#define LED_PIN 13
#define LED_PIN1 12
#define LED_PIN2 11

#define BUTTON_PIN 8
byte lastButtonState;
byte ledState = LOW;
unsigned long lastTimeButtonStateChanged = millis();
unsigned long debounceDuration = 50; // millis
void setup() {
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT);
  lastButtonState = digitalRead(BUTTON_PIN);
}
void loop() {
  if (millis() - lastTimeButtonStateChanged >= debounceDuration) {
    byte buttonState = digitalRead(BUTTON_PIN);
    if (buttonState != lastButtonState) {
      lastTimeButtonStateChanged = millis();
      lastButtonState = buttonState;
      if (buttonState == LOW) {
        if(ledState==HIGH){
          ledState = LOW;
        }
        else{
          ledState = HIGH;
        }
      digitalWrite(LED_PIN, ledState);
      digitalWrite(LED_PIN1, ledState);
      digitalWrite(LED_PIN2, ledState);


      }
    }


  }
}