The Arduino Nano and Uno are equipped with very similar processors (the chip that essentially serves as the brain of the board). The Nano features an ATmega328, while the Uno sports an ATmega328P.

Arduino Uno R4 WiFi comes with built-in Wi-Fi and Bluetooth capabilities, ... it's still slightly cheaper than the R3 at $27.50. A Different Microcontroller. Arduino Store.

Arduino Uno - The World's Most ... Preserving the standard form factor, shield compatibility and 5 V power supply of the popular UNO R3, the UNO R4 adds a 32-bit microcontroller with up to 16x the ...

It includes the UNO R3 microcontroller, a reasonable assortment of components, ... Arduino UNO, MEGA2560 and NANO are the most common boards, but many others are available.

Arduino will continue to make available the Arduino UNO R3 and provide support to all those Arduino enthusiasts that have and would like to create projects using its 8-bit AVR microcontroller.

“With the ever-changing needs of our community and technological advancements, even the most popular UNO R3 must evolve, though we have no plans to discontinue the board,” said Arduino co ...

The Arduino Uno-compatible board has an MCS-51 (often called 8051 instead) instead of the usual ATmega328P/ATmega168. Specifically, [ElectroBoy] uses the AT89S52 .