int led = 6;
int pot = A0;
int but = 4;

void setup() {
  pinMode(led, OUTPUT);
  digitalWrite(led, LOW);
  pinMode(but, INPUT);
  digitalWrite(but, HIGH);
}

void loop() {
  int temp = analogRead(pot);
  temp *= 10;
  int button = digitalRead(but);
  if(button == LOW){
    Serial.println(temp);
    digitalWrite(led, HIGH);
    delay(temp);
    digitalWrite(led,LOW);
  }else{
    digitalWrite(led,LOW);
  }
}