[PCB] Battery backpack!

twitchyliquid64 · October 28, 2020, 3:29am

Just wanted to share a battery backpack I made for the Wio Terminal, given the official one is currently unavailable.

Moar pics: x.com

If people are interested I can share the design files, let me know! I’m going to make a second version that has LEDs + voltage measurement and stuff.

ming.wen · October 28, 2020, 7:27am

Wow, that’s pretty cool!

jellyfish · October 28, 2020, 7:30am

So cute, I like it.

twitchyliquid64 · November 18, 2020, 1:52am

Ive since made another revision and sent a third off to the PCB fab!

https://twitter.com/Twitchyliquid64/status/1326013721857028097

twitchyliquid64 · November 18, 2020, 1:58am

The third (and hopefully final) revision has:

Ability to measure battery voltage
I2C EEPROM (on I2C0 - same bus as the accelerometer)
A ‘battery low’ LED
External circuitry (D-latch) to turn on and off the whole unit, drawing only 1uA when off.
The ability to turn on the unit by booping the bottom half of the Wio Terminal. The unit can turn itself off by bringing a GPIO high.

I also did a battery test today. With almost all the peripherals on, the screen and accelerometer running, but without WiFi running, I get a little over 3 hours with an 850mAh cell (4.2V → 3.2V)

nicho810 · November 18, 2020, 2:15am

wooooooow!! so cool!!

BoRRoZ · November 18, 2020, 10:31am

cool !

dbzoo · January 4, 2021, 11:41pm

You should cut a hole in the PCB and route around it to allow the two sensors, light, IR to be used.