⚙️ Introducing Interface C — A Modern Motor Speed Controller for LEGO® Power Functions ⚙️

[diegobaca]

I’m excited to share that Interface C is now available.
It’s a modern take on the classic LEGO® 9V Train Controller (4548), designed to give builders precise speed control and versatility — perfect for powering Technic creations, Great Ball Contraptions, and custom motorized builds.


Interface C with Dark Bluish Gray, Light Bluish Gray, and Orange - LEGO® Power Functions colorway.

🔧 What It Does

• Provides six-speed precision control — forward or reverse — with a smooth rotary dial.

• Connects directly to LEGO® Power Functions motors, letting you breathe new life into old builds.

• Remote control via web interface, allowing you to manage motors wirelessly over Wi-Fi.

• Fully compatible with Windows and Mac through the Interface C Utility for firmware updates and configuration.

• USB-C port for firmware flashing and diagnostics.

🛠️ How to Get It

Interface C is available in multiple options depending on how hands-on you want to get:

• Full Kit A — includes the microcontroller.

• Full Kit B — without microcontroller, for those who want to customize.

• Fully Assembled Unit — ready to use out of the box.

Each kit includes high-quality parts, assembly instructions, and access to digital resources — even STL files to 3D print your own housing.

Learn more and get your kit at 👉 https://interface-c.com


LEGO® 9V Train Controller (4548) compared to the Interface C with Light Bluish Gray, Black, and Yellow colorway.