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!!

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-

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.

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.

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!

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

Ween

Platinum - Posts: 1,368

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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