It's for air condition system. sorry for not mention it before.

Tal

-----Original Message-----
From: pic microcontroller discussion list [mailto:PICLIST@MITVMA.MIT.EDU]On
Behalf Of Josh Koffman
Sent: Thursday, January 23, 2003 4:02 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE]: protection circuit for cooling system


I'm guessing this is a computer cooling system. Many fans these days
come with a monitor output. Check to see if the fan has more than two
leads. If so, one of them is usually an output. I think it will output a
pulse every revolution, though I might be wrong about that.

Hope that helps,

Josh
--
A common mistake that people make when trying to design something
completely foolproof is to underestimate the ingenuity of complete
fools.
        -Douglas Adams


Tal wrote:
>
> Hi 2 All
>
> I need an idea for a friend for his cooling system.
> the problem is if the fan is stopped or stuck or have any malfunction, he
> want to cut the power to the system immediately.
> now, I though about measuring the fan wind or measure the fan current.
which
> method is the best way?
> do you have any simple idea or a cheap one?

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