Supercapacitor powered LED jewelry

Earrings, necklace, pendant ...

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Fast USB reachargeable earrings or necklace


- Supercapacitor powered
- Random flashing 9 modes (random, pong, spiral, scan, rain )
- 2 predefined texts "Happy birthday", "I love you"
- Pink, Purple, Blue, Red or Green led color.
- PANASONIC supercapacitor 0,33F
- no battery,
- no memory effects
- no life limit
- unlimited charging / discharging cycles.
- auto power off :)
- modern technology
- cool gadget
- unique in world
- controlled with ATTINY85 MCU with Arduino software
- charging time 2...10 minutes
- operation time 2 hours ... for single led or 8 hours for matrix version depends on LED flashing frequency
- 10 minutes for text mode


sch - 689.72 kB - 11/15/2016 at 21:31


h - 2.91 kB - 11/15/2016 at 21:31


brd - 104.26 kB - 11/15/2016 at 21:31


ino - 9.86 kB - 11/15/2016 at 21:31


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Alex Martin wrote 11/16/2016 at 22:39 point

Interesting concept, what is the advantage of using a supercapacitor instead of a battery?

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bobricius wrote 11/16/2016 at 22:42 point

unlimited life, fast charging, cheap, reliable, small ...

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Alex Martin wrote 11/17/2016 at 23:06 point

I thought the main disadvantage of supercaps is that they are expensive. 

I read they have issues with leakage current. Does this concern you?

Also, the discharge of a supercap is linear, so the voltage would likely drop below the level required to power the Atmel chip before it has discharged. Compared to lithium cells, which have a flat discharge rate, this seems disadvantageous.

  Are you sure? yes | no

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