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From: email@example.com (Andrew VK3BFA)
Subject: Re: Rain sensor for a car windshield
Date: 22 Oct 2002 06:12:09 -0700
NNTP-Posting-Date: 22 Oct 2002 13:12:10 GMT
"Jeroen" wrote in message news:...
> "Alex" wrote in message
> > I am looking for a sensor that can be used on a windshield. That will
> > send informatin that I can interput and use to control the windshield
> > wipers for optimal visibility. This sensor would need to update at
> > least every second so I could determine if the wipers should move. If
> > possible the sensor should be able to determine the amount of rainfall
> > on the windshield within that time. I would like to know where I could
> > find such a sensor, how to build one, or an ideas on the subject. I
> > would appreciate any help you could give me.
> > Thank you,
> > Alex
> the usual system is an infrared transmitter and receiver. The transmitter
> sends IR light under an angle through the windschield which is then
> received. On the change of glass to air the light is reflected, and
> raindrops change the amount of light refected. Usually there 8
> transmitters/receiver arranged in a circle. This unit is placed in an area
> where the wipers wipe.
> Don't think it's easy to make it yourself. You can buy this off the shelf
> for around $150, it replaces the wiper intermittent relay.
here in Australia we do it by looking through the window - if its
raining we turn the wipers on!
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