Looks like the question might be "How do I tell how well the wipers are keeping the windshield clear?" This could require a device looking through the windshield. A simple IR system used for remote controls, with the transmitter just outputting pulses and the receiver detecting the lack of pulses might work if the rain on the windshield would scatter the IR enuff. I will test this theory first rain I get. Can strap my BoomBox on the hood and see how well the remote control works in the rain. And will start looking for a IR transmitting hood ornament. Bill ----- Original Message ----- From: "cdb" To: Sent: Monday, November 04, 2002 1:09 PM Subject: Re: [EE]:rain Sensors, was Infra-red Opto help snip Mind you I could perhaps have it as an arm in the timing chain of a 555 hmm Colin -- cdb, bodgy1@optusnet.com.au on 04/11/2002 -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics