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You would probably like the raindrop powered electronics project.
Chua, K., HOR, Y., & Lim, H. (2016). Raindrop Kinetic Energy Piezoelectric Harvesters and Relevant Interface Circuits: Review, Issues and Outlooks. Sensors and Transducers, 200, 1–15.
My full thesis is now available online, for download-only, not reposting:
Energy Harvesting Information Systems and Design in the Energy Transition
https://tspace.library.utoronto.ca/handle/1807/130114