#define pot A0
#define red 13
#define green 12
#define blue 11

void setup(){
  pinMode(pot, INPUT);
  pinMode(red, OUTPUT);
  pinMode(green, OUTPUT);
  pinMode(blue, OUTPUT);
}
void loop(){
  int temp = analogRead(pot);
  int value = map(temp, 0,1023, 0,255);
  if(value < 100){
    digitalWrite(red, HIGH);
    digitalWrite(green, LOW);
    digitalWrite(blue, LOW);
  }
  else if(value < 200){
    digitalWrite(red, LOW);
    digitalWrite(green, HIGH);
  }
  else{
    digitalWrite(green, LOW);
    digitalWrite(blue, HIGH);
  }
}