Small portable soldering irons are all the rage so ... to avoid having to open the 3D-printed case too often. On the PCB is an Arduino, a MOSFET, and some instrumentation to monitor the battery ...

Actually, the last thing the world needs is another Arduino ... an exercise in PCB design, we’ll give this a thumbs up, but this could also be used for an ‘introduction to soldering ...

Below we see the setup on my kitchen table when I was soldering stackable headers onto an Arduino Nano: In fact, this ties in neatly to my recent column: Basic documentation — is it too much to ask ...