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Battery Charging For Gemma
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

Battery Charging For Gemma

by siz3thr33 on Mon Nov 29, 2021 9:09 am

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 | TOGGLE FULL SIZE
+-------------+     +----------------------+     +------------------+
+  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!

siz3thr33
 
Posts: 6
Joined: Mon Nov 29, 2021 12:16 am

Re: Battery Charging For Gemma

by adafruit_support_bill on Mon Nov 29, 2021 9:21 am

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.

adafruit_support_bill
 
Posts: 82801
Joined: Sat Feb 07, 2009 10:11 am

Re: Battery Charging For Gemma

by siz3thr33 on Mon Nov 29, 2021 11:28 am

Awesome, Thank you!

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

siz3thr33
 
Posts: 6
Joined: Mon Nov 29, 2021 12:16 am

Please be positive and constructive with your questions and comments.


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