Temperature Display rev_17

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    - Project: Temperature Display
    - Source Code NOT compiled for: Arduino Nano ESP32
    - Source Code created on: 2024-10-02 22:30:42

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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 *****/


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/****** DEFINITION OF LIBRARIES *****/
#include <Wire.h>
#include <LiquidCrystal.h>  //https://github.com/arduino-libraries/LiquidCrystal
#include <DS18B20.h>    //https://github.com/matmunk/DS18B20
#include <Adafruit_SSD1306.h>   //https://github.com/stblassitude/Adafruit_SSD1306_Wemos_OLED.git
#include <U8g2_for_Adafruit_GFX.h>  //https://github.com/olikraus/U8g2_for_Adafruit_GFX
#include <DHT.h>    //https://github.com/adafruit/DHT-sensor-library

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

/***** 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*****/
// Initialize the Adafruit SSD1306 display object with the correct I2C address
Adafruit_SSD1306 display(myOledDisplay_SSD1306OledDisplay_I2C_SLAVE_ADDRESS, myOledDisplay_SSD1306OledDisplay_I2C_PIN_SDA_A4, myOledDisplay_SSD1306OledDisplay_I2C_PIN_SCL_A5);

// Initialize U8g2_for_Adafruit_GFX object
U8G2_FOR_ADAFRUIT_GFX u8g2_for_adafruit_gfx; // Create an instance of U8g2_for_Adafruit_GFX

// Initialize DS18B20 object with the correct pin
DS18B20 ds(temp_DS18B20_DQ_PIN_D8); // Using the defined pin for DS18B20

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

// Initialize the LiquidCrystal display object
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);

void setup(void)
{
    // Initialize Serial for Bluetooth communication
    Serial.begin(9600);

    // Set pin modes
    pinMode(temp_DS18B20_DQ_PIN_D8, INPUT);
    pinMode(temperatureSensor_DHT22_DOUT_PIN_D9, INPUT_PULLUP);

    // Initialize the LCD display
    lcd.begin(16, 2); // Set up the LCD's number of columns and rows
    lcd.print("Initializing...");

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

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

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

void loop(void)
{
    // Update outputs and read temperature to send via Bluetooth
    updateOutputs(); // Refresh output data
    readTemperatureAndSend(); // Read temperature and send via Bluetooth
}

void updateOutputs()
{
    // Update the LCD display with the latest data
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Temp: ");
    lcd.print(dht.readTemperature());
    lcd.print(" C");
    lcd.setCursor(0, 1);
    lcd.print("Humidity: ");
    lcd.print(dht.readHumidity());
    lcd.print(" %");
}

void readTemperatureAndSend()
{
    // Read temperature from DHT22 sensor
    float temperature = dht.readTemperature();
    float humidity = dht.readHumidity();

    // Check if the readings are valid
    if (isnan(temperature) || isnan(humidity)) {
        Serial.println("Failed to read from DHT sensor!");
        return;
    }

    // Send temperature data via Bluetooth
    Serial.print("Temperature: ");
    Serial.println(temperature);
    Serial.print("Humidity: ");
    Serial.println(humidity);
}

/* END CODE */