I've tried looking around for as much information as I could gather to build really small wearable electronics that could power themselves by generating energy with movement.
I know that the technology already exists in watches. There are watches that produce their own energy using a small generator that spins when the wearer moves its arm around. The energy is stored in a capacitor to make the watch work quasi-infinitely as long as the wearer moves enough throughout the day so that enough energy is generated. (some info here : http://en.wikipedia.org/wiki/Automatic_quartz )
I have trouble finding information about just how much current can this technique output for practical uses and if this technique can be adapted to work with other electronics.
In spirit of actually having real questions and not just vague stuff, here's a couple of questions I hope can get answered
- How much energy can these devices produce / store?
- Is there any other devices aside from watches that are powered using only kinetic energy?
- Is there any schematics on how to create a kinetic generator for low-power devices?
Edit : Some people have said that it is hard to determine if it's possible since I didn't mention exactly what I would be doing. I don't have any project right now but I want to play around with wearable electronics that are motion-powered instead of battery-powered that you need to replace or recharge.
I'm thinking of using the lowest-power MCU I can find (something like the IT MSP430 microcontrollers) and reduce the current usage to the maximum by using standy mode as much as possible and doing very little active work, maybe just for logging multiple sensor data every couple seconds.