by Ponoor Experiments

A 4-axis stepper motor driver for creative coders

View all updates Mar 12, 2021

Production is Done

by Kanta


I know it’s been a while since my last update, but here’s an update on the current status of the project.

Production and Fulfillment

The STEP400 product versions were successfully delivered from the PCBA factory in China. We tested and confirmed that all of them are working fine.

The optional electromagnetic brake boards and sensor cables have also been manufactured and delivered to us.

Packing in progress

The plan was to ship to Crowd Supply at the end of February, but it has been delayed somewhat and will be shipped next week. While manufacturing went on time, it has taken me a while to complete the firmware, as well as the administrative procedure of shipping. I apologize for the delay in the schedule.

New Places for the Repository and Documents

New Repo

We have set up a new repository for the product version of the STEP400. The older one is kept for the prototype, as an archive.

New STEP400 Repository:

Here you can find the design files for the final hardware and the firmware. The development of the firmware is on PlatformIO.


You can find a test Arduino sketch in the repo, but it was designed for the manufacturer. We have tested all PCBs in our side as well, we have confirmed that all of them can drive actual motors from OSC commands from a host PC. Also many peripherals were tested, including:

  • USB
  • sensor inputs
  • DC-DC converter
  • microSD slot
  • DIP switch
  • electromagnet brake board connector

New Docs

The documentation has been moved to this web site, but I haven’t been able to keep up with the firmware updates, so I will be working on updating it during March.

Firmware Updates

The major changes and additions to the firmware include the following:

  • Electromagnetic brakes functions
  • Enhanced error messages
  • The homing sequence can now be done with a single command, and various settings can be made, such as automatic homing at startup
  • Diagnostic function via USB: it is now possible to read the state and configuration of STEP400 from the serial monitor

Next Steps

The firmware writing, tests, and packing have been completed, but the administrative process will take a little longer. As soon as it is complete, we will ship it out to Crowd Supply.

We also will keep working on updating the documents.

A small notification: We are planning to hold a hands-on workshop for STEP400 at the Tokyo office of BASSDRUM, a technical director collective, on April 8. A number of participants are quite limited but you can join in from their zoom meeting room. Details will be announced as soon as we get confirmation.

About the Author


kanta  ·  kanta  ·   Tokyo, Japan

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Product Choices



A STEP400 board and four motor connectors


Electromagnetic Brake Board

A control board for stepper motors with an electromagnetic brake. To use this board, a motor with an electromagnetic brake is required and is not included.


Sensor Cable

Pre-crimped, ready-to-go sensor cable for connecting to the 4 homing and 4 limit sensor inputs on the STEP400 board. Includes one cable.


Ponoor Experiments

A big fun of electronics and magnets, explore them with many ways. 15+ years experience for kinetic projects in art, music and design engineering.


Taiki Niimi

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