const int potPin = A0;
volatile bool buttonPressed= false;

void setup() {
  Serial.begin(9600);
  // put your setup code here, to run once:
pinMode(2, INPUT);

pinMode(11, OUTPUT);
pinMode(13, OUTPUT);

attachInterrupt(digitalPinToInterrupt(2),handleButtonPress, FALLING);

}

void loop() {
   int potValue = analogRead(potPin);
   int delayTime = map(potValue,0, 1023, 10, 2000);

  if (buttonPressed) {
      digitalWrite(11, HIGH);
      delay(delayTime);
}else { analogWrite(11, LOW);
  }
  
  if (buttonPressed){
    Serial.println("Button was pressed!");
    buttonPressed = false; //reset flag
  }
  
  }
  

  void handleButtonPress() {
    buttonPressed = true; //set flag when button pressed
  }