#include <Wire.h> //For I2C 

#include <OneWire.h> //for DS18B20
#include <DS18B20_INT.h> //for DS18B20

#include <Adafruit_GFX.h> //for SSD1306 OLED
#include <Adafruit_SSD1306.h> //for SSD1306 OLED

#define DHT_NODE_ADDRESS 1 // I2C address of the DHT22 node module
#define MQ2_NODE_ADDRESS 2 // I2C address of the MQ2 node module

#define ONE_WIRE_BUS 21 // Pin for DS18B20 sensor

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

OneWire oneWire(ONE_WIRE_BUS); //for DS18B20
DS18B20_INT sensor(&oneWire); //for DS18B20

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

int temperature, humidity, gasValue, soilTemp;

void setup() {
  Wire.begin();        // join i2c bus (address optional for master)
  Serial.begin(115200);  // start serial for output

  sensor.begin(); //begin DS18B20 sensor

  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  delay(2000);
  display.clearDisplay();
}

void loop() {

  sensor.requestTemperatures(); // get temperature from DS18B20
  while (!sensor.isConversionComplete());  // (BLOCKING!!) wait until sensor is ready

  soilTemp = sensor.getTempC();

/*
  Serial.print("Temp: ");
  Serial.println(sensor.getTempC());
*/

  
  // Request data from the DHT22 sensor node
  Wire.requestFrom(DHT_NODE_ADDRESS, sizeof(int) * 2); // Request 2 integers
  if (Wire.available() >= sizeof(int) * 2) {
    
    temperature = Wire.read();
    humidity = Wire.read();

/*
    // Process and display the received data from DHT22
    Serial.print("DHT22 - Temperature: ");
    Serial.print(temperature);
    Serial.print(" °C, Humidity: ");
    Serial.print(humidity);
    Serial.println(" %");
*/
  }

  // Request data from the MQ2 gas sensor node
  Wire.requestFrom(MQ2_NODE_ADDRESS, sizeof(int)); // Request 1 integer

  if (Wire.available() >= sizeof(int)) {
    
    gasValue = Wire.read();

/*
    // Process and display the received data from MQ2 gas sensor
    Serial.print("MQ2 Gas Sensor - Gas Value: ");
    Serial.println(gasValue);
*/
  }

  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0, 0);
  // Display static text
  display.println("Air Temperature:");
  display.setCursor(100, 8);
  display.println(temperature);
  display.setCursor(0, 8);

  // Display static text
    display.println("Air Humidity");

  display.setCursor(100, 8);
  display.println(humidity);

  // Display static text
  display.setCursor(0, 16);
  display.println("Gas Value: ");
  display.setCursor(100, 16);

  // Display static text
  display.println(gasValue);
    display.setCursor(100, 32);

  // Display static text
  display.println(gasValue);
  display.display(); 


  delay(1000);
}