Motion Sensor W/timer - Electrical - DIY Chatroom Home Improvement Forum

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Old 12-19-2008, 08:02 PM   #1
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motion sensor w/timer

I am looking for a device that will sense motion and, after a set time(maybe a couple of minutes), turn on a fan for a programmed amount of time. Maybe run for 5 minutes.

I am remodeling and will set the cat box under a counter top. There will be a duct to a fan, or a fan that is ducted, out the wall. When kitty gets in to do his business the timer will start and the fan will exhaust the stinky poo smell(that is tech jargon). I don't want to run the fan immediately because it may scare the cat. I have looked for Greenheck fans and controls but can't find what I want.

Any comments(other than getting rid of the cat : ) ) or ideas are appreciated.


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Old 12-19-2008, 08:22 PM   #2
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Originally Posted by 7echo View Post
sense motion
which triggers a monostable multivibrator
after a set time(maybe a couple of minutes),
which triggers another one
turn on a fan for. . .Maybe run for 5 minutes.
A 556 IC
and a relay should do it.

If you can solder, these guys can help with the details

and parts are available from


Yoyizit is offline   Reply With Quote
Old 12-19-2008, 08:32 PM   #3
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Some of these sensors and timers may give you some ideas.
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