arduino.c

typedef struct {
  String name;
  void (*command)();
} Message;

void bellOn() {
  digitalWrite(RING,  HIGH);
}

void bellOff() {
  digitalWrite(RING,  LOW);
}

void longBell() {
  bellOn();
  delay(100);
  bellOff();
}

void shortBell() {
  bellOn();
  delay(50);
  bellOff();
}

const Message messages[] = {
  { name: "short",  command: &shortBell },
  { name: "long",  command: &longBell },
};