// Define pins
int PIR = 13;    // PIR sensor pin
int LDR = A0;    // LDR sensor pin (analog input)
int R = 6;       // Red LED pin
int G = 5;       // Green LED pin
int B = 3;       // Blue LED pin

// Threshold for the LDR sensor (adjust based on environment)
int ldrThreshold = 632;  // Higher value means it's darker

void setup() {
  // Initialize the Serial Monitor
  Serial.begin(115200);

  // Set PIR pin as input
  pinMode(PIR, INPUT);

  pinMode(R, OUTPUT);
  pinMode(G, OUTPUT);
  pinMode(B, OUTPUT);

  // Turn off the RGB LED initially
  digitalWrite(R, LOW);
  digitalWrite(G, LOW);
  digitalWrite(B, LOW);
}

void loop() {
  // Read PIR sensor value
  int movement = digitalRead(PIR);

  // Read LDR sensor value (analog)
  int ldrValue = analogRead(LDR);

  // Only proceed if motion is detected
  if (movement == HIGH) {
    // Check if LDR detects low light (above the threshold means it's dark)
    if (ldrValue > ldrThreshold) {
      // Turn on the RGB LED to white (red, green, blue all HIGH)
      digitalWrite(R, HIGH);
      digitalWrite(G, HIGH);
      digitalWrite(B, HIGH);
      Serial.println("Motion detected and it's dark - turning on the light.");
    } else {
      // It's not dark, so keep the LED off
      digitalWrite(R, LOW);
      digitalWrite(G, LOW);
      digitalWrite(B, LOW);
      Serial.println("Motion detected but enough light - light off.");
    }
  } else {
    // No motion detected, keep the LED off
    digitalWrite(R, LOW);
    digitalWrite(G, LOW);
    digitalWrite(B, LOW);
    Serial.println("No motion - light off.");
  }

  // Small delay to avoid excessive readings
  delay(500);
}