The Micro's bootloader is also bigger at 4 KB, so you can only use smaller sketches with this board compared to the Nano. The main advantage of the ATmega32U4 is that it can communicate over USB ...

The Arduino Nano uses a bootloader for handling programming the MCU, which requires the USB to serial bridge to be disconnected from anything that could interfere with the programming.

The board is built around an ATtiny3217 and has almost all of the Nano’s features, like a USB port, reset button, built-in LEDs, 5 V regulator, and preloaded bootloader.

The power of Espressif’s ESP32-S3 meets Arduino’s unmatched customer experience, documentation and community — all in the compact form factor of the Nano. Provides support for both ...

Four new Nano boards join Arduino's lineup. Written by Liam Tung, Contributing Writer May 20, 2019 at 6:10 a.m. PT.

While relatively old, the Arduino Nano is still priced at $24.90, ... On the Uno, only 0.5kB of flash memory is used up by the bootloader, unlike the 2kB used on the Nano.