Sensor Communication rev_47

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    - Project: Sensor Communication
    - Source Code NOT compiled for: Arduino Nano ESP32
    - Source Code created on: 2025-07-05 00:56:58

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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 *****/

/* START CODE */

/****** DEFINITION OF LIBRARIES *****/
#include <Wire.h>
#include <LiquidCrystal.h>  //https://github.com/arduino-libraries/LiquidCrystal
#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
#include <BluetoothSerial.h> // For Bluetooth

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

/***** 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;

/***** DECLARATION OF OBJECT INSTANCES *****/
// Instantiate the Bluetooth serial object
BluetoothSerial SerialBT;

// Instantiate DHT sensor object; assuming DHT22 at pin 9
DHT dht(temperatureSensor_DHT22_DOUT_PIN_D9, DHT::DHT22);

// Instantiate SSD1306 OLED display object (using I2C)
Adafruit_SSD1306 display(A4, A5);

/****** SETUP PROCEDURE ******/
void setup(void)
{
    // Initialize Bluetooth as master, and enable receive mode
    SerialBT.begin("NanoESP32_BLE_Master"); // Name of Bluetooth device

    // Setup pin modes for digital I/O
    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 DHT sensor
    dht.begin();

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

    // Send initial temperature via Bluetooth every cycle
    Bluetooth_sendTemperature();

    // Display WiFi message on LCD
    // For placeholder, just show message
    // The sequence functionality is minimal to focus on core system
}

/****** LOOP PROCEDURE ******/
void loop(void)
{
    // Receive data over BLE (e.g., screen commands)
    Bluetooth_receiveData();

    // Read temperature sensors
    float tempC = dht.readTemperature(); // Celsius

    // Send temperature data via BLE
    Bluetooth_sendTemperature();

    // Show temperature on LCD
    // Using a simplified display update, when data is available
    // Update LCD with temperature
    String tempString = "Temp:" + String(tempC,2) + " C";
    // Write to LCD considering system architecture if needed
    // For simplicity, assume 16x2 LCD
    for (uint8_t i = 0; i < 16 && i < tempString.length(); i++) {
        digitalWrite(display_LCD1602_RS_PIN_D2, HIGH); // set register select high for data
        digitalWrite(display_LCD1602_E_PIN_D3, LOW);
        // set data pins based on character bits
        // Implemented depends on actual LCD wiring; here incar placeholder
        // For dynamics, we'll assume the RS/ E signal directly controls the display and leave far PIDs unspecified
        // Alternatively, pre-implemented functions would be invoked here.
        updateOutputs(); // placeholder for display update
    }
    delay(1000);
}

/****** BLE Callback Function: Receive Data ******/
void Bluetooth_receiveData()
{
    if (SerialBT.available()) {
        String incomingData = SerialBT.readString();
        // Process incoming BLE data, e.g., change display message, toggle LEDs etc.
        // For demonstration, show it on OLED
        display.clearDisplay();
        display.setCursor(0,0);
        display.println(incomingData);
        display.display();
    }
}

/****** Bluetooth SEND Temperature Function ******/
void Bluetooth_sendTemperature()
{
    float tempF = dht.readTemperature(true); // Fahrenheit
    String tempMsg = "Temp:" + String(tempF, 2) + "F";

    SerialBT.println(tempMsg);
}

/* END CODE */