UNO R3 Arduino Documentation

Arduino UNO Board Anatomy

Overview - Digilent Reference

Uno R3 with ATmega16U2 USB - ProtoSupplies

Arduino WiFi Shield Arduino Documentation

Arduino Uno Rev3 — Arduino Online Shop

Arduino® UNO R4 WiFi — Arduino Official Store

Arduino Tre Arduino Documentation

Getting started with Arduino UNO R3

Arduino Uno R3 Specifications/Functions