PH meter V2.0 terminal

Need Help With My Project
1

Hello,

How are you :slight_smile: Please help me with my sketch,… My build: ESP32, BLYNK IOT, Gravity PH meter V2.0

Everything works on the serial monitor, but do I need to calibrate in the Blynk IOT - Terminal widget? or something like that.I see only the actual PHValue. My vision is that if I type this (as in the serial monitor) ENTERPH, CALPH, EXITPH, it will work as it should.

i used this library
DFRobot_ESP_PH_BY_GREENPONIK

my sketch:

/*


 *   enterph -> enter the calibration mode
 *   calph   -> calibrate with the standard buffer solution, two buffer solutions(4.0 and 7.0) will be automaticlly recognized
 *   exitph  -> save the calibrated parameters and exit from calibration mode
 * 
 */
 
// Replace/ Fill-in information from your Blynk Template here
#define BLYNK_TEMPLATE_ID ""
#define BLYNK_DEVICE_NAME ""
#define BLYNK_AUTH_TOKEN ""


#define BLYNK_FIRMWARE_VERSION "0.1.0"
#define BLYNK_PRINT Serial
#include "BlynkEdgent.h"


#include "DFRobot_ESP_PH.h"
#include "EEPROM.h"
#include <SimpleTimer.h>



DFRobot_ESP_PH ph;
#define ESPADC 4096.0   //the esp Analog Digital Convertion value
#define ESPVOLTAGE 3300 //the esp voltage supply value
#define PH_PIN 35    //the esp gpio data pin number
float voltage, phValue, temperature = 25;

static unsigned long timepoint = millis();


void phsonda()

{

  if (millis() - timepoint > 1000U) //time interval: 1s
  
    timepoint = millis();
    //voltage = rawPinValue / esp32ADC * esp32Vin
    voltage = analogRead(PH_PIN) / ESPADC * ESPVOLTAGE; // read the voltage
    Serial.print("voltage:");
    Serial.println(voltage, 4);
    
    //temperature = readTemperature();  // read your temperature sensor to execute temperature compensation
    Serial.print("temperature:");
    Serial.print(temperature, 1);
    Serial.println("^C");

    phValue = ph.readPH(voltage, temperature); // convert voltage to pH with temperature compensation
    Serial.print("pH:");
    Serial.println(phValue, 4);
   Blynk.virtualWrite(V78,phValue);
 
  
  
  
  ph.calibration(voltage, temperature); // calibration process by Serail CMD
delay(4000);
}

float readTemperature()
{
  //add your code here to get the temperature from your temperature sensor
}
 
void setup()
{
  
    Serial.begin(115200);    
    BlynkEdgent.begin();//(115200);
  EEPROM.begin(32);//needed to permit storage of calibration value in eeprom
  ph.begin();
  delay(2000);

timer.setInterval(1000L, phsonda);  

}

void loop() 
{
    timer.run(); 

  BlynkEdgent.run();
}

I´m using PRO plan :heart_eyes:

