#include "Arduino.h"

// Define pin numbers
const int LDR_PIN = A0;       // LDR analog pin connected to A0
const int SERVO_PIN = A1;    // Servo signal pin connected to PA1
const int PIR_PIN = A2;      // PIR motion sensor pin connected to PA2
const int RELAY_PIN = A3;    // Relay pin connected to PA3

// Threshold for flame detection (adjust based on your testing)
const int LDR_THRESHOLD = 500; //


const int OFF_POSITION = 0;    // PWM value for extreme right (off state)
const int ON_POSITION = 90;     // PWM value for desired on position (example)

// Timer variables
unsigned long motionDetectedTime = 0;
const unsigned long LIGHT_OFF_DELAY = 10000; // Time  to turn off light (10 seconds)

void setup() {
  pinMode(SERVO_PIN, OUTPUT);
  pinMode(PIR_PIN, INPUT);      
  pinMode(RELAY_PIN, OUTPUT);    
  Serial.begin(9600); // 

  // Start the servo in the off position
  analogWrite(SERVO_PIN, OFF_POSITION);
  digitalWrite(RELAY_PIN, HIGH); // Turn off the relay initially (active LOW relay)
}

void loop() {
  // Read the LDR value
  int ldrValue = analogRead(LDR_PIN);
  Serial.print("LDR Value: ");
  Serial.println(ldrValue); // Print LDR value for debugging

  // Check if flame (light) is detected
  if (ldrValue > LDR_THRESHOLD) {
    // Flame detected, do nothing
    analogWrite(SERVO_PIN, OFF_POSITION);  // Ensure servo stays in off position
  } else {
    // Flame not detected, move servo to the on position
    analogWrite(SERVO_PIN, ON_POSITION);  // Move to the desired position
  }

  // Check for motion
  int motionState = digitalRead(PIR_PIN);
  if (motionState == HIGH) {
    // Motion detected, reset the timer and turn on the light
    motionDetectedTime = millis();
    digitalWrite(RELAY_PIN, LOW); // Turn on the light (active LOW)
    Serial.println("Motion Detected: Light ON");
  } else {
    // No motion detected, check the timer
    if (millis() - motionDetectedTime > LIGHT_OFF_DELAY) {
      digitalWrite(RELAY_PIN, HIGH); // Turn off the light (active LOW)
      Serial.println("No Motion: Light OFF");
    }
  }

  // Control the LED based on the relay state
  if (digitalRead(RELAY_PIN) == LOW) {
    // Relay is on (light is on)
    digitalWrite(LED_BUILTIN, HIGH); // Turn LED on
  } else {
    // Relay is off (light is off)
    digitalWrite(LED_BUILTIN, LOW); // Turn LED off
  }

  // Delay for stability
  delay(100);
}