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	- Project: Temperature Monitor
	- Source Code NOT compiled for: Arduino Nano ESP32
	- Source Code created on: 2024-10-03 10:56:08

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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 <Wire.h>
#include <LiquidCrystal.h>  // Library for controlling LCD displays
#include <DS18B20.h>        // Library for DS18B20 temperature sensor
#include <DHT.h>            // Library for DHT temperature and humidity sensors
#include <BluetoothSerial.h> // Library for Bluetooth communication

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

/***** 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; // LCD RS pin
const uint8_t display_LCD1602_E_PIN_D3 = 3;  // LCD Enable pin
const uint8_t display_LCD1602_D4_PIN_D4 = 4;  // LCD D4 pin
const uint8_t display_LCD1602_D5_PIN_D5 = 5;  // LCD D5 pin
const uint8_t display_LCD1602_D6_PIN_D6 = 6;  // LCD D6 pin
const uint8_t display_LCD1602_D7_PIN_D7 = 7;  // LCD D7 pin

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
// Create instances for the libraries
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 temperatureSensor(temp_DS18B20_DQ_PIN_D8); // DS18B20 instance
DHT dht(temperatureSensor_DHT22_DOUT_PIN_D9, DHT22); // DHT22 instance
BluetoothSerial SerialBT; // Bluetooth Serial instance

void setup(void)
{
    // Initialize serial communication for debugging
    Serial.begin(115200);
    SerialBT.begin("ESP32_BT"); // Initialize Bluetooth with device name

    // Initialize the LCD
    lcd.begin(16, 2);
    lcd.print("Initializing...");

    // Initialize temperature sensors
    temperatureSensor.begin();
    dht.begin();

    // Display initial message on LCD
    lcd.clear();
    lcd.print("Ready");
}

void loop(void)
{
    // Read temperature from DHT sensor
    float temperature = dht.readTemperature();
    if (isnan(temperature)) {
        lcd.print("DHT Error");
    } else {
        // Display temperature on LCD
        lcd.setCursor(0, 0);
        lcd.print("Temp: ");
        lcd.print(temperature);
        lcd.print(" C");

        // Send temperature via Bluetooth
        sendTemperature(temperature);
    }

    // Read temperature from DS18B20 sensor
    float dsTemp = temperatureSensor.getTempC();
    if (!isnan(dsTemp)) {
        // Display DS18B20 temperature on LCD
        lcd.setCursor(0, 1);
        lcd.print("DS Temp: ");
        lcd.print(dsTemp);
        lcd.print(" C");
        
        // Send DS18B20 temperature via Bluetooth
        sendTemperature(dsTemp);
    } else {
        lcd.setCursor(0, 1);
        lcd.print("DS Error");
    }

    delay(2000); // Wait for 2 seconds before next reading
}

void updateOutputs()
{
    // Update the LCD display with the latest readings
    lcd.display();
}

void sendTemperature(float temperature) {
    // Format temperature data as a string
    String tempData = "Temperature: " + String(temperature) + " C";
    SerialBT.println(tempData); // Send temperature data via Bluetooth
}