Did the pin-layout of the mega adk board change? I have an R3. According to the documentation, 43:INT0 --> DIGITAL pin 21 (SCL) I ran a simple sketch; void setup() { attachInterrupt(0, goLow, LOW); pinMode(8, OUTPUT); } void loop() { digitalWrite(8, HIGH); } void goLow() { digitalWrite(8, …

MEGA ADK pin layout change???

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