2

@nesvi Please edit your post, using the pencil icon at the bottom, and add triple backticks at the beginning and end of your code so that it displays correctly.
Triple backticks look like this:
```

Copy and paste these if you can’t find the correct symbol on your keyboard.

Pete.

1 Like
3

This statement implies that you already have code in your sketch that looks for input of these key words, presumably followed by values, and takes the appropriate action.
I don’t see this code in the sketch you’ve posted.

To be honest, using the serial monitor or the terminal widget in this way is a very clunky approach.
You’d be far better having a tab within your mobile dashboard that allows calibration values to be entered via appropriate widgets (numeric input I would expect).

Pete.

4 
/*
 * file DFRobot_ESP_PH.cpp * @ https://github.com/GreenPonik/DFRobot_ESP_PH_BY_GREENPONIK
 *
 * Arduino library for Gravity: Analog pH Sensor / Meter Kit V2, SKU: SEN0161-V2
 * 
 * Based on the @ https://github.com/DFRobot/DFRobot_PH
 * Copyright   [DFRobot](http://www.dfrobot.com), 2018
 * Copyright   GNU Lesser General Public License
 *
 * ##################################################
 * ##################################################
 * ########## Fork on github by GreenPonik ##########
 * ############# ONLY ESP COMPATIBLE ################
 * ##################################################
 * ##################################################
 * 
 * version  V1.0
 * date  2019-05
 */

#include "Arduino.h"
#include "DFRobot_ESP_PH.h"
#include "EEPROM.h"

#define PH_3_VOLTAGE 2010

DFRobot_ESP_PH::DFRobot_ESP_PH()
{
    this->_temperature = 25.0;
    this->_phValue = 7.0;
    this->_acidVoltage = 2032.44;   //buffer solution 4.0 at 25C
    this->_neutralVoltage = 1500.0; //buffer solution 7.0 at 25C
    this->_voltage = 1500.0;
}

DFRobot_ESP_PH::~DFRobot_ESP_PH()
{
}

void DFRobot_ESP_PH::begin()
{
    //check if calibration values (neutral and acid) are stored in eeprom
    this->_neutralVoltage = EEPROM.readFloat(PHVALUEADDR); //load the neutral (pH = 7.0)voltage of the pH board from the EEPROM
    if (this->_neutralVoltage == float() || isnan(this->_neutralVoltage))
    {
        this->_neutralVoltage = 1500.0; // new EEPROM, write typical voltage
        EEPROM.writeFloat(PHVALUEADDR, this->_neutralVoltage);
        EEPROM.commit();
    }

    this->_acidVoltage = EEPROM.readFloat(PHVALUEADDR + sizeof(float)); //load the acid (pH = 4.0) voltage of the pH board from the EEPROM
    if (this->_acidVoltage == float() || isnan(this->_acidVoltage))
    {
        this->_acidVoltage = 2032.44; // new EEPROM, write typical voltage
        EEPROM.writeFloat(PHVALUEADDR + sizeof(float), this->_acidVoltage);
        EEPROM.commit();
    }
}

float DFRobot_ESP_PH::readPH(float voltage, float temperature)
{
    // Serial.print("_neutraVoltage:");
    // Serial.print(this->_neutralVoltage);
    // Serial.print(", _acidVoltage:");
    // Serial.print(this->_acidVoltage);
    float slope = (7.0 - 4.0) / ((this->_neutralVoltage - 1500.0) / 3.0 - (this->_acidVoltage - 1500.0) / 3.0); // two point: (_neutralVoltage,7.0),(_acidVoltage,4.0)
    float intercept = 7.0 - slope * (this->_neutralVoltage - 1500.0) / 3.0;
    // Serial.print(", slope:");
    // Serial.print(slope);
    // Serial.print(", intercept:");
    // Serial.println(intercept);
    this->_phValue = slope * (voltage - 1500.0) / 3.0 + intercept; //y = k*x + b
    Serial.print("[readPH]... phValue ");
    Serial.println(this->_phValue);
    return this->_phValue;
}

void DFRobot_ESP_PH::calibration(float voltage, float temperature, char *cmd)
{
    this->_voltage = voltage;
    this->_temperature = temperature;
    strupr(cmd);
    phCalibration(cmdParse(cmd)); // if received Serial CMD from the serial monitor, enter into the calibration mode
}

void DFRobot_ESP_PH::calibration(float voltage, float temperature)
{
    this->_voltage = voltage;
    this->_temperature = temperature;
    if (cmdSerialDataAvailable() > 0)
    {
        phCalibration(cmdParse()); // if received Serial CMD from the serial monitor, enter into the calibration mode
    }
}

boolean DFRobot_ESP_PH::cmdSerialDataAvailable()
{
    char cmdReceivedChar;
    static unsigned long cmdReceivedTimeOut = millis();
    while (Serial.available() > 0)
    {
        if (millis() - cmdReceivedTimeOut > 500U)
        {
            this->_cmdReceivedBufferIndex = 0;
            memset(this->_cmdReceivedBuffer, 0, (ReceivedBufferLength));
        }
        cmdReceivedTimeOut = millis();
        cmdReceivedChar = Serial.read();
        if (cmdReceivedChar == '\n' || this->_cmdReceivedBufferIndex == ReceivedBufferLength - 1)
        {
            this->_cmdReceivedBufferIndex = 0;
            strupr(this->_cmdReceivedBuffer);
            return true;
        }
        else
        {
            this->_cmdReceivedBuffer[this->_cmdReceivedBufferIndex] = cmdReceivedChar;
            this->_cmdReceivedBufferIndex++;
        }
    }
    return false;
}

