   pinMode(PARACHUTE_PIN, OUTPUT);
   pinMode(WATERSPLASHER_PIN, OUTPUT);
 
+  // Setup interrupt on supply zero-crossing
   attachInterrupt(ZERO_CROSSING_INTERRUPT, zero_cross_detect, RISING);
 }
 

  while(Serial.available() < 1){
    ;
  }
 return Serial.read();
}

void loop()

      digitalWrite(WATERSPLASHER_PIN, LOW);
    break;
  default:
    Serial.write('?');
    break;
  }
}
