#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BMP280.h>
#include <DHT.h>
#include <SPI.h>
#include <LoRa.h>

// Define BMP280
Adafruit_BMP280 bmp;

// Define DHT22
#define DHTPIN 15
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// Define MQ2
#define MQ2_PIN 34 // Analog pin connected to MQ2

// Define LoRa
#define LORA_SCK 18
#define LORA_MISO 19
#define LORA_MOSI 23
#define LORA_CS 5
#define LORA_RST 14
#define LORA_IRQ 26

void setup() {
  Serial.begin(115200);

  Wire.begin();
  // Initialize BMP280
  if (!bmp.begin(0x76)) {
    Serial.println("Could not find a valid BMP280 sensor, check wiring!");
    while (1);
  }

  // Initialize DHT22
  dht.begin();

  // Initialize LoRa
  SPI.begin(LORA_SCK, LORA_MISO, LORA_MOSI, LORA_CS);
  LoRa.setPins(LORA_CS, LORA_RST, LORA_IRQ);
  if (!LoRa.begin(433E6)) {
    Serial.println("Starting LoRa failed!");
    while (1);
  }
  Serial.println("LoRa Initialized!");
}

void loop() {
  // Read BMP280 data
  float pressure = bmp.readPressure() / 100.0F; // Convert to hPa
  float temperature_bmp = bmp.readTemperature(); // BMP temperature
  
  // Read DHT22 data
  float humidity = dht.readHumidity();
  float temperature_dht = dht.readTemperature();

  // Read MQ2 data
  int mq2Value = analogRead(MQ2_PIN);

  // Display readings on Serial Monitor
  Serial.println("================================");
  Serial.print("Pressure (hPa): ");
  Serial.println(pressure);
  Serial.print("Temperature (BMP280): ");
  Serial.println(temperature_bmp);
  Serial.print("Temperature (DHT22): ");
  Serial.println(temperature_dht);
  Serial.print("Humidity: ");
  Serial.println(humidity);
  Serial.print("Gas Value (MQ2): ");
  Serial.println(mq2Value);

  // Transmit data over LoRa
  LoRa.beginPacket();
  LoRa.print("Pressure: ");
  LoRa.print(pressure);
  LoRa.print(" hPa, Temp BMP280: ");
  LoRa.print(temperature_bmp);
  LoRa.print(" C, Temp DHT22: ");
  LoRa.print(temperature_dht);
  LoRa.print(" C, Humidity: ");
  LoRa.print(humidity);
  LoRa.print(" %, Gas: ");
  LoRa.print(mq2Value);
  LoRa.endPacket();

  // Wait for a while
  delay(2000);
}