const int led = 9;
const int button = 2;
const int pot = A0;

bool lampOn = false; 

int buttonState = HIGH;
int lastButtonRead = HIGH;

unsigned long lastDebounceTime = millis();
const unsigned long debounceDelay = 50; // [ms]

void setup() {
  pinMode(led, OUTPUT);
  pinMode(button, INPUT_PULLUP);
}

void loop() {
  int reading = digitalRead(button);
   
  if (reading != lastButtonRead) {
    lastDebounceTime = millis();
  }
  if ((millis() - lastDebounceTime) > debounceDelay) {
    if (reading != buttonState) {
      buttonState = reading;
      if (buttonState == LOW) {
        lampOn = !lampOn;
      }
    }
  }
  lastButtonRead = reading;

  if (lampOn) {
    int potValue = analogRead(pot);              
    int pwmValue = map(potValue, 0, 1023, 0, 255); 
    analogWrite(led, pwmValue);
  } else {
    analogWrite(led, 0);
  }
}