int sensorPin = A0;
int sensorValue = 0;
int orangeLed = 8;
int yellowLed = 9;
int blueLed = 10;
int relayPin = 7;

void setup() {
  Serial.begin(9600);
  pinMode(sensorPin, INPUT);
  pinMode(orangeLed, OUTPUT);
  pinMode(yellowLed, OUTPUT);
  pinMode(blueLed, OUTPUT);
  pinMode(relayPin, OUTPUT);
}

void loop() {
  sensorValue = analogRead(sensorPin);
  Serial.println(sensorValue);

  if (sensorValue <= 50) {
    digitalWrite(orangeLed, HIGH);
    digitalWrite(yellowLed, LOW);
    digitalWrite(blueLed, LOW);
    digitalWrite(relayPin, LOW);
  } 
  else if (sensorValue <= 300) {
    digitalWrite(orangeLed, LOW);
    digitalWrite(yellowLed, HIGH);
    digitalWrite(blueLed, LOW);
    digitalWrite(relayPin, LOW);
  } 
  else if (sensorValue <= 500) {
    digitalWrite(orangeLed, LOW);
    digitalWrite(yellowLed, LOW);
    digitalWrite(blueLed, HIGH);
    digitalWrite(relayPin, LOW);
  } 
  else {
    digitalWrite(orangeLed, HIGH);
    digitalWrite(yellowLed, HIGH);
    digitalWrite(blueLed, HIGH);
    digitalWrite(relayPin, HIGH);
  }

  delay(500);
}