This breakout card for stepper motor driver based on Allegro A4988 has an adjustable current limiter, overcurrent and overheat protection and five different microstep resolutions (up to 1/16 steps).

It operates from 8 V to 35 V and can supply up to about 1 A per phase without heat sink or air flow (it is given for 2 A per coil with sufficient additional cooling).

This card is delivered assembled with a connector and a heatsink.