Available as an assembled Module and as a DIY project.
This Module is currently available.
Spinner Pickup LFO for controlling Modular gear
Deftaudio Spinner LFO is a simple DIY kit based around a fidget spinner and a double bass pickup.
This module is fully passive and requires no external power.
It can be used as an oscillator source, where the frequency is based on the rotational speed.
To control other CV inputs, you need to amplify the signal coming from it, such as with a pre-amp (ex. built in Behringer 2600.)
Any other pre-amp, mixer and a guitar pedal will work too.
Introductional Video below.
https://www.tindie.com/products/deftaudio/fidget-spinner-eurorack-lfo-oscillator-spinnerlfo/