// Pin definitions
#define PIR_PIN 26           // PIR sensor pin (motion detection)
#define LDR_PIN 34           // LDR sensor pin (ambient light detection, must be an analog-capable pin on ESP32)
#define LIGHT_PIN 25        // Light control pin (for LED or relay to control a light)

// Thresholds and timeout settings
const int lightThreshold = 500;     // Adjust based on ambient light level needed to turn on the light
const unsigned long motionTimeout = 10000; // 30 seconds without motion to turn off light

// Variables for tracking state
unsigned long lastMotionTime = 0;   // Last time motion was detected
bool lightOn = false;               // Track if the light is currently on

void setup() {
  Serial.begin(115200);
  
  pinMode(PIR_PIN, INPUT);          // Set PIR sensor as input
  pinMode(LDR_PIN, INPUT);          // Set LDR sensor as input
  pinMode(LIGHT_PIN, OUTPUT);       // Set light control pin as output
  digitalWrite(LIGHT_PIN, LOW);     // Start with light turned off

  Serial.println("Smart Light System Initialized");
}

void loop() {
  // Read the PIR sensor to detect motion
  int pirState = digitalRead(PIR_PIN);

  // Read the LDR sensor for ambient light level
  int ldrValue = analogRead(LDR_PIN);

  // Print readings to Serial Monitor
  Serial.print("PIR State: ");
  Serial.print(pirState);
  Serial.print(" | LDR Value: ");
  Serial.println(ldrValue);

  // Check if motion is detected and ambient light is below threshold
  if (pirState == HIGH && ldrValue < lightThreshold) {
    lastMotionTime = millis();  // Update last motion detection time
    if (!lightOn) {
      digitalWrite(LIGHT_PIN, HIGH); // Turn on the light
      lightOn = true;
      Serial.println("Light ON");
    }
  }

  // Check if the light should be turned off due to no motion
  if (lightOn && (millis() - lastMotionTime > motionTimeout)) {
    digitalWrite(LIGHT_PIN, LOW);  // Turn off the light
    lightOn = false;
    Serial.println("Light OFF");
  }

  delay(500);  // Adjust delay as needed
}