Arduino library for pneumatic stepper motors and servo valves.
Pneumatic stepper motors are controlled using pneumatic valves, which can be commercial 5/2-way valves (e.g. PV5211-24VDC-1/8 or Festo stuff etc) or low-cost RC servo valves (https://www.thingiverse.com/thing:3655215)
Servo valve files & assembly on Thingiverse: https://www.thingiverse.com/thing:3655215 Video: https://www.youtube.com/watch?v=523QuGY_VwU
3D printable pneumatic stepper motor overview by the author: https://www.vincentgroenhuis.nl/wp/home/2019/10/11/stepper-motor-overview/