> For the complete documentation index, see [llms.txt](https://docs.acrome.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.acrome.net/electronics/smd-blue.md).
# SMD Blue
The Stepper DC Motor Driver
The **Acrome SMD Blue** is a compact and powerful motion control device designed specifically for driving **stepper motors** with high precision and stability. Developed by **Acrome**, it enables smooth, reliable motion control for applications that require accurate positioning, such as **robotic arms, CNC systems, 3D printers**, and various **automation platforms**.
With support for **step, direction, and enable signals**, SMD Blue ensures compatibility with a wide range of external stepper motor drivers. It communicates via **RS-485** and features **RJ-11 ports**, allowing users to connect a variety of **plug-and-play add-on modules** such as distance sensors, joystick controllers, RGB LEDs, and more—without the need for complex wiring or configuration.
SMD Blue is compatible with both **visual programming tools like SMD Blockly** and **text-based environments such as Python**, making it ideal for students, educators, researchers, and developers alike.
Whether you're building a precise linear motion system or developing advanced motion control algorithms, **SMD Blue delivers the flexibility, performance, and modularity you need for stepper-based motion systems.**
