Alan, Tilt switch... On Fri, 23 Sep 2005 14:40:33 -0700 (PDT), alan smith wrote: > probably thats what I mean, I just haven't found exactly what...so would a tilt switch operate if the unit was simply picked up or does it need to actually tilt Well it needs to experience a change in gravity that feels like tilting - either actual tilting or accelerating horizontally in the right direction would do it - but I can't think of anything (even an accelerometer) that would reliably indicate being picked up. But If you do it slowly enough, you could defeat almost any non-contact sensor. Have you considered just having a switch underneath, bearing on the surface it's resting on, so that it operates when lifted off it? Cheers, Howard Winter St.Albans, England -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist