   Serial.println("Timeout!");
   onTimeout();
 
-  attachInterrupt(digitalPinToInterrupt(INT_PIN), trellisIsr, LOW);
+  attachInterrupt(digitalPinToInterrupt(TRELLIS_INT_PIN), trellisIsr, LOW);
   LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF); 
 
   if (state == TIMEOUT_WAIT) {

void initializeTrellis() {
  // INT pin requires a pullup;
  // this is also the MIDI Tx pin recommended to bound to high
  pinMode(INT_PIN, INPUT_PULLUP);

  trellis.begin(0x70);
  //trellis.readSwitches(); // ignore already pressed switches

}

void trellisIsr() {
  detachInterrupt(digitalPinToInterrupt(TRELLIS_INT_PIN));
  state = IDLE_LIGHT_UP;
}

