sketch_led_button.ino

// NOTE: 2- BUTTON PUTS LED ON

int pinLed = 3;
int pinButton = 2;
int buttonState = 0;
int pressCount = 0;
bool isFirstPress = false;


void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(pinLed, OUTPUT);
  pinMode(pinButton, INPUT);
  Serial.println("== SETUP - BUTTON PUTS LED ON ==");
}

void loop() {
  // put your main code here, to run repeatedly:
  buttonState = digitalRead(pinButton);
  if (buttonState == HIGH) {
    if (isFirstPress == false)
      isFirstPress = true;
    if (isFirstPress)
      if (pressCount == 0)
        pressCount = 1;
      else if (pressCount == 2)
        pressCount = 3;
  }
  if (buttonState == LOW)
    if (isFirstPress)
      if (pressCount == 1)
        pressCount = 2;
      else if (pressCount == 3) {
        isFirstPress = false;
        pressCount = 0;
      }
  if (pressCount == 1 || pressCount == 2)
    digitalWrite(pinLed, HIGH);
  else
    digitalWrite(pinLed, LOW);
  // Serial.println(pressCount); // NOTE: uncomment this for show messages in console
}