A4988 Stepper Motor Driver

Helping out a friend with a new laser engraver led to me having to debug the circuit containing the A4988 Stepper motor driver.

Whilst doing that I used the following circuit and code on a Arduino UNO to test the various components.


The circuit use the following baseline from the Pololu website

Things to note:

It is important that VMOT be in the 8-35V range (I use 12V)

The Circuit used:

 

And the code:

Loading Gist: https://gist.github.com/madmouser1/dc271f3ed70175d9bd8c0b6b4edb50b7