Espruino JavaScript
Bangle.js 2 Battery won’t exceed 94% + ghosting #4724
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Posted at 2021-11-18 by @gfwilliams Hi, I wouldn't be too concerned about the battery percentage - it's kind of an estimate based on battery voltage, which depends on temperature as well as the calibration value of some resistors - I'd be pretty sure your battery is still fully charged. If you could run And sorry about the Beep issue. Yes, It's just software - I just checked it and while I'd made some Bangle.js 2 tweaks there it seems it had some hard-coded pin values that it attempts to use to make a beep sound (left from Bangle.js 1) - when it poked that hardware pin it caused a crash. I'll get a fix in now Posted at 2021-11-18 by Asynchronous Hey Gordon,
Thanks again. Posted at 2021-11-18 by myownself It isn't just you: Posted at 2021-11-18 by Asynchronous I see, thank you for showing me this. Posted at 2021-11-19 by @gfwilliams D3 is the actual physical pin on the IC that the battery voltage pin is connected to. The voltage varies between devices, yours isn't broken or anything - basically if you order a 100k resistor, you never actually get 100k - it's always +/- some threshold (usually 10%). To make matters worst the manufacturers sell the +/- 1%, 2%, 5% for a premium so you're basically guaranteed that a 100k resistor is either less than 95k or more than 105k. So when there's a potential divider in the watch sometimes you can get unlucky and one resistor is really high, one is really low, and it just pushes the reported voltage out. I had checked a few watches when coming up with the range but because the default battery widget doesn't display a percent I probably wouldn't have noticed after I'd done it if some were out. As for ghosting - I will get a software fix in for this soon, but realistically not until next week earliest. Posted at 2021-11-19 by Asynchronous Hey again, thanks for helping me so far, you've been brilliant. Assuming I did get ~10% less supply voltage, how can I fix it? I don't want to always see <94% on the display and I remember from an earlier thread that opening it up to change the resistors in question is not an option, as there are no screws like in my Bangle 1. What can I do? Posted at 2021-11-22 by @gfwilliams Literally all you need to do is update the firmware and it'll fix it in software. The voltage is just just for the battery measurements, so the fact it's off by a bit changes nothing apart from the battery percent indicator Posted at 2021-11-26 by rigrig Another data point for fiddling with the firmware: Posted at 2022-05-23 by @gfwilliams I've just added this to Settings so in a day or so you'll be able to go to |
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Posted at 2021-11-18 by Asynchronous
I received my Bangle.js 2 last night, assembled the straps and plugged in with the charge cable. It charged up to 94% really fast, but no matter how long I left it charging I couldn’t get it past 94%.
The cable is plugged the right way, as per the instructions card in the box.
On a non-related issue, the screen seems to have a ghosting issue when I change application. I suspect it might just be refresh frequency, but I’m unsure. One of the settings labelled “Beep” reads ‘undefined’. Whenever I select it the whole watch crashes. Is this just a software issue?
Thanks.
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