Cheers UNM, thats something I hadn't thought about for a while. I did look into that lightly about a year ago I think. I'm going to build my self a KKTO, so once thats finished I'll revisit the Arduino mod for the Hottop. As an aside, I found what was wrong with my roaster last night. The chaff tray micro switch had a wire swinging free. This caused the roaster to automatically going into the 30 sec cool down mode, and may have caused it to do the auto eject thing as the beans were nearing first crack. Recrimped and soldered the offending wire so it should be good for another year now!