How can you send a variable from ESP32 to Squareline Studio’s GUI?

How-to
1

I’m working on the ESP32 to automatically update text labels from various inputs.

2

You dont mention what version of LVGL you are using so I’ll assume 9.1, I’ll also assume you are using Arduino…

The docs are here:
https://docs.lvgl.io/9.1/

You specifically want to look at:
https://docs.lvgl.io/9.1/widgets/label.html

In the past I’ve created global variables for the labels I want to update (not in the creation of the label itself) IE in the project.ino file define the label ie:

lv_obj_t * labelx;

Then create it as normal.

In your loop code (or even better a lv task) update the label per:

lv_label_set_text(labelx, "My updated text");

Or if you want sprintf type formatting you can use:

lv_label_set_text_fmt(labelx, "%s #%s %s°c#", bWeather.c_str(), strColour, doc["temp"].as<String>());

Hope that helps!

3

I think a similar issue had already been answered here: How do you send ESP32/Arduino variable to Squareline's GUI? - How to - Forum - SquareLine Studio