int piN1=11;
int piN2=12;
int piN3=13;
int readPin=A3;
int potentiometer=10;
int readVal;
int V2;
int DT=500;
void setup() {
  // put your setup code here, to run once:
pinMode(piN1, OUTPUT);
pinMode(piN2, OUTPUT);
pinMode(piN3, OUTPUT);
pinMode(potentiometer, INPUT);
pinMode(readPin, INPUT);
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
if (V2>=1  && V2<=2 ){
digitalWrite(piN3, HIGH);
if (V2<=1 || V2>=2)
digitalWrite(piN3, LOW);
}
if (V2>=3  && V2<=4 ){
digitalWrite(piN2, HIGH);
if (V2<=3 || V2>=4)
digitalWrite(piN2, LOW);
}
if (V2>=5  && V2<=6 ){
digitalWrite(piN1,HIGH);
if (V2<=4 || V2>=5)
digitalWrite(piN1, LOW);
}
delay(DT);{
readVal= analogRead(readPin);
V2= (5./1023.)*readVal;
Serial.println("potentiometer voltage is");
Serial.println(V2);
}
}