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Supercapacitor powered LED jewelry

Earrings, necklace, pendant ...

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$25.00
bobricius has 580 orders / 41 reviews
Ships from Sarisske Dravce, SK
Fast USB reachargeable earrings or necklace

Features:

- 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


Video https://youtu.be/gl-nom74Fks

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

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Discussions

Simon Merrett wrote 12/03/2018 at 10:29 point

@bobricius could you please tell me more about the charging system? Do you have brown out disabled to maximise the runtime? If possible posting a png of the schematic would be great as I am stuck on a mobile phone with no EDA for a while. Is it just a resistor? How did you determine the charge rate? Thanks 

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bobricius wrote 12/03/2018 at 11:59 point

Hi, I randomly pick for charging only 4R7 ... nothing special, just usb and supercap. yes, brown out is disabled it consume about 20uA and between flashes is MCU in deep sleep with watchdog wake up, also when led is on is MCU in sleep to save power. With this setup can it flash hours and hours ...

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Simon Merrett wrote 12/03/2018 at 18:49 point

Thank you. 

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fabian wrote 07/21/2018 at 20:12 point

add solar panel and ... clock binary or normal.

very interestin project

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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.

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