int ldrPin = A0;

int redPin = 2;
int greenPin = 3;
int bluePin = 4;

int buzzerPin = 5; // Connect your buzzer to pin 5

void setup() {
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  int lightValue = analogRead(ldrPin); // 0 (dark) → 1023 (bright)

  Serial.println(lightValue);

  // Map light reading to colors
  int redValue   = map(lightValue, 0, 1023, 255, 0);   
  int greenValue = map(lightValue, 0, 1023, 0, 255);   
  int blueValue  = map(lightValue, 300, 1023, 0, 255); 

  // Limit values
  redValue   = constrain(redValue, 0, 255);
  greenValue = constrain(greenValue, 0, 255);
  blueValue  = constrain(blueValue, 0, 255);

  // Write to RGB LED (common cathode → HIGH = ON)
  analogWrite(redPin,   redValue);
  analogWrite(greenPin, greenValue);
  analogWrite(bluePin,  blueValue);

  // Buzzer alarm if it's dark
  if(lightValue < 200){  // Threshold for darkness
    tone(buzzerPin, 1000); // Play 1kHz tone
  } else {
    noTone(buzzerPin);     // Stop buzzer if enough light
  }

  delay(20);
}