#define Vr A0
#define led1 12
#define led2 11
#define led3 10
#define led4 9
#define led5 8
int val,map_val;
void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(led1, OUTPUT);
pinMode(led2, OUTPUT);
pinMode(led3, OUTPUT);
pinMode(led4, OUTPUT);
pinMode(led5, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  val = analogRead(Vr);
  map_val=map(val,0,1023,1,5);
  Serial.println(map_val);
  switch(map_val){
    case 1 : digitalWrite(led1,1);
             digitalWrite(led2,0);
             digitalWrite(led3,0);
             digitalWrite(led4,0);
             digitalWrite(led5,0);
             break;
    case 2 : digitalWrite(led1,1);
             digitalWrite(led2,1);
             digitalWrite(led3,0);
             digitalWrite(led4,0);
             digitalWrite(led5,0);
             break;
    case 3 : digitalWrite(led1,1);
             digitalWrite(led2,1);
             digitalWrite(led3,1);
             digitalWrite(led4,0);
             digitalWrite(led5,0);
             break;
    case 4 : digitalWrite(led1,1);
             digitalWrite(led2,1);
             digitalWrite(led3,1);
             digitalWrite(led4,4);
             digitalWrite(led5,0);
             break;
    case 5 : digitalWrite(led1,1);
             digitalWrite(led2,1);
             digitalWrite(led3,1);
             digitalWrite(led4,1);
             digitalWrite(led5,1);
             break;
  }
  delay(100);
}