buttonState.ino

const int BUTTON_PIN = 9;
const int LED_PIN = 13;

int state = 0;
int lastVal = 0;

void setup() {
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT_PULLUP);
}

void loop() {
  int val = digitalRead(BUTTON_PIN);

  // transition if necessary based on input
  if (val == LOW && lastVal == HIGH) {
    if (state == 0) {
      state = 1;
    } else if (state == 1) {
      state = 2;
    } else {
      state = 0;
    }
    delay(10);
  }
  lastVal = val;


  // respond to the state
  if (state == 1) {
    digitalWrite(LED_PIN, HIGH);
  } else if (state == 2) {
    digitalWrite(LED_PIN, HIGH);
    delay(50);
    digitalWrite(LED_PIN, LOW);
    delay(50);
   } else {
    digitalWrite(LED_PIN, LOW);
  }
}