#include <OneWire.h>
#include <DallasTemperature.h>

// Define the pin numbers
const int LDR_PIN = 34;       // Pin connected to LDR (photoresistor)
const int LED_PIN = 26;       // Pin connected to LED
const int BUZZER_PIN = 25;    // Pin connected to buzzer
const int ONE_WIRE_BUS = 15;  // Pin connected to DS18B20 temperature sensor

// Define the threshold for LDR value (in lux)
const int LDR_THRESHOLD = 350; // Threshold value for turning on the LED and buzzer
const float TEMP_THRESHOLD = 55.0; // Threshold temperature (in Celsius)

// Initialize OneWire and DallasTemperature instances
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

void setup() {
  // Initialize the serial monitor for debugging
  Serial.begin(115200);

  // Set the LED and buzzer pins as outputs
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);

  // Ensure LED and buzzer are off initially
  digitalWrite(LED_PIN, LOW);
  digitalWrite(BUZZER_PIN, LOW);

  // Start communication with the DS18B20 sensor
  sensors.begin();
}

void loop() {
  // Read the LDR value (analog input)
  int ldrValue = analogRead(LDR_PIN);

  // Convert LDR value to Lux (simplified conversion)
  float voltage = (ldrValue / 4095.0) * 3.3;  // ESP32's max ADC value is 4095, and Vcc is 3.3V
  float lux = voltage * 1000;  // Approximation: Voltage * factor to get Lux value

  // Print the LDR value and lux to the Serial Monitor for debugging
  Serial.print("LDR Value: ");
  Serial.print(ldrValue);
  Serial.print(" | Lux: ");
  Serial.println(lux);

  // Request temperature reading from DS18B20
  sensors.requestTemperatures();
  float temperature = sensors.getTempCByIndex(0);  // Get temperature in Celsius from the first sensor

  // Print the temperature to the Serial Monitor
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" °C");

  // Check if the LDR value (in Lux) exceeds the threshold or temperature exceeds the threshold
  if (lux < LDR_THRESHOLD || temperature > TEMP_THRESHOLD) {
    // If Lux or temperature is above threshold, turn on the LED and buzzer
    digitalWrite(LED_PIN, HIGH);    // Turn on the LED
    digitalWrite(BUZZER_PIN, HIGH); // Turn on the buzzer
    Serial.println("ALERT: Lux or temperature exceeds threshold! LED and Buzzer ON.");
  } else {
    // If Lux and temperature are below threshold, turn off the LED and buzzer
    digitalWrite(LED_PIN, LOW);     // Turn off the LED
    digitalWrite(BUZZER_PIN, LOW);  // Turn off the buzzer
  }

  // Delay for a short period before reading again
  delay(500);  // Half second delay
}