#include <DHTesp.h>
#include <ESP32Servo.h>

// Constants for DHT sensor
const int DHT_PIN = 15;

// Constants for photoresistor calibration
const float GAMMA = 0.7;
const float RL10 = 50;

// Constants for PIR sensor
const int LED_PIN = 5;
const int PIR_INPUT_PIN = 19;
int pirState = LOW; // Variable to store the current state of PIR sensor

// Define the pin connected to the photoresistor
const int PHOTO_RESISTOR_PIN = 2; // Adjust according to your setup

// Define servo related constants
#define ServoPin (33)
#define vrPin (34)
unsigned int ADCmin = 0;
unsigned int ADCmax = 4095;
unsigned int POSmin = 0;
unsigned int POSmax = 180;

#define ADC analogRead(vrPin)

// Creating an instance of the DHTesp class
DHTesp dhtSensor;
Servo myServo;

void setup() {
  // Initializing serial communication
  Serial.begin(115200);

  // Configuring the DHT sensor
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);

  // Set pinMode for LED, PIR sensor, and photoresistor pin
  pinMode(LED_PIN, OUTPUT);
  pinMode(PIR_INPUT_PIN, INPUT);

  // Attaching the servo to its pin
  myServo.attach(ServoPin);
}

void loop() {
  // Reading temperature and humidity from DHT sensor
  TempAndHumidity data = dhtSensor.getTempAndHumidity();

  // Printing temperature and humidity
  Serial.print("Temperature: ");
  Serial.print(data.temperature, 2); // Two decimal places for temperature
  Serial.println(" °C");

  Serial.print("Humidity: ");
  Serial.print(data.humidity, 1); // One decimal place for humidity
  Serial.println("%");

  // Reading analog value from photoresistor pin
  int analogValue = analogRead(PHOTO_RESISTOR_PIN);

  // Convert analog value to voltage (assuming 12-bit ADC and 3.3V reference)
  float voltage = analogValue / 4095.0 * 3.3;

  // Calculate resistance of the photoresistor using voltage divider formula
  float resistance = 2000 * voltage / (3.3 - voltage);

  // Calculate lux using the resistance and predefined calibration values
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));

  // Print the lux value
  Serial.print("Lux: ");
  Serial.println(lux / 10);

  // Reading state of PIR sensor
  const int PIR_STATE = digitalRead(PIR_INPUT_PIN);

  if (PIR_STATE == HIGH) {
    digitalWrite(LED_PIN, HIGH);
    if (pirState == LOW) {
      Serial.println("Motion detected!");
      pirState = HIGH;
    }
    delay(1000);
  } else {
    digitalWrite(LED_PIN, LOW);
    if (pirState == HIGH) {
      Serial.println("Motion ended!");
      pirState = LOW;
    }
    delay(1000);
  }

  // Servo control based on potentiometer input
  int pos = map(ADC ,ADCmin ,ADCmax ,POSmin ,POSmax);
  myServo.write(pos);
}