The problem I am having is that the B+ model has more GPIO pins than previous models. I'm not sure of the exact number, I've not counted and I don't think it matters for my questions.
You can see that the A model (on the left) has less pins than the B+ model (on the right).
I have an addon board to do remote control plug sockets using RF. Here's the board:
The addon board has exactly the right number of pins for an A model pi so it's easy to put it on the correct pins. Not so much for the B+ model pi.
How can I tell which pins to put the addon board on?