Battery Charging For Gemma

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siz3thr33
 
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Joined: Mon Nov 29, 2021 12:16 am

Battery Charging For Gemma

Post by siz3thr33 »

Hey Adafruit! I am working on a pretty basic LED dog collar project using the Gemma M0 board. My goal is to power the collar from a LiPo battery and be able to charge it using using a usb cable.

Eventually I will 3D print an enclosure for all of the parts involved. I'm not positive on this, but I'm imagining that the entire Gemma board will be "hidden" by the enclosure, meaning the USB port on the Gemma's board itself won't be exposed. I was thinking that was what the USB LiIon/LiPoly charger - v1.2 was for; I would build the enclosure with some opening for the USB port from that board (I suppose I could just expose the Gemma USB port, but I'm just curious how this would be done anyways). It looks like the battery's JST connector would go into the charger's "BATT" port, and I would use another JST cable from the "LOAD" port to the gemma itself:

Code: Select all

+-------------+     +----------------------+     +------------------+
+  Battery    +     |     Charger          |     +  Gemma           +
+             +     |                      |     +                  +
+             +     |                      |     +                  +
+             +     | +------+  +------+   |     +                  +
+             +     | | BATT |  | LOAD |   |     +                  +
+-------------+     +----------------------+     +------------------+
      |                  |          |                     |
      |                  |          |                     |
      +------------------+          +----------------------
My question is whether or not that would work, or if I should be using a LiPo Backpack like the one mentioned in this forum post.

Thanks!

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adafruit_support_bill
 
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Re: Battery Charging For Gemma

Post by adafruit_support_bill »

It should work fine with either that charger or the backpack. The backpack is smaller and probably a better match for the size of the Gemma. But the charge rate is slower.

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siz3thr33
 
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Re: Battery Charging For Gemma

Post by siz3thr33 »

Awesome, Thank you!

I’ll probably prototype with the charger and move to the backpack when im more confident in my soldering ability :)

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