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	- Project: Temperature Monitor
	- Source Code NOT compiled for: Arduino Nano ESP32
	- Source Code created on: 2024-10-03 09:55:41

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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

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
void updateOutputs();
void readAndDisplayTemperature();
void sendTemperatureViaBluetooth(float temperature);

/***** 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 OUTPUT RAW VARIABLES *****/
bool display_LCD1602_RS_PIN_D2_rawData = 0;
bool display_LCD1602_E_PIN_D3_rawData = 0;
bool display_LCD1602_D4_PIN_D4_rawData = 0;
bool display_LCD1602_D5_PIN_D5_rawData = 0;
bool display_LCD1602_D6_PIN_D6_rawData = 0;
bool display_LCD1602_D7_PIN_D7_rawData = 0;

/***** DEFINITION OF OUTPUT PHYSICAL VARIABLES *****/
float display_LCD1602_RS_PIN_D2_phyData = 0.0;
float display_LCD1602_E_PIN_D3_phyData = 0.0;
float display_LCD1602_D4_PIN_D4_phyData = 0.0;
float display_LCD1602_D5_PIN_D5_phyData = 0.0;
float display_LCD1602_D6_PIN_D6_phyData = 0.0;
float display_LCD1602_D7_PIN_D7_phyData = 0.0;

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
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);
DS18B20 tempSensor(temp_DS18B20_DQ_PIN_D8);
DHT dht(temperatureSensor_DHT22_DOUT_PIN_D9, DHT22);
BluetoothSerial SerialBT; // Create Bluetooth Serial object

void setup(void)
{
    // Initialize pins
    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 LCD and sensors
    lcd.begin(16, 2); // Initialize the LCD
    dht.begin(); // Initialize the DHT sensor
    tempSensor.begin(); // Initialize the DS18B20 sensor

    // Initialize Bluetooth
    SerialBT.begin("ESP32_Bluetooth"); // Name of the Bluetooth device
}

void loop(void)
{
    // Refresh output data
    updateOutputs();
    // Read temperature and display it
    readAndDisplayTemperature();
}

void updateOutputs()
{
    digitalWrite(display_LCD1602_RS_PIN_D2, display_LCD1602_RS_PIN_D2_rawData);
    digitalWrite(display_LCD1602_E_PIN_D3, display_LCD1602_E_PIN_D3_rawData);
    digitalWrite(display_LCD1602_D4_PIN_D4, display_LCD1602_D4_PIN_D4_rawData);
    digitalWrite(display_LCD1602_D5_PIN_D5, display_LCD1602_D5_PIN_D5_rawData);
    digitalWrite(display_LCD1602_D6_PIN_D6, display_LCD1602_D6_PIN_D6_rawData);
    digitalWrite(display_LCD1602_D7_PIN_D7, display_LCD1602_D7_PIN_D7_rawData);
}

void readAndDisplayTemperature()
{
    float temperature = dht.readTemperature(); // Read temperature from DHT sensor
    if (isnan(temperature)) {
        lcd.print("Error reading temp");
    } else {
        lcd.setCursor(0, 0);
        lcd.print("Temp: ");
        lcd.print(temperature);
        lcd.print(" C");
        sendTemperatureViaBluetooth(temperature); // Send temperature via Bluetooth
    }
}

void sendTemperatureViaBluetooth(float temperature)
{
    // Send temperature data via Bluetooth
    SerialBT.print("Temperature: ");
    SerialBT.print(temperature);
    SerialBT.println(" C");
}