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	- Project: Climate Monitor
	- Source Code NOT compiled for: Arduino Nano ESP32
	- Source Code created on: 2024-10-02 21:26:13

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
	/* Initialize internal Bluetooth device as master, */
	/* receive BLE data, and show it on a 16x2 LCD using */
	/* LiquidCrystal library for Arduino. */
/****** SYSTEM REQUIREMENT 2 *****/
	/* read temperature and send it via bluetooth. */
/****** END SYSTEM REQUIREMENTS *****/

/****** DEFINITION OF LIBRARIES *****/
#include 
#include     // https://github.com/arduino-libraries/LiquidCrystal
#include           // https://github.com/matmunk/DS18B20
#include  // https://github.com/stblassitude/Adafruit_SSD1306_Wemos_OLED.git
#include  // https://github.com/olikraus/U8g2_for_Adafruit_GFX
#include               // https://github.com/adafruit/DHT-sensor-library
#include    // Include Bluetooth Serial library
#include "LiquidCrystalDisplay.h" // Include the header file for LCD
#include "AdafruitSSD1306Display.h" // Include the header file for OLED display
#include "DHTSensor.h" // Include the header file for DHT sensor

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);

/***** DEFINITION OF DIGITAL INPUT PINS *****/
const uint8_t temp_DS18B20_DQ_PIN_D8 = 8;
const uint8_t temperatureSensor_DHT22_DOUT_PIN_D9 = 9;

/***** DEFINITION OF DIGITAL OUTPUT PINS *****/
const uint8_t display_LCD1602_RS_PIN_D2 = 2;
const uint8_t display_LCD1602_E_PIN_D3 = 3;
const uint8_t display_LCD1602_D4_PIN_D4 = 4;
const uint8_t display_LCD1602_D5_PIN_D5 = 5;
const uint8_t display_LCD1602_D6_PIN_D6 = 6;
const uint8_t display_LCD1602_D7_PIN_D7 = 7;

/***** DEFINITION OF I2C PINS *****/
const uint8_t myOledDisplay_SSD1306OledDisplay_I2C_PIN_SDA_A4 = A4;
const uint8_t myOledDisplay_SSD1306OledDisplay_I2C_PIN_SCL_A5 = A5;
const uint8_t myOledDisplay_SSD1306OledDisplay_I2C_SLAVE_ADDRESS = 60;

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/

// Create an instance of the DS18B20 class using the appropriate pin
DS18B20 ds(temp_DS18B20_DQ_PIN_D8);

// Initialize the OLED display using the Adafruit_SSD1306 library
Adafruit_SSD1306 display(myOledDisplay_SSD1306OledDisplay_I2C_SLAVE_ADDRESS, myOledDisplay_SSD1306OledDisplay_I2C_PIN_SDA_A4, myOledDisplay_SSD1306OledDisplay_I2C_PIN_SCL_A5);

// Create an instance of the DHT class
DHT dht(temperatureSensor_DHT22_DOUT_PIN_D9, DHT22); // Initialize DHT sensor

// Create an instance of the LiquidCrystal class
LiquidCrystal lcd(display_LCD1602_RS_PIN_D2, display_LCD1602_E_PIN_D3, display_LCD1602_D4_PIN_D4, display_LCD1602_D5_PIN_D5, display_LCD1602_D6_PIN_D6, display_LCD1602_D7_PIN_D7);

// Create an instance of the BluetoothSerial class
BluetoothSerial SerialBT;

void setup(void)
{
    Serial.begin(9600); // Initialize serial communication for debugging
    SerialBT.begin("ESP32_Bluetooth"); // Initialize Bluetooth with device name

    pinMode(temp_DS18B20_DQ_PIN_D8, INPUT);
    pinMode(temperatureSensor_DHT22_DOUT_PIN_D9, INPUT_PULLUP);

    // Initialize the LCD
    lcd.begin(16, 2); // Set the dimensions of the LCD (16 columns and 2 rows)
    lcd.print("Initializing..."); // Print a message to the LCD

    // Initialize the OLED display
    display.begin(SSD1306_SWITCHCAPVCC, myOledDisplay_SSD1306OledDisplay_I2C_SLAVE_ADDRESS);
    display.clearDisplay(); // Clear the display
    display.display(); // Update the display

    // Initialize the DHT sensor
    dht.begin(); // Start the DHT sensor
}

void loop(void)
{
    // Read temperature and humidity from DHT sensor
    float h = dht.readHumidity();
    float t = dht.readTemperature();

    // Check if any reads failed and exit early (to try again).
    if (isnan(h) || isnan(t)) {
        Serial.println("Failed to read from DHT sensor!");
        return;
    }

    // Display temperature and humidity on the LCD
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Temp: ");
    lcd.print(t);
    lcd.print(" C");
    lcd.setCursor(0, 1);
    lcd.print("Humidity: ");
    lcd.print(h);
    lcd.print(" %");

    // Send temperature data via Bluetooth
    SerialBT.print("Temperature: ");
    SerialBT.print(t);
    SerialBT.println(" C");

    // Delay for a while before the next loop
    delay(2000); // Delay for 2 seconds
}