[sdiy] advice on creating power for small wearables? batteries ? solar ? Etc

[sleepy_dog at gmx.de]

when you, on ebay or aliexpress, enter "LiPo 3.7V rechargeable",
does anything that comes up look to your liking?
they can get rather small when they are like 50 mAh or maybe 120.
Depending how *small* is your idea of "quite small".
And then you'd probably one a microcontroller pecifically geared towards
low power consumption. E.g. the STM32 L ... series (but those are the
only ones I know & have used, so can't say whether those ar particularly
good in that aim compared to others. They have L series with cortex M0
core up to M4 with floating point, which would probably be less "low
power" than smaller chips - all depending on what's needed),
And then implement all possible measures in the firmware to not eat more
power than needed - which is a thing that changes depending on
circumstances.
So you might find yourself turning off and on peripherals, reducing the
processor speed, etc, and even go to a sleep mode. To be woken up again
by some event.


Am 07.10.2020 um 18:43 schrieb Dan Snazelle:
> Hello
>
> I am working on a project that is quite small. I would love some advice on which coin or flat  batteries are good , small and have a decent output ..I would love to be able to drive leds, a 3.3v uprocessor, maybe a small speaker but of course AA batteries or a 9v are too big for this
>
> another possibility is a storage battery with a solar cell that continually charges the battery—I have never tried this and once again any advice would be great.
>
> obviously it’s possible as the Apple Watch has quite a small footprint yet is able to drive a screen and a microprocessor. i suppose a tiny dc to dc converter could help
> Too
>
> I see other examples all over the place I’ve just never been in a position where I needed something very small and instead of going through thousands of entries online I figured I would ask the community first
>
>
> THANKS FOR ANY HELP
>
>
>
>
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