int LDRPin = 13; // LDR connected to analog pin A0
int LEDPin = 2; // LED connected to digital pin 13
int threshold = 500; // Threshold value for light level (adjust as needed)

#include <DHT.h>
#define DHT22_PIN 23 // ESP32 pin GPIO23 connected to DHT22
#define RELAY_PIN 18 // ESP32 pin GPIO18 connected to relay

#define DHT_SENSOR_TYPE DHT22

#define TEMP_UPPER_THRESHOLD 20// upper temperature threshold
#define TEMP_LOWER_THRESHOLD 20 // lower temperature threshold

DHT dht22(DHT22_PIN, DHT_SENSOR_TYPE);


void setup() {
  pinMode(LDRPin, INPUT); // Set LDR pin as input
  pinMode(LEDPin, OUTPUT); // Set LED pin as output
  Serial.begin(9600); // Initialize serial communication for debugging
    Serial.begin(9600); // initialize serial
  dht22.begin(); // initialize the DHT sensor
}

void loop() {
  int LDRValue = analogRead(LDRPin); // Read the value from the LDR
  Serial.println(LDRValue); // Print the LDR value to the Serial Monitor for debugging

  if (LDRValue < threshold) {
    // If the light level is below the threshold, turn on the LED
    digitalWrite(LEDPin, HIGH);
  } else {
    // If the light level is above the threshold, turn off the LED
    digitalWrite(LEDPin, LOW);
  }
  float temperature = dht22.readTemperature();; // read temperature in Celsius

if (isnan(temperature)) {
  Serial.println("Failed to read from DHT22 sensor!");
} else {
  if (temperature > TEMP_UPPER_THRESHOLD) {
    Serial.println("Turn the relay on");
    digitalWrite(RELAY_PIN, HIGH); // turn on
  } else if (temperature < TEMP_LOWER_THRESHOLD) {
    Serial.println("Turn the relay off");
    digitalWrite(RELAY_PIN, LOW); // turn off
  }
}

  delay(100); // Small delay for stability
}