Years ago well before 911 we built a bunch of long term environment data loggers that were primarily designed to be dropped into the Canadian arctic and picked up a year later to have information read out. These data loggers were packaged in 3 inch plastic sewer pipe with an screw cap on one end and a domed end cap at the other. They were about a foot long.=20 One of them was sent to Peru to instrument a tree of national importance. A year or so later it was returned our customer and then to Byte Craft to have the data dumped out. We knew that it caused a stir on its return requiring diplomatic intervention (Think pipe bomb) The event driven software was started before it left and was still running when it was returned to us. One of the sensors was light levels. On the way down the case was opened for a few seconds and then closed. The return was more interesting. The case was opened for a few seconds and then closed for about 30 minutes. It was then opened for about an hour and a half with various light levels suggesting customs examiners at work. =20 =20 Regards, Walter.. -- Walter Banks Byte Craft Limited http://www.bytecraft.com --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .