#define G 12
#define Y 14
#define R 27
void setup() {
  Serial.begin(9600);
  pinMode(G, OUTPUT);pinMode(Y, OUTPUT);pinMode(R, OUTPUT);
}
void loop() {
  int pot = analogRead(4);
  Serial.print("POT = ");
  Serial.println(pot);
  delay(500);
  if(pot > 3000){
    digitalWrite(G, LOW);digitalWrite(Y, LOW);digitalWrite(R, HIGH);
  }
  else if(pot > 2000){
    digitalWrite(G, LOW);digitalWrite(Y, HIGH);digitalWrite(R, LOW);
  }

}