Bangle.js 2 how to keep backlight off while running in an app

[espruino-discuss2]

Posted at 2024-06-10 by JeonLab

I'm making an outdoor app. Apparently, the backlight is not needed under the sunlight and it will save battery as well. I also want to use the touch screen without unlocking the watch while I'm using it. So, I have settings as shown below.

Bangle.setOptions({backlightTimeout: 0}); 
Bangle.setBacklight(0);
Bangle.setLocked(false);

It works fine, but when I call either E.showMessage() or E.showPrompt(), the backlight turns on. It seems these E classes overrides the backlight setting in the code. I can immediately call Bangle.setBacklight(0); to turn it off, but wonder if there is a way to keep the backlight off while I'm running the app.

Thanks.

[espruino-discuss2]

Posted at 2024-06-10 by @gfwilliams

Why not try: Bangle.setLCDBrightness(0)? Does that work?

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Posted at 2024-06-10 by JeonLab

Thank you, @gfwilliams!
Yes, it works! I thought Bangle.setBacklight(0) would do the job, but it didn’t.
Thanks again for your quick reply. @gfwilliams, you are the best!