So it was a long time since i wanted to play with a supercapacitor. I found a good deal on ebay for some 4F, 5.5V capacitor.
The first thing i made is a micro flashlight. It's basically a single super bright (i think 10k mcd) LED with a 660 resistor, a custom USB plug for recharging, and a small switch to turn it on and off.
I made this to see how much juice these supercapacitors could hold. Well, the final result is: a lot :) Powering it for a two or three minutes will keep the led at good brightness for a couple of hours, after that it starts to fade but it's still "light" for more hours, gettin dimmer and dimmer :)
It turns out it's quite a useful flashlight :) with the usb port it can be recharged almost anywhere, the capacitor doesn't have memory effect or loss of capacity over time like batteries, so it's just "plug" at any time without worrying and use it :P
have you the opportunity to test your supercap with a pager motor? do you think that is suitable for power a small robot? can you provide infos about charge and discharge current of your cap?
