A4988 Micro-Stepping Driver with Arduino Uno

In preparation for some upcoming projects, I wanted to get a bipolar stepper running with the A4988 microstepping driver for full step to 1/16 microstep control.  

Here's how to get it running with Arduino Uno, including how to determine the pinouts for the four stepper wires if you don't know what they are.

Arduino Sketch and wiring diagram:
https://github.com/GadgetReboot/Stepp...

Bare PCBs (no components) for the breakout accessory board with the switches/LEDs/pots can be bought from PCBWay here:  https://www.pcbway.com/project/sharep...

A4988 info:
https://allegromicro.com/en/products/...
https://www.pololu.com/product/1182

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