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.

Why using Pro Mini board? Simply because it is the cheapest (about 2$) and the smallest design with Atmega328P. No need USB interface, just use one FTDI to upload your sketch for all of your projects.

Arduino Portenta X8 specs: PROCESSOR: NXP i.MX 8M Mini – 4x ARM Cortex-A53 core up to 1.8GHz, 1x ARM Cortex-M4 core up to 400 MHz: MICROCONTROLLER ...

The Nano ESP32 supports both Micropython and Arduino programming languages, providing a clear path for those already familiar with one platform to easily switch back and forth as needed.

“The Arduino Nano is a small, complete, and breadboard-friendly board based on the ATmega328 (Arduino Nano 3.x). It has more or less the same functionality of the Arduino Duemilanove, but in a ...

After analyzing the communication between the two chips, [Alejandro] pulled the S3P70F4 off the board and wired an Arduino Pro Mini 328 in its place. The Arduino was quite a bit larger than the ...