Robert, tanks for the suggestions! ( I haven't much familiarity with = electronics). This night I will do some tests on the breadboard (howev= er I "must" to stop the oscillators between the measure intervals, or the= logger batteries will be exausted a lot fastly! regards Marco=0D = ---------- Initial Header ----------- From : "pic microcontro= -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.