const int pirPin = 2;       // PIR sensor pin (Motion Detector)
const int ldrPin = A0;      // LDR sensor pin (Light Sensor)
const int relayPin = 3;     // Relay pin (Controls Light)
const int lightThreshold = 400;  // Light level to determine brightness

void setup() {
  pinMode(pirPin, INPUT);   // PIR sensor as input
  pinMode(relayPin, OUTPUT); // Relay as output
  Serial.begin(9600);       // Start Serial Monitor
}

void loop() {
  int pirValue = digitalRead(pirPin);   // Read motion sensor (PIR)
  int ldrValue = analogRead(ldrPin);    // Read light sensor (LDR)

  // Check if the room is dark
  bool isDark = (ldrValue < lightThreshold);
  // Check if motion is detected
  bool motionDetected = (pirValue == HIGH);
  // Light should turn ON only if it's dark and motion is detected
  bool lightOn = (motionDetected && isDark);

  // Control the relay (turn light ON/OFF)
  digitalWrite(relayPin, lightOn ? HIGH : LOW);

  // Print status in a clean format
  Serial.print("LDR Value: "); Serial.print(ldrValue);
  Serial.print(isDark ? " (Low Light)" : " (Enough Light)");
  Serial.print(" | PIR: "); Serial.print(motionDetected ? "Motion Detected" : "No Motion Detected");
  Serial.print(" | Light "); Serial.println(lightOn ? "ON" : "OFF");

  delay(1000); // Wait 1 second before repeating
}