
+package_builds
+*.log
diff --git a/arduino_connect b/arduino_connect
index 2b16aa2..ee043aa 160000
--- a/arduino_connect
+++ b/arduino_connect
@@ -1 +1 @@
-Subproject commit 2b16aa2da5d23be1b3e907caa2352aaf96c77dbe
+Subproject commit ee043aaa26ccfa81a41b28d1cc8c1cfa3e13bf1a
diff --git a/diyemg_sketch_1.1-a.1/diyemg_sketch_1.1-a.1.ino b/diyemg_sketch_1.2-a.1/diyemg_sketch_1.2-a.1.ino
similarity index 93%
rename from diyemg_sketch_1.1-a.1/diyemg_sketch_1.1-a.1.ino
rename to diyemg_sketch_1.2-a.1/diyemg_sketch_1.2-a.1.ino
index a0963a2..d44df78 100644
--- a/diyemg_sketch_1.1-a.1/diyemg_sketch_1.1-a.1.ino
+++ b/diyemg_sketch_1.2-a.1/diyemg_sketch_1.2-a.1.ino
@@ -1,4 +1,4 @@
-/* DIY Spiker unit controller - v1.0
+/* DIY Spiker unit controller - v1.2
    Written by Kevin Williams
     10/26/2020:
     - Complete rewrite to match new hardware specifications
@@ -72,11 +72,20 @@ inline void __attribute__((optimize("O3"))) update_output(const int level) {
     return;
 }
 
+ISR(TIMER1_OVF_vect) {
+    digitalWrite(LED_BUILTIN, !digitalRead(LED_BUILTIN));
+}
 
 void setup(void) {
     Serial.begin(115200);
     String mode;
     char buff[10];
+
+    // standby signal
+    TCCR1A = 0;
+    TCCR1B = 0x3; 
+    TCNT1 = 0;
+    TIMSK1 = _BV(TOIE1);    // enable TIMER2 overflow interrupt
     
     // indicator
     pinMode(LED_BUILTIN, OUTPUT);
@@ -146,6 +155,10 @@ void setup(void) {
     // 0 = A0, 1 = A1
     ADMUX = (1 << REFS0) | channel_select;
     ADCSRA = 0x82;
+
+    // disable status led
+    TIMSK1 = 0;
+    digitalWrite(LED_BUILTIN, 0);
 }