Arduino compatible board with onboard stepper motor drivers
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StepDuino Schematic.pdf

Freetronics StepDuino

Copyright 2013 Freetronics Pty Ltd
Freetronics site:
Freetronics email:

The StepDuino is an Arduino-compatible board with two onboard stepper motor drivers, a 20x4 LCD, servo outputs, and an SD card slot. This makes it ideal for mechatronics projects such as small robots or 2D plotters.

It uses the same ATmega328P MCU as the Arduino Uno reference design, and includes an ATmega16u2 USB-to-serial converter just like the Uno. You can therefore program it the same way as you would an Uno, but with the benefit of all the extra features built in to the StepDuino.


  • 2 x 4-wire stepper motor drivers
  • 20x4 LCD
  • Micro SD card slot
  • Analog inputs for use with Nintendo DS touch screen or other sensors

You can view more online at:


The design is saved as an EAGLE project. EAGLE PCB design software is available from free for non-commercial use. To use this project download it and place the directory containing these files into the "eagle" directory on your computer. Then open EAGLE and navigate to Projects -> eagle -> StepDuino.


The specific terms of distribution of this project are governed by the license referenced below.


Licensed under the TAPR Open Hardware License ( The "license" folder within this repository also contains a copy of this license in plain text format.


Designed by Luke Weston ( and Jonathan Oxer (