How about a microswitch under each thing? When you lift the item it triggers a PIC? Or, RFID could work nicely...would require tagging all the inventory though. If everything had a different weight, you could measure the change. Just some off wall ideas :) Josh -- A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. -Douglas Adams Pedro Drummond wrote: > Most recent challenge is to automatically detect items taken from minibar > refrigerators (as in hotel rooms). Any sensor ideas ? -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu