It would work better with strongly typed languages. But seriously, thin film piezos charging a battery? They would be better suited to wide area sensors like flexible keypads and electronic whiteboards.
I agree, Duane. I've wondered why physical fitness clubs like 24-hour, etc., haven't found a way to harvest energy from people using gym equipment during their workouts. With all of the treadmills and ellipticals in use at any one time, you'd think there'd be an opportunity there somewhere.
Yeah...I am not able to understand the practical application of the energy harvested using the keyboard. Keyboard of what?...a laptop, or a PC? Where will you use that minute amount of energy? I think a real-time example would be helpful.
A keyboard seems like an odd place to be looking at energy harvesting. The math also doesn't seem to add up to me. if 200pA is 10x too small, what is 2nA enough current to do? The amount of harvestable power seems far more than a single order of magnitude too small.
A better place to look might be in overall body motion; bending elbows and knees, for example.
Great comment, Frank! I suppose that the touch measurement will be time as well as pressure dependent and thus fast-to-the-draw typists will save more energy for their machines. I bet analog engineers might win with on-screen keyboards depending how quickly they can handle the mouse :):)