int potentiometerPin =  A0;
int bluepin = 9 ;
int redpin = 10 ;
int greenpin = 11 ;
void setup() {
  // put your setup code here, to run once:
  pinMode(bluepin, OUTPUT);
  pinMode(redpin, OUTPUT);
  pinMode(greenpin, OUTPUT);
  Serial.begin(9600);
}
  void loop() {
  // put your main code here, to run repeatedly:
  int sensorValue = analogRead(potentiometerPin) ;
  Serial.println(sensorValue) ;

  if (sensorValue > 0 && sensorValue < 400) {
    digitalWrite(bluepin, HIGH);
  } else {
    digitalWrite(bluepin, LOW);

  }

  if (sensorValue >= 400 && sensorValue < 600)  {
    digitalWrite(redpin, HIGH);
  } else {
    digitalWrite(redpin, LOW);

  }

  if (sensorValue > 600) {
    digitalWrite(greenpin, HIGH);
  } else {
    digitalWrite(greenpin, LOW);

  }

  delay(660);

}