donkshop wrote: ... is the Gertboard compatible with Pi 3?
Yes... the Gertboard will work with the 40 pin PIs (uses first 26 pins if plugged in) and is 100% compatible, except that the Gertboard pin 21 is actually PI pin 27; however ...
... I have learned that the best way to use the Gertboard with the PI2B and the PI3B is to NOT plug it into the PI ! Use the little nylon stand-offs that come with the Gertboard (six of them) and then run the jumpers you want over to the PI directly... that way, the GPIO port is free, and all 40 pins are at your disposal. You can see my pics here
edit: ... and another one here
donkshop wrote:Gertboard seems a good start.
Its an excellent place to start ! I am slightly embarrassed...
... I had my Gertboard for almost two years before I ever powered it up ! How dumb was that? I've had a blast plying with it... but more importantly its a great educational tool, and in the final analysis very useful in its own right too. I am doing some AVR programming with its on-board Atmel Atmega328P micro-processor! what a blast!