#include <Servo.h>

const int ldrPin = A0;          // LDR module OUT pin connected to analog pin A0
const int servoPin = 9;         // Servo motor control pin (PWM pin)
const int trigPin = 7;          // Ultrasonic sensor TRIG pin
const int echoPin = 6;          // Ultrasonic sensor ECHO pin
const int ledPin = 4;           // LED control pin
const int buzzerPin = 5;        // Buzzer control pin

Servo myServo;                  // Create a servo object
bool ldrAlarmpartiallyactive = false;
bool ldrAlarmActive = false;    // Flag to indicate if the LDR alarm is active
bool ultrasonicAlarmActive = false; // Flag to indicate if the ultrasonic alarm is active

void setup() {
  pinMode(ldrPin, INPUT);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
  myServo.attach(servoPin);
}

void loop() {
  int lightIntensity = analogRead(ldrPin);
  int distance = getDistance();

  // Check LDR for light intensity
  if ( lightIntensity >500) {
    if (!ldrAlarmpartiallyactive) {
      activateLDRAlarmpartially();
    }
     else if(lightIntensity>2000){
      if(!ldrAlarmActive){
        activateLDRAlarm();
      }
    }
  } else  {
    if (ldrAlarmActive) {
      deactivateLDRAlarm();
    }
  }
  return(0);
  
  // Check ultrasonic sensor for nearby objects
  if (distance <= 200) {
    if (!ultrasonicAlarmActive) {
      activateUltrasonicAlarm();
    }
  } else {
    if (ultrasonicAlarmActive) {
      deactivateUltrasonicAlarm();
    }
  }
}

// Function to close the blinds
void closeBlinds() {
  myServo.write(0); // Rotate servo to close position
}
 
 void partiallyopenblinds(){
  myServo.write(90);//rotate servo to half open position
 }
// Function to open the blinds
void openBlinds() {
  myServo.write(180); // Rotate servo to open position
}

// Function to activate the LDR alarm
void activateLDRAlarm() {
  ldrAlarmActive = true;
  closeBlinds();
}
//function to partially deactivate ldr
void activateLDRAlarmpartially(){
  ldrAlarmpartiallyactive = true;
  partiallyopenblinds();
}
// Function to deactivate the LDR alarm
void deactivateLDRAlarm() {
  ldrAlarmActive = false;
  openBlinds();
}

// Function to activate the ultrasonic alarm
void activateUltrasonicAlarm() {
  ultrasonicAlarmActive = true;
  digitalWrite(ledPin, HIGH);    // Turn on LED
  tone(buzzerPin, 1000);         // Generate tone with buzzer
}

// Function to deactivate the ultrasonic alarm
void deactivateUltrasonicAlarm() {
  ultrasonicAlarmActive = false;
  digitalWrite(ledPin, LOW);     // Turn off LED
  delay(5000);                   // Wait for 5 seconds
  noTone(buzzerPin);             // Stop buzzer tone
}

// Function to get distance from ultrasonic sensor
int getDistance() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  return pulseIn(echoPin, HIGH) / 58;  // Convert pulse duration to distance in cm
}