The Arduino Nano itself is the most basic and oldest of ... with a length of 68.6 mm and a width of 53.4 mm. With its ports, the Uno stands at a total height of 15.4 mm, although with all the ...
Although a “CommsLink” module providing an RS-232 port was available back in the day, it’s become hard to find, inspiring [James] to design a completely new module based on an Arduino Nano.