Retired Electronics Engineer;

Learnt my Trade when :

• NPN and PNP had significant meaning,
• a soldering Iron was often needed
• complicated systems had lots and lots of PCBs
• fault finding often required an oscilloscope rather than a laptop.

Over the 40 years saw huge changes in hardware and software which only helps a little in sussing out R Pi hardware and software.

Now playing with

• 1 R Pi 3 (shit! this thing is like using an "real PC")
• 2 R Pi Zero (favorite thing for the little projects that I am getting in to)
• 1 ancient R Pi 1 poor little thing must be psychologically scared by years of neglect in a dark drawer
• 1 newer R Pi 2 (now that's better, now enough USB sockets)