The Arduino Nano itself is the most basic and oldest of the group, and just like its many iterations, it's designed to work primarily with breadboards, making it a great tool for prototyping.

While the pinout is very similar to the Arduino Nano’s, there are four (12-bit) analogue inputs rather than eight (10-bit). Some digital GPIO pins are numbered differently too.

Arduino Nano R4 pinout diagram Two SKUs are offered for the Arduino Nano R4: ABX00143 with headers ideal for breadboard projects ($13.30) and ABX00142 without headers ($12.10) to solder the board to a ...