Backyard Aquaponics
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void feeder() {                                // this subroutine is only called when the interrupt triggers
  relay_feederTrigger = 1;                         // set the trigger flag
  detachInterrupt(0);                                // disable the interrupt
}

// Relay feeder snippet of main code
  if (relay_feederTrigger == 1){                 // if feeder switch was hit...
    relay_feederValue++;                           // increment feeder value to report to grovestreams
    digitalWrite(feederLEDPin, LOW);           // turn off LED
    digitalWrite(relay_feederPin, LOW);       // turn on relay
    delay(relay_feederDuration);                // this code is blocking to ensure accurate timing
    digitalWrite(relay_feederPin, HIGH);     // turn off relay
    relay_feederTimer = millis();                // set timer
    relay_feederTrigger = 0;                      // reset trigger flag
  } else {
    digitalWrite(relay_feederPin, HIGH);     // if flag is low make sure relay is off
  }

  if ((millis() - relay_feederTimer) >= relay_feederTimeout){     // wait timeout to reset feeder
    EIFR = (1 << INTF4);                                           // clear pending interrupts in queue
    attachInterrupt(0, feeder, FALLING);                              // enable interrupt
    digitalWrite(feederLEDPin, HIGH);                                    // turn on LED
  }