GetValue strange behavior

[llist]

Hi,

I have a Numeric Variable I can SET the variable but when i read the Value the result is 0 ??
Same for a Slider , I can change color and value but when I use slider.getValue() the result is 0 !!

Every setValue => OK Every getValue => not OK return value are 0
An Idea ?

Arduino Mega 2560 and screen Nextion NX4832K035_011 or NX4832T035_011

[llist]

this is the solution

For UNO
#define UNO_RXPIN 10
#define UNO_TXPIN 11
SoftwareSerial nextionSerial(UNO_RXPIN, UNO_TXPIN); // RX, TX

For MEGA
#define MEGA_RX_PIN 53
#define MEGA_TX_PIN 51

SoftwareSerial nextionSerial(MEGA_RX_PIN, MEGA_TX_PIN); // RX, TX

[Snake675]

Hi
This solution does not work for me. Still getting zeros all the time on any "getValue()".

[vandijkict]

I have the same problem, my result for getValue() is always 0
The same problem with dual state buttons or radiobuttons

[llist]

Hi,
If you can change the value that means your TX_PIN is the good one .
GetValue = Rx_PIN = read pin if you cannot read there are 2 assumptions :
Case 1 : For RX_PIN choose the good PIN number in your Arduino board ( See First post )
Case 2: under your screen through Nextion Editor change/verify if your variable attribut was set to : VSCOPE = global.
Reason : ex: Screen 1 contains the Variable1 : you can read it only if screen1 is in front ( displayed)
If you are set this variable in global mode you can read even if the screen is not displayed.

Hoping that can help you

[vandijkict]

There is nothing wrong with communication, because I can read the callback events and read and change textboxes

[llist]

Hi
Another possibility.

Into your source code add the screen name into the variable declaration: see ECRANS.onoff_pompBois

//----------------------------------------
#define ECRAN_1 1
.....
Nextion nex(nextionSerial);
NextionPage ecran1(nex, ECRAN_1, 0, "ECRANS");

NextionVariableNumeric MyVar(nex, ECRAN_1, 6, "ECRANS.onoff_pompBois");

try this

Good luck