Hello Everyone,

I am a curious mechanical engineer works in aquaculture sector, who has nothing more than wiring in automation/programming.

I bought following items:

Bluno Mega 2560 - Arduino Mega 2560 Compatible - Bluetooth 4.0
Gravity: Analog Dissolved Oxygen Sensor / Meter Kit for Arduino
Waterproof DS18B20 Digital Temperature Sensor for Arduino

and Nextion HMI from somewhere else and in the attached files i created a box to follow up the temp and DO situation in the fish transportation tanks.

I successfully be able to monitor DO and temperature data and send it to HMI with following code:

I can monitor serial monitor data with USB connection but i need to read serial monitor data by a mobile phone connection.

When I connect with a program generally i get a UUID configuratiob is not correct error.

I would like to connect to a phone and log the incoming data on it. Could someone can assist me for me to overcome this situation.

If there are any alternatives, I am open to suggestions.

Kind Regards,

Thanks In Advance.

CODE:

#include <Arduino.h>

#include <OneWire.h>

#include <DallasTemperature.h>

#include <Nextion.h>

#include "NexNumber.h" // Include the library for Nextion's NexNumber component

#define DO_PIN A1

#define VREF 5000 // VREF (mV)

#define ADC_RES 1024 // ADC Resolution

#define TWO_POINT_CALIBRATION 1

// Create objects for the DS18B20 temperature sensor

OneWire oneWire(2); // Use digital pin 2 for the DS18B20 sensor

DallasTemperature sensors(&oneWire);

// Constants for calibration

#define CAL1_V 131 // mV

#define CAL1_T 25 // °C

#define CAL2_V 1300 // mV

#define CAL2_T 15 // °C

const uint16_t DO_Table[41] = {

14460, 14220, 13820, 13440, 13090, 12740, 12420, 12110, 11810, 11530,

11260, 11010, 10770, 10530, 10300, 10080, 9860, 9660, 9460, 9270,

9080, 8900, 8730, 8570, 8410, 8250, 8110, 7960, 7820, 7690,

7560, 7430, 7300, 7180, 7070, 6950, 6840, 6730, 6630, 6530, 6410};

NexNumber n0 = NexNumber(0, 4, "n0"); // Define NexNumber object for DO on page 0, ID 1, and object name "n0"

NexNumber n1 = NexNumber(0, 5, "n1"); // Define NexNumber object for temperature on page 0, ID 2, and object name "n1"

uint8_t Temperaturet;

uint16_t ADC_Raw;

uint16_t ADC_Voltage;

uint16_t DO;

int16_t readDO(uint32_t voltage_mv, uint8_t temperature_c) {

#if TWO_POINT_CALIBRATION == 0

uint16_t V_saturation = (uint32_t)CAL1_V + (uint32_t)35 * temperature_c - (uint32_t)CAL1_T * 35;

return (voltage_mv * DO_Table[temperature_c] / V_saturation);

#else

uint16_t V_saturation = (int16_t)((int8_t)temperature_c - CAL2_T) * ((uint16_t)CAL1_V - CAL2_V) / ((uint8_t)CAL1_T - CAL2_T) + CAL2_V;

return (voltage_mv * DO_Table[temperature_c] / V_saturation);

#endif

}

void updateDO(void *ptr) {

uint32_t DO;

n0.getValue(&DO); // Get the value from the NexNumber object n0

DO /= 100; // Divide DO value by 100

// Process the received DO value (if needed)

// Update DO value in your Arduino code

}

void updateTemperature(void *ptr) {

uint32_t Temperaturet;

n1.getValue(&Temperaturet); // Get the value from the NexNumber object n1

// Process the received temperature value (if needed)

// Update temperature value in your Arduino code

}

void setup() {

Serial.begin(9600); // Serial monitor

Serial2.begin(9600); // Serial communication with the HMI display

n0.attachPop(updateDO); // Attach a callback function for updating DO value

n1.attachPop(updateTemperature); // Attach a callback function for updating temperature value

// Initialize the DS18B20 temperature sensor

sensors.begin();

}

void loop() {

// Request temperature data from the DS18B20 sensor

sensors.requestTemperatures();

// Read the temperature in Celsius from the sensor

float temperatureC = sensors.getTempCByIndex(0);

// Ensure the temperature reading is valid (not an error value)

if (temperatureC != DEVICE_DISCONNECTED_C) {

// Use the temperature reading for DO measurements

Temperaturet = (uint8_t)temperatureC;

// Read the analog value from the DO sensor on A1

ADC_Raw = analogRead(DO_PIN);

ADC_Voltage = (uint32_t)VREF * ADC_Raw / ADC_RES;

DO = readDO(ADC_Voltage, Temperaturet);

DO /= 100; // Divide DO value by 100

// Send data to the HMI display to update temperature and DO values as numeric values

Serial2.print("n1.val=");

Serial2.print(DO);

Serial2.write(0xff);

Serial2.write(0xff);

Serial2.write(0xff);

Serial2.print("n0.val=");

Serial2.print(Temperaturet);

Serial2.write(0xff);

Serial2.write(0xff);

Serial2.write(0xff);

// Print the results to the serial monitor

Serial.print("Temperaturet:\t" + String(Temperaturet) + "\t");

Serial.print("ADC RAW:\t" + String(ADC_Raw) + "\t");

Serial.print("ADC Voltage:\t" + String(ADC_Voltage) + "\t");

Serial.println("DO:\t" + String(DO) + "\t");

} else {

// Handle the case where the temperature reading is invalid

Serial.println("Error: Temperature reading from DS18B20 is invalid.");

// You can decide how to handle the error, e.g., use a default value.

Temperaturet = 25; // Default temperature in °C

}

delay(2000); // Update the display every second

}