Deciding on connectors between the PCBs and off-board components was more difficult than I expected. There are dozens of systems for connections and I wasn’t familiar with most of them. I ended up buying a grab bag of connectors (for only $7.95) at Jameco – the process of digging through and sorting 200 random pieces got me familiar with different features and sizes.
I finally spec’d what I wanted: .1″ pin spacing (compatible with breadboards), a locking connection (so it wouldn’t come loose during travel), and a variety of numbers of pins. I settled on the Molex KK 254 system.
