Automatic Cat Feeder

cat-feeder.ino

#define MOTOR_PIN        9
#define FEED_INTERVAL_MS 21600000  // 6 hours
#define MOTOR_TIME_MS    1000      // 1 second (about ~ 1/4 cup)

void setup() {   
  pinMode(MOTOR_PIN, OUTPUT);
}

void loop() {
  feed(MOTOR_TIME_MS);
  delay(FEED_INTERVAL_MS);
}

/**
 * Feed for n milliseconds
 */
void feed(unsigned long n) {
  digitalWrite(motorPin, HIGH);
  delay(n); 
  digitalWrite(motorPin, LOW);
}