The official Arduino Nano design has been updated to version 3.0. Like other new Arduino designs, it’s using the ATmega328 instead of the ATmega168. It’s also a slightly more reasonable $35.

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.

The Arduino Nano is powered by an Atmel ATmega328. It's an 8-bit AVR microcontroller that operates at a clock speed of 16 MHz and comes with 2 KB SRAM, 1 KB EEPROM, and 32 KB flash memory.

The tutorial for the Arduino Nano weather shield has been published to the Seeed Project Hub and has been classed as an expert level project which should take approximately two hours to complete.

Watch this video on YouTube. “The Arduino Nano is a small, complete, and breadboard-friendly board based on the ATmega328 (Arduino Nano 3.x).

Fortunately, though, a decent spot welder isn’t that tough to build, as [KaeptnBalu] shows us with his Arduino-controlled battery spot welder.

It’d probably be unrealistic to expect a handheld computer powered by an Arduino Nano to do much more than that. It’s a tiny board with a 16 MHz ATmega328 microcontroller 32KB of flash memory ...