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Fancy battery level indicator (Patreon)

Published:
2022-12-08 04:30:13
Imported:
2023-02

Content

Having featured the version based on op-amps I thought it would be interesting to get a version with a microcontroller.

One of the main advantages of this unit is that it can be set for different numbers of lithium cells, from 1 to 8.  That's all done by solder links on a chain of resistors in the divider.  The microcontroller only sees the same voltage range each time.

https://www.youtube.com/watch?v=D0v6DaVa20s

Files

maxresdefault.jpg

This is the more sophisticated battery level gauge than the earlier op-amp based one. It uses a microcontroller to do the level testing, and has solder-blob links for selecting from 1 to 8 cells. The design is refreshingly simple with a selectable voltage divider for different cell counts, and all the threshold detection done with software. Mid-play video-adverts are annoying in technical videos, so I don't enable them. If you appreciate that and enjoy my content then you can help support the channel with a contribution of a dollar or two a month on Patreon. That also lets you critique the (advert free) videos before they are released, gives a more direct means of communication with me and also gives access to the regular relaxed Patreon live streams. https://www.patreon.com/bigclive #ElectronicsCreators

Comments

Mike Page

Nice and compact! They might have used filtering to add a ballistic effect or to reduce flicker. Hysteresis works better on the latter, but both together may be optimal. Flashing for overvoltage might be confused with the more common convention of flashing for flat battery. I'd prefer a colour change myself. If they've a spare pin they could drive the red outline and maybe achieve a fairly unambiguous indication.

Nani Isobel

It's strange some manufacturers go out of their way to remove every part possible. Then there is something like this where seven of the parts won't be used but they provide them anyway.