Supercapacitor as a battery

I like supercapacitors. I think they are cool and I wanted to try to use one as a battery that I could recharge in seconds. I also like the challenge of using as little power as I can. So a while back I ordered some supercapacitors from digi-key to play with.

Powering a Microcontroller

The first thing I did was plug them up to a bread board and get them charged. Then I hooked one up to power an ATTiny85. It worked like a charm and ran a rather long time for a supercap. It was a simple Halloween flickering light thing. Unfortunately I don’t have any pics to post on here. But the proof of concept works. I bet lots of small microcontrollers could run off supercapacitors!

Supercapacitor Flashlight

Then I decided I wanted to try keeping it charged with solar and make a little key-chain light. So I found some mini solar cells and got 10 of them to make 5 volts. Then a little signal diode to prevent discharge back into the solar cells and made this little thing.

Supercapacitor Flashlight

It’s bright enough to use as a flash light to get around in a dark house in the case of a power outage or something. It also last about 10mins. So that’s not bad when using a capacitor as a battery.

Supercapacitor Flashlight

Here you can see the back side with the 5.5 volt 1 farad capacitor.

Supercapacitor Flashlight

I still need to clean it up and maybe 3D print a case for it. Then I could make it into a key chain.

I don’t know how practical it is. It might be good for unlocking your door at night. But it was a fun little project. Capacitors charge fast so I bet the solar cells will keep it ready to go all the time. So far I just leave it on my desk and it’s always charged when I turn it on.

Join The Community

I hope you enjoyed this post! I'm always trying to post new and helpful things! If you like what you see then I'd love to be able to send you more! Please subscribe to my newsletter so that I can send you updates.

Leave a Reply

Your email address will not be published.