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Big Easy Driver

Big Easy Driver

  • 1995

The Big Easy Driver, designed by Brian Schmalz, is a stepper motor driver board for bi-polar stepper motors up to a max 2A/phase. It is based on the Allegro A4988 stepper driver chip. It’s the next version of the popular Easy Driver board.

Each Big Easy Driver can drive up to a max of 2A per phase of a bi-polar stepper motor. It is a chopper microstepping driver which defaults to 16 step microstepping mode. It can take a maximum motor drive voltage of around 30V, and includes on-board 5V/3.3V regulation, so only one supply is necessary. Although this board should be able to run most systems without active cooling while operating at 1.4-1.7A/phase, a heatsink is required for loads approaching 2A/phase. You can find the recommended heatsink in the related items below.

Note: This product is a collaboration with Brian Schmalz. A portion of each sales goes back to him for product support and continued development.


  • Bi-polar Microstepping Driver
  • 2A/Phase Max
  • 1.4-1.7A/Phase w/o Heatsink
  • Max Motor Drive Voltage: 30V
  • On-board 5V/3.3V Regulation


Brand: Sparkfun
Brand Part Number: ROB-12859
Our Part Number: h5907


EasyDriver - Stepper Motor Driver
Unipolar Stepper Motor w/ 1.8 Degree Steps
Stepper Motor - 68 (400 steps/rev)
Screw Terminals 3.5mm Pitch (2-Pin)
Stepper Motor - 29 (200 steps/rev, Threaded Shaft)
Small Stepper Motor

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