Arduino sketch to move a servo given some kind of trigger

Boney.ino

/*
 * Boney.ino
 * Arduino sketch to move a servo given some kind of trigger
 * (falling edge)
 *
 * Author: Adam Carmichael <carneeki@carneeki.net>
 * License: Unlicensed.
 * Warranties: None. This hasn't been tested yet. Don't poke your eye
 * out.
 */

#include <Servo.h>

#define POS_DOWN 0      // down position
#define POS_UP 180      // up position
#define HOLD_TIME 3000  // hold up for this many millis
#define PIN_SERVO 9     // servo pin (must be PWM capable)
#define PIN_TRIG 2      // only pins 2 or 3 for interrupts on uno

Servo srv;
boolean state = false;

void setup() {
  pinMode(PIN_TRIG, INPUT_PULLUP);
  pinMode(PIN_SERVO, OUTPUT);
  srv.attach(PIN_SERVO);
}

void main() {
  srv.write(state ? POS_UP : POS_DOWN);

  if(state) {
    delay(HOLD_TIME);
    state = false;
  }

  sleep(50);
}

void raise() {
  state = true;
}

// call ISR on falling edge
attachInterrupt(digitalPinToInterrupt(PIN_TRIG), raise, FALLING);