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assembled, put to sleep, in daily use.

A project log for cyborg ring

cordwood + smt + jewelry + blinkies + zinc-air batteries

zakqwyzakqwy 05/05/2018 at 15:598 Comments

I assembled the new ring version some time ago but didn't get a chance to putz with the programming until now. Gross, programming. But yay, yellow LEDs:

Used a pin change interrupt on the button to wake up the t85; previously, resting current draw ("resting") was nearly a milliamp which nuked the batteries in a few days. Now down in the microamp range, which should make Zn-air life the limiting factor (4-6 weeks depending on use):

Note that I kept the pogo rig together but soldered wires on for iterative programming. It's fussy to repeatedly align.

Reinforcement wires worked like a charm. I took a few traces dangerously close to the PCB edge which bit me this time, but nothing a few jumpers couldn't fix:

The ring also has a bit of conformal coating, and I used the largest spring tabs from the previous order (A108284CTs). Assuming the ring doesn't break in the next week, I'll wear it to Teardown. 

Discussions

deʃhipu wrote 05/05/2018 at 16:35 point

It really looks great. I wonder if you could somehow also fit the button inside there, straddling the pcbs.

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zakqwy wrote 05/05/2018 at 17:36 point

thanks! I'll keep my eyes peeled for a 4mm button. would be easier to press, for sure.

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Jan wrote 05/05/2018 at 16:34 point

I'm curious: did you use all the bells and whistles, regarding power down? I mean all the power reduction registers, pulling up unused pins, turning BOD and ADC off etc.?

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zakqwy wrote 05/05/2018 at 17:36 point

nope, just shutdown mode. I think further savings could be possible. but potentially not needed, as I think battery life is the constraint.

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davedarko wrote 05/05/2018 at 16:31 point

bam! super cool :)

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zakqwy wrote 05/05/2018 at 17:36 point

:-D

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Peter McCloud wrote 05/05/2018 at 16:27 point

This project continues to amaze me. Well done!

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zakqwy wrote 05/05/2018 at 16:27 point

thanks friend!!

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