const int Red_pin = 4;

const int Yellow_pin = 3;

const int Green_pin = 5;

const int pot_pin = A0;

int pot_val;

 

void setup() {

  // put your setup code here, to run once:

Serial.begin(9600);

pinMode(Red_pin,OUTPUT);

pinMode(Yellow_pin,OUTPUT);

pinMode(Green_pin,OUTPUT);

 

}

 

void loop() {

  // put your main code here, to run repeatedly:

  pot_val = analogRead(pot_pin);

if(pot_val <= 341){

  digitalWrite(Red_pin,HIGH);

  digitalWrite(Yellow_pin,LOW);

  digitalWrite(Green_pin,LOW);

}

else if(pot_val <= 682){

  digitalWrite(Red_pin,LOW);

  digitalWrite(Yellow_pin,HIGH);

  digitalWrite(Green_pin,LOW);

}

else{

  digitalWrite(Red_pin,LOW);

  digitalWrite(Yellow_pin,LOW);

  digitalWrite(Green_pin,HIGH);

}

delay(500);

}