Microcontroller Boards
Keyboards & Input Devices
This project is launching soon.
Epi 32U4 is an Arduino-compatible, ATmega32U4-based microcontroller board with a pinout based on the Pro Micro. All pins are broken out to castellated holes with 1.27-mm spacing. We designed Epi 32U4 to accommodate noisy environments—even without voltage regulators—thanks to a ferrite power filter, a fuse, ESD protection, and surge protection. With an ATmega32U4 at its core, it can act as a USB device, which makes it perfect for keyboards and other space-constrained projects that require a compact controller.
Epi 32U4 | Pro micro | Elite-C V4 | Qwiic Pro micro | µduino | Beetle | PICO | |
---|---|---|---|---|---|---|---|
Manufacturer | Ping Hobbyelektronik | Various | Keeb | Sparkfun | µduino | DFrobot | Mellbell |
Footprint | 22.75 x 12.75 mm | 33 x 17.75 mm | 33 x 17.75 mm | 33 x 17.75 mm | 12 x 12 mm | 20 x 22 mm | 15.25 x 15.25 mm |
USB Type-C | Yes | No | Yes | Yes | No | No | No |
Castellated pins | Yes | No | Yes | Yes | No | Arguably | No |
IO available | 23 | 21 | 24 | 21 | 20 | 10 | 12 |
Voltage regulator | No | Yes | No | Yes | Yes | No | Yes |
Protective features | Several ¹ | None | None | None | Some ² | None | None |
Screw mounting | Yes | No | No | No | No | No | No |
Open Source | Yes | Yes | Unclear | Yes | Somewhat | Unclear | Unclear |
Availability | Soon | Plentiful | Available | Available | Unavailable | Available | Unavailable |
¹ Varistors for ESD and surge protection, a ferrite-bead power filter, and a low-pass filter for analog voltage reference.
² A low-pass filter for analog voltage reference.
Made by Rasmus at Ping Hobbyelektronik using Paul Tol's muted, colorblind-safe palette CC-BY 4.0 2023
You can find source files for Epi 32U4 in our GitHub repository. Source files for the previous version are also available.
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"[T]his new dev board called the Epi 32U4 might be the smallest ATmega platform we’ve seen so far."
"This tiny board is Arduino-compatible and offers USB Type-C connectivity, making it an excellent choice for makers and hobbyists."
"The board has many features that make it an excellent choice for many projects, such as robotics, home automation, and IoT."