int led = 12;
int pot = A1;
int dan;
int str;

void setup() {
  // put your setup code here, to run once:
  pinMode(led, OUTPUT);
  pinMode(pot, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  dan = analogRead(pot);
  str = dan / 4;
  digitalWrite(led, str);
}