Why a Raspberry Pi B+? For starters, that’s what I had lying around I ordered one for testing, and later decided to use it for this project. The project can be done on an A(+) or B model, but as the A(+) only has one USB port, you probably end up using expensive breakout boards and doing a lot of wiring. I plan to do as little as possible wiring, so the four USB ports on the B+ come in handy. Here in Holland, the prices for the four versions don’t differ that much, all versions are available just under € 30, so it makes sense to just go for the B+.