Great post. See below.
“I would like to see data on generation of power using piezo materials, conversion efficiency, and energy storage. Then add your constraints, such as the size of a shoe. What is your target, enough power to do what?! Notice how I don’t use voltage or current. It is because power is the end game. You showed a video of voltage generated when compressing piezo materials. What was the current? How much of that energy made it to the battery as stored energy? Definitely do your research, especially if the majority of your proposed work has already been done. How much energy do you think you could get from spinning a micromotor using a compressed chamber of focused air?”