#include<Wire.h>
#include<Servo.h>

#define IDLE 0
// Example uses only three scenes
#define SCENE3 3
#define SCENE4 4
#define SCENE16 16

#define SERVO_PIN 12
#define I2C_ADDRESS 10

volatile int state = IDLE;

Servo servo;

void setup() {
  
  // Setup directions
  Wire.begin(I2C_ADDRESS);
  Wire.onReceive(receiveDirection);
  
  // Setup servo
  servo.attach(SERVO_PIN);
  servo.write(0);
}

void loop() {

  // This runs repeatedly  

  if (state == IDLE) {
    // Do nothing
  } else if (state == SCENE3) {
    servo.write(90);
    state = IDLE;
  } else if (state == SCENE4) {
    servo.write(0);
    state = IDLE;
  } else if (state == SCENE16) {
    servo.write(90);
    delay(300);
    servo.write(30);
    delay(300);
  }

}

// This is run every time the director sends a command
void receiveDirection(int numBytes) {
  // Read what value the director sends
  byte scene = Wire.read();
  // Save the value into the state
  state = (int)scene;
}