When you need to make very tiny measurements, even noise in closed relays can throw you off. [Marco] was able to observe this effect and wanted to build a switch that didn’t have this problem. He found a technical paper that used rotary switches operated by stepper motors instead of relays. So he decided to try making his own version. The video below shows how it turned out.
This is a companion discussion topic for the original entry at https://hackaday.com/2024/05/27/reinventing-rotary-switches-with-stepper-motors/