Inside the 3D printed enclosure is nothing more exotic than an Arduino Pro Micro and five Cherry MX Red switches.

Hooking it up is easy—an on-the-go adapter allows the Switch’s USB-C port to connect directly to the Arduino’s Micro-USB port, even supplying power!

PD Micro is the first Arduino-compatible board with USB Type-C Power Delivery, which allows your project to make use of voltages from 5-20 V.