Cannot convert 'NexNumber' to 'double' in assignment

Firmware
1

Hello @ScruffR

Good day, I’m working with a “Particle electron” and a HMI “Nextion”, I’m trying to enter a numeric value “Setpoint”, but when I compile the following message is shown:
cannot convert ‘NexNumber’ to ‘double’ in assignment

In this section I register my variable that is n6:

void b0PopCallback(void *ptr);
void n6PopCallback(void *ptr);
void b1PopCallback(void *ptr);
void b2PopCallback(void *ptr);
void n7PopCallback(void *ptr);
void b3PopCallback(void *ptr);
void b4PopCallback(void *ptr);

NexNumber n0 = NexNumber(0, 10, "n0");
NexNumber n1 = NexNumber(0, 11, "n1");
NexNumber n2 = NexNumber(0, 12, "n2");
NexNumber n4 = NexNumber(0, 13, "n4");
NexNumber n5 = NexNumber(0, 14, "n5");
NexButton b0 = NexButton(0, 15, "b0");

NexNumber n6 = NexNumber(5, 12, "n6");
NexButton b1 = NexButton(5, 8, "b1");
NexButton b2 = NexButton(5, 9, "b2");

NexNumber n7 = NexNumber(5, 13, "n7");
NexButton b3 = NexButton(5, 10, "b3");
NexButton b4 = NexButton(5, 11, "b4");

char buffer[100] = {0};

NexTouch *nex_listen_list[] = 
{
    &n0,
    &n1,
    &n2,
    &n4,
    &n5,
    &b0,
    &n6,
    &b1,
    &b2,
    &n7,
    &b3,
    &b4,
    NULL
};
// BINARY INPUTS
void n6PopCallback(void *ptr)
{
    dbSerialPrintln("n6PopCallback");
    n6.setValue(3);
}

void b1PopCallback(void *ptr)
{
    uint32_t number;
    
    dbSerialPrintln("b1PopCallback");

    n6.getValue(&number);
    
    number += 1;
    
    n6.setValue(number);
}

void b2PopCallback(void *ptr)
{
    uint32_t number;
    
    dbSerialPrintln("b2PopCallback");

    n6.getValue(&number);
    
    number -= 1;
    
    n6.setValue(number);
}

            /* Setpoint glycol differential */

void n7PopCallback(void *ptr)
{
    dbSerialPrintln("n7PopCallback");
    n7.setValue(3);
}

void b3PopCallback(void *ptr)
{
    uint32_t number;
    
    dbSerialPrintln("b3PopCallback");

    n7.getValue(&number);
    
    number += 1;
    
    n7.setValue(number);
}

void b4PopCallback(void *ptr)
{
    uint32_t number;
    
    dbSerialPrintln("b4PopCallback");

    n7.getValue(&number);
    
    number -= 1;
    
    n7.setValue(number);
}

plus everything else that my project takes.

and in this section is where I want to take the value that I enter from my HMI:

void updateSystemVariables(){

    VAL_PRODUCT_TEMP = analogRead(IN_PRODUCT_TEMP);
    // ***** invalid mapping range - just for testing
    VAL_PRODUCT_TEMP = map(VAL_PRODUCT_TEMP, 0.0, 4095.0, -10.0, 50.0);

    delay(5);
    VAL_PRODUCT_SP = n6;
    /* VAL_PRODUCT_SP = analogRead(IN_PRODUCT_TEMP_SP); */
    // ***** invalid mapping range - just for testing
    /* VAL_PRODUCT_SP = map(VAL_PRODUCT_SP, 0.0, 4095.0, -10.0, 50.0); */

    delay(5);
    VAL_GLYCOL_TEMP = analogRead(IN_GLYCOL_TEMP);
    // ***** invalid mapping range - just for testing
    VAL_GLYCOL_TEMP = map(VAL_GLYCOL_TEMP, 0.0, 4095.0, -10.0, 50.0);

    delay(5);
    VAL_GLYCOL_DIFF = n7;
    /* VAL_GLYCOL_DIFF = analogRead(IN_GLYCOL_DIFF); */
    /* VAL_GLYCOL_DIFF = map(VAL_GLYCOL_DIFF, 0.0, 4095.0, -10.0, 10.0); */

    VAL_GLYCOL_SP = VAL_PRODUCT_SP + VAL_GLYCOL_DIFF;
    if(VAL_GLYCOL_SP > 50){
        VAL_GLYCOL_SP = 50;
    }
    if(VAL_GLYCOL_SP < -10){
        VAL_GLYCOL_SP = -10;
    }
}

I can not find how I can put the value or convert that value to be able to take it in my code.

thanks

2

Would be good to know which line featureing n6 throws that error.

BTW, instead of assigning the objects like this

NexNumber n0 = NexNumber(0, 10, "n0");

you should rather directly instantiate them like this

NexNumber n0(0, 10, "n0");

If you are using Web IDE please share link to a SHARE THIS REVISION copy of your project.
Having the HMI file for your display would also help.

1 Like
3

@ScruffR

okay, I will be try NexNumber n6(5, 12, “n6”);

nexNumber01
nexNumber011366×768 166 KB

I attached an image to show the error
Thanks

4

Since you are doing this

NexNumber n6 = NexNumber(5, 12, "n6");

n6 is an object not a numeric value and AFAIK there is no assignment operator overload (operator=) nor a cast operator overload which would allow an assignment towards a numeric data type.

However, you should be able to do this

  uint32_t n;
  n6.getValue(&n);
  VAL_PRODUCT_SP = n;