• Epi 32U4’s diminutive size allows you to incorporate it into just about any project. You can solder it directly to a PCB or use the included headers for a less permanent mounting solution. It is also quite easy to hand wire, as it includes mounting slots that allow you to screw it down before you begin soldering.
• Epi 32U4 can act as a USB device, which makes it ideal for projects like compact keyboards, and its Type-C connector helps you future-proofs your designs. It also has more available IO ports than a standard Pro Micro, so it’s appropriate even for projects where space is not at a premium. Finally, its USB D+ and D- lines are broken out, in case your design requires a separate connector.

Features & Specifications

• ATmega32U4
• 16-MHz crystal
• Runs at 4.5 - 5.5 V for the 16 MHz version, down to 2.7 V at 8 MHz
• Castellated pins at 1.27-mm spacing
• ESD and surge protection on USB data lines and power input
• 500-mA polyfuse
• Ferrite bead for power filtration
• Low-pass filter for analog voltage reference
• 24 available IOs
• Protruding USB Type-C port with mounting slots beside it
• LED on pin 13
• Made in the EU

Pinout Diagram:

Risks & Challenges

We’ve planned everything thoroughly, but since this is our first campaign, unexpected developments may arise. Part shortages are of course a risk, but availability looks quite good at this stage, and we are prepared to make substitutions if necessary. Our PnP machine is new to us—and a relatively new device in general—so it may take us some time to dial it in properly. Should any of this become too much of a burden, we also have a relationship with a local company that specializes in electronics design and manufacturing. If necessary, we can contract with them for PCBA.

Support & Documentation

• You can find source and documentation files for Epi 32u4 in our GitHub repository.

Package Includes:

• 1 x Epi 32U4