// https://roboticsbackend.com/arduino-turn-led-on-and-off-with-button/

#define LED_PIN 2
#define BUTTON_PIN 3
byte lastButtonState = HIGH;
//byte ledState = LOW;
unsigned long debounceDuration = 50; // millis
unsigned long lastTimeButtonStateChanged = 0;
int a = 0;

void setup() {
  pinMode(LED_PIN, OUTPUT);
  Serial.begin(9600);
  pinMode(BUTTON_PIN, INPUT_PULLUP);


}
void loop() {
  unsigned long currentMillis = millis();
  if (currentMillis - lastTimeButtonStateChanged >= debounceDuration) {
    byte buttonState = digitalRead(BUTTON_PIN);
    if (buttonState != lastButtonState) {
      lastTimeButtonStateChanged = currentMillis;
      lastButtonState = buttonState;
      if (buttonState == HIGH) {
        //Serial.println("======= Release =======");
        Serial.println("======= Press =======");
        a=a+1;
        if(a == 1){
          digitalWrite(LED_PIN, HIGH);
        }else if (a == 2){
          digitalWrite(LED_PIN, LOW);
          a=0;
        }
      }
    }
  }
}