Rain or water sensor?

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wester97

Member - Posts: 32

Joined: November 19, 2005

Location: United States

Posted: November 19, 2005 at 11:39 PM / IP Logged

Anyone know of a water sensor that I could use so that i dont end up leaving my windows cracked and have a freak storm soak my car again?

Obviously going to be used with a window module and timer ....

Thanks!!

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dualsport

Silver - Posts: 983

Joined: September 27, 2005

Location: United States

Posted: November 20, 2005 at 1:19 PM / IP Logged

Sounds interesting-

There's probably a commercial one out there, but something like this should work, if you can't find it and want to try making it yourself from a few cheap components-

Rain or water sensor? - Last Post -- posted image.

Component List >>>

1uF cap

1N4001 diode

RELAY

BS170

10M, 1M, 330 ohm resistors

14011 CMOS NAND gate

Maybe use a pair of header pins for the contacts, which you would put in a shallow tray that would collect the rain water- the idea is that when the water touches both pins, it'll conduct and short the two together, triggering the circuit and briefly closing the relay.

It outputs a single pulse, and won't repeat until the contacts dry out and open the circuit again.

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dualsport

Silver - Posts: 983

Joined: September 27, 2005

Location: United States

Posted: November 20, 2005 at 1:23 PM / IP Logged

By the way, if your trigger input doesn't really require any current drive, you could probably delete the BS170 and relay shown, to cut down on the parts count.

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wester97

Member - Posts: 32

Joined: November 19, 2005

Location: United States

Posted: November 20, 2005 at 5:07 PM / IP Logged

Wow. Really makes me wish I was an EE!

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dualsport

Silver - Posts: 983

Joined: September 27, 2005

Location: United States

Posted: November 20, 2005 at 9:17 PM / IP Logged

Sure enough, a google search shows something tailor made for the purpose: rainmain

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Ween

Platinum - Posts: 1,366

Joined: August 01, 2004

Location: Illinois, United States

Posted: November 20, 2005 at 9:50 PM / IP Logged

hi,

if i recall correctly, Micro-sciences/Twindows had an add on piece to their sunroof

controller modules that performed a rain sense(auto-close) and temperature sense(auto-vent).

the rain sensor portion was a circuit board (gold plated for corrosion protection) that was installed

near the windshield. also i'm pretty sure i could trigger the auto-close input of their window modules

using the above circuit board directly connected to that particular input.

more input for you.

mark

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Rain or water sensor?

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