Long time Pimoroni shopper, first time poster.
I’ve an idea for a nice low-compute 3D mouse or pointer which involves attaching a string or thread tether to my finger. A crucial step is that the tether should be a component which knows exactly the length of thread/string has been let out, so I know how far away my finger is. I’m imagining something like the retractable things lanyards have on them. I’m wondering, before I start constructing custom spools, whether anyone has had to solve this before?