How can i print this value to my Nextion?

Using Arduino Displays
1 
#include "EasyNextionLibrary.h"
#include <Wire.h> 
#include <Robojax_WCS.h>
#define MODEL 12 //see list above
#define SENSOR_PIN A0 //pin for reading sensor
#define SENSOR_VCC_PIN 8 //pin for powring up the sensor
#define ZERO_CURRENT_LED_PIN 2 //zero current LED pin

#define ZERO_CURRENT_WAIT_TIME 5000 //wait for 5 seconds to allow zero current measurement
#define CORRECTION_VLALUE 164 //mA
#define MEASUREMENT_ITERATION 100
#define VOLTAGE_REFERENCE  5000.0 //5000mv is for 5V
#define BIT_RESOLUTION 10
#define DEBUT_ONCE true


Robojax_WCS sensor(
          MODEL, SENSOR_PIN, SENSOR_VCC_PIN, 
          ZERO_CURRENT_WAIT_TIME, ZERO_CURRENT_LED_PIN,
          CORRECTION_VLALUE, MEASUREMENT_ITERATION, VOLTAGE_REFERENCE,
          BIT_RESOLUTION, DEBUT_ONCE           
          );
EasyNex myNex(Serial); 

int RelayStart = 9;
int Relay1 = 10;
int Relay2 = 11;
int Relay3 = 12;
int Relay4 = 7;
int T = 15000;
int T2 = 1500;
int T3 = 500;
int pin_value = 0;
int progress_value;


void setup()
{

myNex.begin(9600); 
  
pinMode(RelayStart,OUTPUT);
pinMode(Relay1,OUTPUT);
pinMode(Relay2,OUTPUT);
pinMode(Relay3,OUTPUT);
pinMode(Relay4,OUTPUT);
digitalWrite(RelayStart,LOW);
digitalWrite(Relay1,LOW);
digitalWrite(Relay2,LOW);
digitalWrite(Relay3,LOW);
digitalWrite(Relay4,LOW);
sensor.start();
}

void loop() {
   myNex.NextionListen();
   sensor.readCurrent();
   sensor.printCurrent();
   
}

void trigger0(){
  digitalWrite(Relay1, !digitalRead(Relay1)); 

}

void trigger1(){

}

void trigger2(){
digitalWrite(RelayStart,!digitalRead(RelayStart));
}

Hi all,

Iam new to arduino and i have a question. When "sensor.printCurrent" is activated this happens in the library:

void Robojax_WCS::printCurrent()
{
   Serial.print("Current:");
   Serial.print(getCurrent(),2);
   Serial.println("A");
   Serial.println();

}//printCurrent()

I want the part " Serial.print(getCurrent(),2);" to print on my Nextion. To print variables on the Nextion i use an library which uses the code "myNex.writeNum("x0.val", Anything);" to print values to the Nextion. If i can convert the getCurrent to an int or something else i think i can print it. Does someone have an idea what to do? Thanks in Advance.

The getCurrent code:

float Robojax_WCS::getCurrent()
{
 //robojax.com WCS Current Measurement for Arduino

    float averageSensorValue =0;
    int sensorValue ;
    float voltage, current;

    for(int i=0; i< _iteration; i++)
    {   
      sensorValue = analogRead(_vin);
      //Serial.print("S:");Serial.println(sensorValue);      
      delay(2);

        voltage = (sensorValue) * (_voltageReference /  (pow(2,_bitResolution)-1)) -( _quiescent_Output_voltage[_model] * _voltageReference) + _correctionValue ; 
       //Serial.print("V:");Serial.println(voltage);
        current  = voltage / _sensitivity[_model]  ;
 
          averageSensorValue += current;
 

    }    

    averageSensorValue /=_iteration;
    if(_zeroCurrentSet)
    {
     averageSensorValue -=_zeroCurrentValue;//subtract the zero current value
    }
    
    return   averageSensorValue;
}//getCurrent()
2

Try... int getCurrent(),

1 Like
3

Thanks for your response, int getCurrent(); does not cause any errors but when i try to send it to Nextion it doesn`t work.

int getCurrent();
myNex.writeNum("x0.val", getCurrent);
4

Don't redefine the function. Only tell the compiler to add code to convert from float to int in the print/write situation.

"Doesn't work " tells nothing.

5

Ok so i added the int getCurrent(); how should i continue?

int tempInt = temperature*10;      // Convert the float to int. Multiply it x10                       
myNex.writeNum("x1.val", tempInt); // Write it to x1 Xfloat component on Nextion

This is an example of a piece of code that does work.
I want to send the getCurrent to change "x0.val"

6

@PerryBebbington sounds like one for you.

7

Hi Bob,
Thanks but @shieftech is using @Seithan's Easy Nextion Library, about which I know nothing. Maybe @Seithan can help.

Moved to the display section as this is about a display.

8

It looks like You have changed the original code You posted. Don't do that! Post new or changed code in Your following posts. Now I don't find the print/write line of code.

Post the original code down here.

9

I haven`t changed the code. The piece of code i provided in my last answer is just an example code from the owner of the library. The original code is still the same as the one I posted the first time.

11

Here i have the piece of code which should send the data to my Nextion:

{
  int current = getCurrent; 
   myNex.writeNum("x0.val", current);
   Serial.print(getCurrent(),2);
Serial.println();
  
 
}```

`But when I try to upload this I get the error message: cannot convert 'Robojax_WCS::getCurrent' from type 'float (Robojax_WCS::)()' to type 'int'.
12

Okey. I had a slow day...
In my first reply what I suggested should look like this:

Your later attempt, redfineing the float function getCurrent to be an int.... Drop that!

13

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