Discontinued.
Arduino Uno R3 Microcontroller
The Arduino UNO R3.0 kit Download Scientific Diagram
Arduino Uno R3 - AzureFilm
Buy Arduino Uno R3 Clone - Best Price + Free Shipping
Arduino UNO R3 and R4 Minima
Enhanced and improved, the Arduino UNO R4 Minima is armed with a powerful 32-bit microcontroller courtesy of Renesas. Brace yourself for increased processing power, expanded memory, and a whole new level of on-board peripherals. The best part? Compatibility with existing shields and accessories remains intact, and there's no need to make any changes to the standard form factor or 5 V operating voltage.
Arduino Uno R4 Minima - ABX00080
Review] The cheapest Arduino Uno R3 compatible: VISduino - Bar Sport - Arduino Forum
Arduino UNO SMD REV3 [A000073] : Electronics
UNO R3 + WIFI ESP8266 + CH340G Arduino and WIFI - a Versatile Development Board : 6 Steps - Instructables
UNO R3 Arduino Documentation
