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Robotics & Motors


A 4-axis stepper motor driver for creative coders

$20,551 raised

of $3,500 goal

587% Funded! Order Below

Funding ended on Nov 05, 2020 at 03:59 PM PST.

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STEP400 is a 4-axis stepper motor driver designed for creative applications. An Arduino Zero, Ethernet shield, sensor inputs for homing and limiting, and four stepper motor drivers are combined elegantly on one PCB board. Then we provide a simple and creative coding environment to generate motion.

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STEP400 works especially well with Open Sound Control (OSC) via Ethernet. OSC is a common protocol for creative coding environments, so if you are familiar with environments like openFrameworks, Processing, Max, Unity, or Touch Designer you can easily generate smooth and precise motions with simple the Open Sound Control (OSC) protocol through an Ethernet cable.

STEP400 is also compatible with the official Arduino IDE Ethernet library so you can write your own code, too.


STEP400 can drive 4 motors, from tiny to high powered ones. It uses STMicroelectronics PowerSTEP01 as driver chips. A single OSC command can generate positioning motion or constant speed rotation. Two drive modes are available: a smooth and accurate voltage mode, and powerful current mode, which can be used to drive high speeds.

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An open loop servo mode is available to track the target position stream in real time, like an RC servo. A simple configuration tool generates a readable JSON file, which can be loaded via a microSD card. Ethernet connectivity allows for the system to be easily scaled up.

Features & Specifications

Open Sound Control (OSC) Protocol

The standard way of controlling stepper motors is with industrial Ethernet, which lacks compatibility with general network devices as well as open specification. This makes it more time-consuming than necessary to use it for any purpose other than factory automation.

Since STEP400 is a stepper motor driver designed specifically for creative applications, it uses the simple and easy-to-use OSC protocol to solve this issue. Open Sound Control (OSC) is an open-ended, dynamic, UDP-based protocol with a URL-style symbolic naming scheme . It is widely used in the field of electronic music and new media art.

Control of STEP400 involves Arduino Zero and Ethernet shield elements. You are free to decide how to control it. For instance, you could rewrite the Arduino sketch to be controlled by Artnet or WebSocket, or by basic USB serial data.

STEP400 Board Layout

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1MCU, ATSAMD21G18A, Works as Arduino Zero.
2MicroUSB connector. Might get replaced with USB-C connector.
3Ethernet controller W5500. Compatible with the Arduino Ethernet Library.
4RJ45 connector with magnetics for Ethernet connection.
5microSD card slot. A JSON configuratin file can be loaded from here.
6HOME sensor or switch input with 5V power output. JST XA (B03B-XASK-1)
7LIMIT sensor or switch input with 5V power output. JST XA (B03B-XASK-1)
83.81mm pitch Euro style pluggable terminal block for bi-polar stepper motor.
9Stepper driver chip, STMicroelectronics PowerSTEP01.
1016MHz crystal oscillator to synchronize all driver’s clock.
115V to 3.3V LDO
12Step down buck converter. Input range : 12V to 75V, output 5V. ROHM BD9G341AEFJ
13P-MOSFET for reverse polarity protection.
14Power input screw terminal, 3mm screw. Input voltage range : 12-72V
15DIP switch to set ID.
16SWD connector to program SAMD chip.
17A new box header will be placed here where some vacant pins of the MCU will be connected. It can be used for connecting the add-on brake board, or for general purposes.

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Each STEP400 board will come with four motor connectors.

Add-On Options

Electromagnetic Brake Board Add-On

An optional control board for stepper motors with an electromagnetic brake is available. It is easy to connect to the main board. An electromagnetic brake is only unlocked when the power is energized, so it can safely hold the load when the system shuts down or the power supply is unexpectedly cut off. To use this board, a motor with an electromagnetic brake is required and is not included.

Sensor Cable Add-On

The homing and limiting sensor connectors are JST XA. This style of connection is handy, readily available, and easy to attach, detach, and extend.

It is, however, necessary to crimp the terminals to the cable if you are making this connector at home. Crimping the terminals requires a bit of experience and some tools, which can be a hurdle for smaller projects. Because of this we are providing a cable with a connector crimped on one end as an add-on option. The other end of the cable is cut off and can be used to solder any sensor or switch.


