ON 20040824@9:37:57 AM at page:
http://www.piclist.com/techref/io/sensor/pos/opticalranging.htm#38223.4013541667
James Newton[JMN-EFP-786] archive reference
http://www.piclist.org/techref/postbot.asp?by=time&id=piclist/2004/08/21/045410a
PICList post "<I>Suggestion - Range finding over short distances</I>"