#include <DHT.h>

#define LIGHT_SENSOR_PIN 4      // ESP32 pin GPIO4 (ADC0)
#define PIR_SENSOR_PIN 5        // Replace 5 with the actual pin number for PIR sensor
#define BUZZER_PIN 13           // Pin connected to the buzzer
#define TRIG_PIN 26             // Trigger pin of ultrasonic sensor (GPIO16)
#define ECHO_PIN 27             // Echo pin of ultrasonic sensor (GPIO17)
#define DISTANCE_THRESHOLD 30   // Distance threshold in centimeters for object detection

#define DHT_PIN 2              // Pin connected to DHT sensor (GPIO14)
#define DHT_TYPE DHT22          // DHT sensor type

DHT dht(DHT_PIN, DHT_TYPE);

void setup() {
  Serial.begin(9600);
  pinMode(PIR_SENSOR_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);   // Initialize buzzer pin as output
  pinMode(TRIG_PIN, OUTPUT);     // Initialize ultrasonic sensor trigger pin as output
  pinMode(ECHO_PIN, INPUT);      // Initialize ultrasonic sensor echo pin as input

  dht.begin();  // Initialize DHT sensor
}

void loop() {
  int analogValue = analogRead(LIGHT_SENSOR_PIN);
  bool motionDetected = false;
  bool objectDetected = false;

  // Check PIR sensor for motion detection
  if (digitalRead(PIR_SENSOR_PIN) == HIGH) {
    Serial.println("Motion detected by PIR sensor!");
    motionDetected = true;
    soundBuzzer(); // Function to sound the buzzer
  }

  // Check ultrasonic sensor for object detection
  long duration, distance;
  digitalWrite(TRIG_PIN, LOW);    // Ensure the trigger pin is low
  delayMicroseconds(2);           // Short delay
  digitalWrite(TRIG_PIN, HIGH);   // Send 10 microsecond pulse to trigger
  delayMicroseconds(10);          // Delay
  digitalWrite(TRIG_PIN, LOW);    // Turn off trigger pulse

  duration = pulseIn(ECHO_PIN, HIGH); // Read echo pulse
  distance = duration * 0.034 / 2;    // Calculate distance in centimeters

  if (distance <= DISTANCE_THRESHOLD) {
    Serial.print("Object detected at ");
    Serial.print(distance);
    Serial.println(" cm");
    objectDetected = true;

    // Check temperature with DHT sensor
    float temperature = dht.readTemperature(); // Read temperature in Celsius
    if (!isnan(temperature) && temperature > 30.0) { // Check if temperature is valid and high
      soundHighTemperatureTone(); // Function to sound music-like tone for high temperature
    } else {
      soundBuzzer(); // Default function to sound the buzzer
    }
  }

  // Output analog light value
  Serial.print("Analog Value = ");
  Serial.print(analogValue);

  if (analogValue < 40) {
    Serial.println(" => Dark");
  } else if (analogValue < 800) {
    Serial.println(" => Dim");
  } else if (analogValue < 2000) {
    Serial.println(" => Light");
  } else if (analogValue < 3200) {
    Serial.println(" => Bright");
  } else {
    Serial.println(" => Very bright");
  }

  delay(500);
}

void soundBuzzer() {
  tone(BUZZER_PIN, 1500); // Sound the buzzer at 1500 Hz
  delay(1000);             // Tone duration
  noTone(BUZZER_PIN);     // Ensure buzzer is silent
}

void soundHighTemperatureTone() {
  tone(BUZZER_PIN, 2000); // Sound a higher pitch tone (example)
  delay(200);             // Tone duration
  noTone(BUZZER_PIN);     // Ensure buzzer is silent
}