A better &quot;instrument&quot; would have been LED(s). Real power, more blinky blinky.<p>You could even attach a ultra lower power microcontroller dev board to it[1] and show the less technical audience &quot;look! computer powered by spooky magic!&quot;<p>1: like this: <a href="https:&#x2F;&#x2F;www.silabs.com&#x2F;products&#x2F;mcu&#x2F;lowpower&#x2F;Pages&#x2F;efm32gg-stk3700.aspx" rel="nofollow">https:&#x2F;&#x2F;www.silabs.com&#x2F;products&#x2F;mcu&#x2F;lowpower&#x2F;Pages&#x2F;efm32gg-s...</a> 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.