Taking it to the next level: This is my travelling demo unit I am working on. I added a Pi driven touch screen to the mix to allow for operator interaction with mysql in the onion via the onion AP, access control granted via a nifty little serial fingerprint scanner (can run on either pi or onion), barcode scanner and a little "closed loop machine demo" which contains 2 servo's and a microswitch that I still need to complete. It's come a long way since the veroboard prototype days!