byte DFRobot_ESP_PH::cmdParse(const char *cmd)
{
    byte modeIndex = 0;
    if (strstr(cmd, "ENTERPH") != NULL)
    {
        modeIndex = 1;
    }
    else if (strstr(cmd, "EXITPH") != NULL)
    {
        modeIndex = 3;
    }
    else if (strstr(cmd, "CALPH") != NULL)
    {
        modeIndex = 2;
    }
    return modeIndex;
}

byte DFRobot_ESP_PH::cmdParse()
{
    byte modeIndex = 0;
    if (strstr(this->_cmdReceivedBuffer, "ENTERPH") != NULL)
    {
        modeIndex = 1;
    }
    else if (strstr(this->_cmdReceivedBuffer, "EXITPH") != NULL)
    {
        modeIndex = 3;
    }
    else if (strstr(this->_cmdReceivedBuffer, "CALPH") != NULL)
    {
        modeIndex = 2;
    }
    return modeIndex;
}

void DFRobot_ESP_PH::phCalibration(byte mode)
{
    char *receivedBufferPtr;
    static boolean phCalibrationFinish = 0;
    static boolean enterCalibrationFlag = 0;
    switch (mode)
    {
    case 0:
        if (enterCalibrationFlag)
        {
            Serial.println(F(">>>Command Error<<<"));
        }
        break;

    case 1:
        enterCalibrationFlag = 1;
        phCalibrationFinish = 0;
        Serial.println();
        Serial.println(F(">>>Enter PH Calibration Mode<<<"));
        Serial.println(F(">>>Please put the probe into the 4.0 or 7.0 standard buffer solution<<<"));
        Serial.println();
        break;

    case 2:
        if (enterCalibrationFlag)
        {
            if ((this->_voltage > PH_8_VOLTAGE) && (this->_voltage < PH_6_VOLTAGE))
            { // buffer solution:7.0
                Serial.println();
                Serial.print(F(">>>Buffer Solution:7.0"));
                this->_neutralVoltage = this->_voltage;
                Serial.println(F(",Send EXITPH to Save and Exit<<<"));
                Serial.println();
                phCalibrationFinish = 1;
            }
            else if ((this->_voltage > PH_5_VOLTAGE) && (this->_voltage < PH_3_VOLTAGE))
            { //buffer solution:4.0
                Serial.println();
                Serial.print(F(">>>Buffer Solution:4.0"));
                this->_acidVoltage = this->_voltage;
                Serial.println(F(",Send EXITPH to Save and Exit<<<"));
                Serial.println();
                phCalibrationFinish = 1;
            }
            else
            {
                Serial.println();
                Serial.print(F(">>>Buffer Solution Error Try Again<<<"));
                Serial.println(); // not buffer solution or faulty operation
                phCalibrationFinish = 0;
            }
        }
        break;

    case 3: //store calibration value in eeprom
        if (enterCalibrationFlag)
        {
            Serial.println();
            if (phCalibrationFinish)
            {
                if ((this->_voltage > PH_8_VOLTAGE) && (this->_voltage < PH_5_VOLTAGE))
                {
                    EEPROM.writeFloat(PHVALUEADDR, this->_neutralVoltage);
                    EEPROM.commit();
                }
                else if ((this->_voltage > PH_5_VOLTAGE) && (this->_voltage < PH_3_VOLTAGE))
                {
                    EEPROM.writeFloat(PHVALUEADDR + sizeof(float), this->_acidVoltage);
                    EEPROM.commit();
                }
                Serial.print(F(">>>Calibration Successful"));
            }
            else
            {
                Serial.print(F(">>>Calibration Failed"));
            }
            Serial.println(F(",Exit PH Calibration Mode<<<"));
            Serial.println();
            phCalibrationFinish = 0;
            enterCalibrationFlag = 0;
        }
        break;
    }
}

It´s here :slight_smile: ok so I try to use numeric input

5

I used the Atlas Scientific ph probe. To calibrate it uses cmd commands. I eventually managed to get it working where I push a buttons on my interface to issue the calibration states which in turn call a cmd command without the need for serial. I attach my code it might be useful to you.

void pHFunction()
{
 if (input_string_complete == true)
  {               
    Serial3.print(inputstring);                      
    Serial3.print('\r');                             
    inputstring = "";                                 
    input_string_complete = false;                    
  }
  if (sensor_string_complete == true)
  {
    if (isdigit(sensorstring[0]))
    {
      pH = sensorstring.toFloat();
      //Serial.println(pH); 
    }
  }
  sensorstring = "";                                  
  sensor_string_complete = false;
  if (CAL7 == true)     
  {
    Serial3.print("cal,mid,7\r\n");
  }
  if (CAL4 == true)    
  {
    Serial3.print("cal,low,4\r\n");
  }
  if (CAL10 == true)    
  {
    Serial3.print("cal,high,10\r\n");
  }
}
6

could you apply it to my code??? please

7

I don’t write code for other people. I have given you the pH function which you should be able to adapt. Remember though I used the Atlas Scientic probe and shield. Maybe you should look at their website where they have examples of code, and then you will be able to see how I have come by my code

1 Like