Coin cell battery emulator CR2016/CR2032

Disappointed purchasing new batteries for development?
Do you need measure current and consumption of your device?

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This simple hack save planet :D or maybe your wallet ....

- It is just small round piece of board
- micro USB for delivery power
- 3V regulator
- alligator clip holes for your multimeter to measure curent
- single board with micro usb is CR2016 =1.6mm + adapter is CR2032 = 3.2mm ... EASY ?????I

understand is not like real CR2032 but I believe that help with development battery operated devices.

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manta103g wrote 06/19/2018 at 19:48 point

I really love all your projects at
but what I really need is PCB to read a single solar cell 0.5V 8A input and
give useful 5V , 12V voltage as output
or serve as a Li-Ion cell charger

Not sure if any of your other Joule thief projects could be redesigned to accept 0.5V as input

operating voltage: 0.9V-1.5V
output current adjusted to: 5mA
input current : 15mA

So the question is how to turn 0.5V  8A (4W) input into  5V 0.8A output  .


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bobricius wrote 06/19/2018 at 19:54 point

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manta103g wrote 06/19/2018 at 20:08 point

thank you
400mA Step-Up DC/DC only
in theory I can boost voltage with lens concentrated cell
but still too much energy wasted
China manufacturers can cut 8A 0.5V single solar cell into smaller parts connected in serial to boost output voltage
Unfortunately, either cutting or soldering is heavy
I have tried to order pre-soldered solar cell strings from solar company to get it laminated.
Unfortunately, growing solar modul in size, laminating is more expensive and complicated and there is a higher risk of getting the job broken easily.
So I would love a single solar cell DC DC step up inverter one day

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K.C. Lee wrote 06/19/2018 at 20:09 point

You'll need to think beyond Joule thief as it isn't practical for that kind of wattage nor that voltage.

I am working on my project, but don't think it would deliver 4W.  I am guessing 0.5W (or may be a bit higher) might be a realistic number.  I don't have the answer until I try.  0.5V is not an easy voltage to work with as most common parts do not work on that natively.

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manta103g wrote 06/19/2018 at 20:27 point

thank you

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manta103g wrote 06/19/2018 at 19:29 point

what about rechargeable coin battery, coming with solar keyboard ?

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bobricius wrote 06/19/2018 at 19:55 point

It is ML2032

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manta103g wrote 06/19/2018 at 20:05 point

exactly, you offer charger for ML2032 coin cells

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C. Dodd wrote 09/19/2017 at 03:23 point

I agree with Marian (above).  Resistance of coin cells is something integral to several circuits.

Also, the Tindie price is quite high for such a simple board.

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oshpark wrote 09/18/2017 at 18:52 point

Great idea!

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deʃhipu wrote 09/13/2017 at 12:45 point

I think you just invented a pretty interesting connector in there...

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bobricius wrote 09/13/2017 at 12:49 point

lollipop :D

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Marian Keller wrote 08/22/2017 at 09:08 point

Now make the output voltage adjustable and add an adjustable series resistance, and this would be really helpful in development.

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