A better "instrument" would have been LED(s). Real power, more blinky blinky. You could even attach a ultra lower power microcontroller dev board to it[1] and

A better "instrument" would have been LED(s). Real power, more blinky blinky. You could even attach a ultra lower power microcontroller dev board to it[1] and show the less technical audience "look! computer powered by spooky magic!" 1: like this: https://www.silabs.com/products/mcu/lowpower/Pages/efm32gg-stk3700.aspx https://www.silabs.com/products/mcu/lowpower/Pages/efm32gg-s... super low power microcontroller demo board that runs off of all sorts of energy harvesting rigs like tiny solar cells, thermoelectric piles, and so on.