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	- Project: "Temperature Monitoring"
	- Source Code NOT compiled for: Arduino Nano ESP32
	- Source Code created on: 2024-10-02 20:37:17

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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

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
void initializeLCD(); // Function to initialize the LCD
void updateLCDDisplay(); // Function to update LCD display with temperature
void sendTemperature(); // Function to send temperature via Bluetooth

/***** DEFINITION OF DIGITAL INPUT PINS *****/
const uint8_t temp_DS18B20_DQ_PIN_D8 = 8; // Pin for DS18B20
const uint8_t temperatureSensor_DHT22_DOUT_PIN_D9 = 9; // Pin for DHT22

/***** 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*****/

// Initialize the LCD
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);

// Initialize the OLED display with the correct I2C address
#define OLED_RESET -1 // Define reset pin as -1 since it is not used
Adafruit_SSD1306 display(OLED_RESET); // Create an instance of the Adafruit_SSD1306 class

// Initialize U8g2_for_Adafruit_GFX object with the display instance
U8G2_FOR_ADAFRUIT_GFX u8g2_for_adafruit_gfx; // Create an instance of the U8G2_FOR_ADAFRUIT_GFX class

// Initialize DS18B20 object with the correct pin
DS18B20 ds(temp_DS18B20_DQ_PIN_D8); // Create an instance of DS18B20 on pin D8

// Initialize DHT object with the correct pin and type
#define DHTTYPE DHT22   // Define the type of DHT sensor
DHT dht(temperatureSensor_DHT22_DOUT_PIN_D9, DHTTYPE); // Create an instance of the DHT class

void setup(void)
{
	// put your setup code here, to run once:

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

	pinMode(display_LCD1602_RS_PIN_D2, OUTPUT);
	pinMode(display_LCD1602_E_PIN_D3, OUTPUT);
	pinMode(display_LCD1602_D4_PIN_D4, OUTPUT);
	pinMode(display_LCD1602_D5_PIN_D5, OUTPUT);
	pinMode(display_LCD1602_D6_PIN_D6, OUTPUT);
	pinMode(display_LCD1602_D7_PIN_D7, OUTPUT);

	// Initialize the OLED display
	display.begin(SSD1306_SWITCHCAPVCC, myOledDisplay_SSD1306OledDisplay_I2C_SLAVE_ADDRESS);
	display.display(); // Show initial display
	delay(2000);
	display.clearDisplay(); // Clear the display

	// Initialize the U8g2_for_Adafruit_GFX library
	u8g2_for_adafruit_gfx.begin(display); // Initialize U8g2 with the Adafruit display

	initializeLCD(); // Initialize the LCD display

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

	// Initialize Bluetooth communication
	Serial.begin(9600); // Start serial communication for Bluetooth
}

void loop(void)
{
	// put your main code here, to run repeatedly:

	updateLCDDisplay(); // Update LCD display with temperature
	sendTemperature(); // Send temperature data via Bluetooth
}

void updateLCDDisplay()
{
	// Read temperature from DHT sensor
	float temperature = dht.readTemperature();
	if (!isnan(temperature)) {
		// Update the LCD display with the temperature
		lcd.clear();
		lcd.print("Temp: ");
		lcd.print(temperature);
		lcd.print(" C");
		lcd.display();
	}
}

void sendTemperature()
{
	// Read temperature from DHT sensor
	float temperature = dht.readTemperature();
	if (!isnan(temperature)) {
		// Send temperature via Bluetooth (assuming Serial is used for Bluetooth)
		Serial.print("Temperature: ");
		Serial.println(temperature);
	}
}

/* END CODE */