I am going to be doing this unit next term. I've done most of the planning but am now thinking about the end when they make their alarm. I have some of the switches they could make and use (mostly push ones) but can't really figure out how this would work if it were a 'burlgar alarm' as someone would just pick the object up they were trying to get? Has anyone every done this/have any pics/or general ideas about how the finished alarm should be? Thanks for any help!