arduino_state.ino

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

int state = 0;
int oldVal = 0;
int val = 0;

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

void loop() {
  updateStateFromInput();

  // --------

  if (state == 1) {
    digitalWrite(LED_PIN, HIGH);
  } else if (state == 2) {
    renderBlinkState();
  } else {
    digitalWrite(LED_PIN, LOW);
  }
}

void updateStateFromInput() {
  val = digitalRead(BUTTON_PIN);
  if ((val == LOW) && (oldVal == HIGH)) {
    state = state + 1;
    if (state > 2) {
      state = 0;
    }
  }
  oldVal = val;
}

void renderBlinkState() {
  for (int i = 0; i < 10; i++) {
    digitalWrite(LED_PIN, HIGH);
    delay(100);
    digitalWrite(LED_PIN, LOW);
    delay(100);
  }
  state = 0;
}