Simple stepper motor driver that can be controlled via serial communication.
Most existing drivers I found did not support 3 switch or analog inputs, so I created this.
Mouser parts: https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=6cd5e76669
Micro: https://www.pjrc.com/store/teensy40.html
Driver: https://www.pololu.com/product/3768
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