#define LDR_PIN A0
#define RED_PIN 9
#define GREEN_PIN 10
#define BLUE_PIN 11
#define THRESHOLD_LOW 300
#define THRESHOLD_MED 700
#define DELAY_TIME 200

void setup() {
  pinMode(RED_PIN, OUTPUT);
  pinMode(GREEN_PIN, OUTPUT);
  pinMode(BLUE_PIN, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  int lumina = analogRead(LDR_PIN);
  Serial.print("Lumina: ");
  Serial.println(lumina);

  if (lumina < THRESHOLD_LOW) {
    analogWrite(RED_PIN, 255);
    analogWrite(GREEN_PIN, 0);
    analogWrite(BLUE_PIN, 0);
  }
  else if (lumina < THRESHOLD_MED) {
    analogWrite(RED_PIN, 0);
    analogWrite(GREEN_PIN, 255);
    analogWrite(BLUE_PIN, 0);
  }
  else {
    analogWrite(RED_PIN, 0);
    analogWrite(GREEN_PIN, 0);
    analogWrite(BLUE_PIN, 255);
  }
  
  delay(DELAY_TIME);
}