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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Ahh - using a geared motor and gravity makes a lot of sense. If you still had trouble with the new motor you could add a counter-weight I guess.
I actually had a lot of success with a solar powered USB power bank. Sometimes you might not want to use the USB output directly (Espruino can draw so little power that some of them think nothing is connected and turn off), but it's usually trivial to crack them open and connect straight to the battery - and you've then got a really nice, convenient unit with loads of power.