STEP400 SlushEngine Model DWiFi Stepper
Number of axis4 71
Motor DriverPowerSTEP01 L6480 x3, L6470 x4PowerSTEP01
Input Voltage12-72V 9-35V9-80V
Output Current5A 20A for L648010A
ControllerATSAMD21G18A N/A (external)ESP8266
Develop EnvironmentArduino Raspberry PiArduino
ConnectivityEthernet SPIWiFi
Sensor InputHome, Limit HomeHome
Price$250-300 $99$65

Born From The Needs Of Real Projects

STEP400 comes out of a number of projects we have done with stepper motors. We initially built the system using a combination of DIY modules, but as the system scaled up, the wiring became chaotic, causing all sorts of problems due to the unstable connections between modules and the length of the digital signal path.

After some struggles while working on projects, we realized that we should design a dedicated driver board that would put together everything we needed. Prototypes of STEP400 were created for our own purpose and have been used, tested and validated in a wide variety of real-world projects.

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Photos courtesy of TASKO Inc, anno lab, invisi., and dot by dot inc.

STEP400 In Action

Here are some examples of projects created with prototype versions of this board:

dot by dot | Flower Mirror

invisi. | Medium

WOW | Emerge

Development History

We originally developed a board to control eight small stepper motors. STEP400 was based on this design with a goal to control fewer, yet larger, motors. With this project, we aim to deliver a production version based on our current prototype. The original board that controls the eight motors will continue to be developed as a separate model called STEP800.

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Open Source Support & Documentation

This repository is temporary and will be cleaned up and migrated to a new location during the campaign.

Manufacturing Plan

We have manufactured 50 copies of the prototype in its 4th revision and are now field-testing them ourselves and via beta testers. We might make some minor improvements to the current design after field tests, in which case one more test PCB will be fabricated before placing the final order. This process would take some time. We plan to use a one-stop service for PCB manufacture and assembly, and for this purpose we have been in contact with several companies in China. The production process will take 1 month. We expect to complete production by January 2021, followed by tests and packing in Tokyo, and we will be ready to ship the product to Crowd Supply by the end of February 2021. From there, Crowd Supply will handle order sorting and distribution. You can learn more in the Crowd Supply Guide.

Fulfillment & Logistics

STEP400 will come with 4 Euro style terminal blocks for stepper motor connectors, and 4 small heatsinks for the driver chip. They will be delivered to Crowd Supply’s warehouse for final distribution to backers worldwide. Please see the Crowd Supply Guide for information about VAT and Customs.

Risks & Challenges

There are no replacement parts for some components in STEP400. Depending on their availability, this could cause a delay in production. We will work with a PCB assembly manufacturer to prepare alternative suppliers to ensure that the manufacturing process is not delayed.

Furthermore, although we do have extensive experience in developing dedicated devices for a wide variety of projects, we do not have much knowledge of large-scale import, export, and sale. We will continue to work hard on the import/export documentation and certifications to ensure that there are no issues with logistics.

STEP400 is part of Microchip Get Launched!

In the Press

Produced by Ponoor Experiments in Tokyo, Japan.

Sold and shipped by Crowd Supply.


A STEP400 board and four motor connectors

$300 $8 US Shipping / $18 Worldwide

Want to buy this item? Check the current project page for the latest information.

STEP400 x2

Two STEP400 boards and eight motor connectors (four for each board). Save on shipping!

$540 $8 US Shipping / $18 Worldwide

Want to buy this item? Check the current project page for the latest information.

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.

$5 $8 US Shipping / $18 Worldwide

Want to buy this item? Check the current project page for the latest information.

STEP400 - Early Bird

One Early Bird STEP400 board and four motor connectors. Be one of the lucky first 10 backers to save big on a STEP400 board! (Will not arrive earlier then other pledge levels)

$250 $8 US Shipping / $18 Worldwide

Want to buy this item? Check the current project page for the latest information.

About the Team

Ponoor Experiments

Tokyo, Japan  ·

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

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