This breakout board for Allegro’s A4988 microstepping  bipolar stepper motor driver features adjustable current limiting,  over-current and over-temperature protection, and five different  microstep resolutions (down to 1/16-step). It operates from 8 V to 35 V  and can deliver up to approximately 1 A per phase without a heat sink or  forced air flow (it is rated for 2 A per coil with sufficient  additional cooling).

Here are some of the driver’s key features:

• Simple step and direction control interface
• Five different step resolutions: full-step, half-step, quarter-step, eighth-step, and sixteenth-step
• Adjustable current control lets you set the maximum current output  with a potentiometer, which lets you use voltages above your stepper  motor’s rated voltage to achieve higher step rates
• Intelligent chopping control that automatically selects the correct current decay mode (fast decay or slow decay)
• Over-temperature thermal shutdown, under-voltage lockout, and crossover-current protection
• Short-to-ground and shorted-load protection