         alertTimer = addTimer(random(1000, 5000), dropConnector);
         // propagate signal though network
         for (int j=0; j<NUM_CONN; j++) if (j!=busIndex) txWrite(j, ALERT);
+        blink();
       }
       break;
     case DROPPING_CONNECTOR: // some connector in the network is dropped

  }
}

void setup() {
  // set up pins
  for (int i=0; i<NUM_CONN; i++) {

  }
  pinMode(leds1pin, OUTPUT);
  pinMode(leds2pin, OUTPUT);
  pinMode(debugLedPin, OUTPUT);
  pinMode(button1pin, INPUT_PULLUP);
  pinMode(button2pin, INPUT_PULLUP);

