#define r 11
#define y 12
#define g 13
int pot=A4;
float pot_value;
float voltage;
void setup() {
  // put your setup code here, to run once:
  pinMode(r, OUTPUT);
  pinMode(y, OUTPUT);
  pinMode(g, OUTPUT);
  pinMode(pot, INPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
 pot_value=analogRead(pot);
 if( pot_value>=0 && pot_value<=255){
  digitalWrite(r, HIGH);
  digitalWrite(y, LOW);
  digitalWrite(g, LOW);
 }
 else if( pot_value>255 && pot_value<=512){
  digitalWrite(y,HIGH);
  digitalWrite(r, LOW);
  digitalWrite(g, LOW);

 }
 else if( pot_value>513 && pot_value<767){
  digitalWrite(g,HIGH);
  digitalWrite(r, LOW);
  digitalWrite(y, LOW);
 }
 else{
  digitalWrite(r, HIGH);
  digitalWrite(y, HIGH);
  digitalWrite(g, HIGH);

 }
 Serial.print("Pot Value:");
 Serial.println(pot_value);
 delay(1000);
 voltage=(pot_value*5)/1024;
 Serial.print("Voltage value: ");
 Serial.print(voltage);
 Serial.println("V");
 delay(1000);
}