A Self-Contained Solution for Stepper Motor Testing

Driving a stepper motor certainly isn’t difficult, but it can be a pain when you just want to run a quick test. You’ll need a microcontroller development board, a stepper driver module, a separate power supply, and some time spent refreshing your memory on how to wire everything together. Then you’ll need to track down the right libraries and write some firmware to run the tests you are interested in.

And if things go wrong, it won’t be immediately clear if the motor is at fault, or if it’s your driving circuit that’s to blame. All you wanted to do was see if you could make a stepper spin on command, and it ended up wasting all of your hacking time for the day. If you’ve ever felt this pain, then a new DIY tool called StepUp! might be just what you need. It’s a low-cost, battery-powered handheld device for quick testing and development work with any size stepper motor.

Designed with simplicity and immediacy in mind, StepUp! aims to strip away the usual setup overhead and replace it with a self-contained, intuitive experience. Instead of juggling bench supplies and firmware uploads, users can connect a motor directly and begin testing using onboard controls. The device is particularly useful for diagnosing common issues such as damaged cabling, shorted or open coils, or determining whether a motor is jammed or capable of holding current.

The handheld unit is powered by a dual-core Arm Cortex-M0+ microcontroller running at up to 133 MHz, paired with 264 KB of SRAM and 2 MB of flash storage. The firmware is built on Pico-SDK v2.2.0 and leverages FreeRTOS v11.2.0, giving the device enough flexibility to handle responsive motor control while maintaining a straightforward user interface.

Power comes from a single 18650 lithium-ion battery, making the unit fully portable and independent of external supplies. StepUp! can deliver approximately 10.2 volts at 500 mA — about 5.1 watts — providing enough power to meaningfully test a wide range of stepper motors. Battery life is reported at around 5.5 hours when using a 3,400 mAh cell, making it suitable for extended bench sessions or field diagnostics.

While there are many stepper motor driver boards on the market, few offer a fully integrated, battery-powered solution with direct user input controls. StepUp! fills that niche, offering a purpose-built tool for quickly answering the most basic — and often most frustrating — question in stepper control: does this motor actually work? For about $50 in parts, this question can now be easily answered.