How to update a label

lesept

Hi,
I'd like to update the text of a label using values coming from sliders. I create a text variable containing the content I want to show in the label, such as

text = f'{red} {green} {blue}'

How can I display this text in my label? It seems I can only use fixed texts and not dynamic texts.

If I try

ble.write("@text TXT:text\r\n")

the label only displays 'text', instead of something like '125, 34 56'

More generally, can I use the color values from the sliders to change the BCG of another widget?

lesept

I think I found it: just make a composite string for the entire ble message

text = f'@text TXT:"{red} {green} {blue}"\r\n'
ble.write(text)

kl3m3n

@lesept Hi,

glad you've found a solution. Is this Python?

You could also concatenate strings, e.g. in C++ (assuming standard library):

#include <string>

...

auto r = std::to_string(125);
auto g = std::to_string(34);
auto b = std::to_string(56);
std::string str = "@text TXT:\"" + r + "," + g + "," + b + "\"\n\r";

// str is: @text TXT:"125,34,56"

In Python this would be even simpler...

Best regards,
kl3m3n

lesept

@kl3m3n Thanks for your answer. Yes this is (micro)python, used on an ESP32.