open-source

UNO R3 reference board

The classic socketed ATmega328P board, with USB programming, automatic power selection and the familiar shield connectors.

Remix this board → View source on docs.arduino.cc ↗

License: CC BY-SA 4.0
Source revision: UNO-TH Rev3e
Last mirror: Sep 10, 2026
Git commit: 7a9e7c9a4a3a

About UNO R3 reference board

The classic socketed ATmega328P board, with USB programming, automatic power selection and the familiar shield connectors. Original two-layer design for adaptation to ViaGrid; rerouting and testing are required.

Published design files

Development & tools · two copper layers
Open source (CC BY-SA 4.0) · Arduino
Mirrored at 7a9e7c9a4a3a

Canonical source stays in the upstream git repository (and in WalGit after a successful mirror push). Generated renders and 3D models use artifacts/viagrid/uno-r3/532b306cb153846eafc0ca9fe991d7a4dfa0c52dcefafa2efeaebf4b845ec820/08f7561885b3bf57 on the artifact CDN and are not checked into git.