const int buttonPin = 2;
const int ledPin = 13;


int ledState = HIGH;        
int buttonState;            
int lastButtonState = LOW; 


unsigned long lastDebounceTime = 0;
unsigned long debounceDelay = 50;

void setup() {
  pinMode(8, INPUT_PULLUP);
  pinMode(4, OUTPUT);

  
  digitalWrite(4, ledState);
}

void loop() {
millissw();
 

 
}


void millissw(){
 int reading = digitalRead(8);

  
  if (reading != lastButtonState) {
    
    lastDebounceTime = millis();
  }

  if ((millis() - lastDebounceTime) > debounceDelay) {
    

    
    if (reading != buttonState) {
      buttonState = reading;

      
      if (buttonState == HIGH) {
        ledState = !ledState;
      }
    }
  }

  // set the LED:
  digitalWrite(4, ledState);

  // save the reading. Next time through the loop, it'll be the lastButtonState:
  lastButtonState = reading;

}