Turn off the display after a while

[espruino-discuss2]

Posted at 2023-06-28 by fparri

Hello everyone. I apologize if this is a common question, but I can’t seem to find a solution. Is there a way to completely turn off the display on the Bangle.js 2 after some time, until I use the watch again? I don’t mean just dimming it, but turning it off :)

While i can do it on the Bangle.js, I cannot on the Bangle.js 2

Thank you for your patience.

[espruino-discuss2]

Posted at 2023-06-28 by @thyttan

Hi!

What's the reason for you wanting this? The screen of B2 is designed to be always on - it's called a 'transflective display' sometimes.

You could make a clock face or bootloader app that paints the screen black whenever it times out. I don't know if there already is one.

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Posted at 2023-06-28 by m-p{3}

If the screen isn't changing, the power consumption is basically null, as if it was off. You won't save battery by blanking it out.

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Posted at 2023-06-29 by d3nd3-o0

It might be because its a "Memory In Pixel" type display. I assume this means that it retains the last pixels like an always on type of thing. A simple Bangle.on('lcdPower', function(on) { if (!on)g.clear() }); should do the job. Can save it as a lcdoff.boot.js file, then delete it if you don't like.

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Posted at 2023-06-29 by @halemmerich

If the motivation is saving power this won't do much. AFAIK the display is still refreshed at about once a second. If no code is loaded the Bangle 2 runs for a really long time. I tried to record a discharge curve and lost about 20% of battery in 4 weeks before giving up. Maybe a 0 brightness setting would be more useful for very low power use.

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Posted at 2023-06-29 by fparri

Thanks a lot for all your replies guys :)

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Posted at 2023-06-29 by @gfwilliams

Hi - you can set a timer for turning the LCD off with:

Bangle.setOptions({lcdPowerTimeout:10000}); // ms - so 10000 = 10 sec

And you can paste that into the Custom Boot Code app to get it to apply for you.

But as others have said, turning the LCD off makes basically zero difference to power consumption (about 1%), so really you'd only be doing it for privacy