int LED1 = 4;
int LED2 = 5;
int LED3 = 2;
int LED4 = 3;
int value;
int pot = A0;

void setup() {
  Serial.begin(115200);
  pinMode(pot, INPUT);
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
  pinMode(LED4, OUTPUT);

}

void loop() {
  value = analogRead(pot);
  value = map(value, 0, 1023, 1, 4);
  Serial.println(value);
  if(value==4) {
    digitalWrite(LED4, HIGH);
    digitalWrite(LED3, LOW);
    digitalWrite(LED2, LOW);
    digitalWrite(LED1, LOW);

  } 

  if(value==3) {
    digitalWrite(LED3, HIGH);
    digitalWrite(LED4, LOW);
    digitalWrite(LED2, LOW);
    digitalWrite(LED1, LOW);
  }  

  if(value==2) {
    digitalWrite(LED2, HIGH);
    digitalWrite(LED3, LOW);
    digitalWrite(LED4, LOW);
    digitalWrite(LED1, LOW);
  }  

  if(value==1) {
    digitalWrite(LED1, HIGH);
  	digitalWrite(LED3, LOW);
    digitalWrite(LED2, LOW);
    digitalWrite(LED4, LOW);

  }
}