Fan RPM monitor wire and signal...how can I fake it?

omaticrail · Oct 23, 2003

Basically I want to construct a liquid flow monitoring device, and feed the output to a fan RPM monitor. I can't find one, so I thought I'd build one, but I don't know what the fan monitor signal looks like (no osciloscope).

Since87 · Oct 23, 2003

It's just an open collector output, pulsed at a rate that is (usually) twice the RPM.

Sonny · Oct 23, 2003

Look for the GF3 Projoect HERE, BLADERUNNER made exactly what you need as part of the project.

omaticrail · Oct 23, 2003

Sonny, cool site and thanks for the link. However, I never found the information.

Can ya link me a wee bit closer?

Sonny · Oct 23, 2003

BLADERUNNER PAGE #5

Removing the fans created another problem as the above app would keep popping up to inform me the fan was dead, and there was no way to disable the fan monitoring. With the help of the members on Hardware Central Forums I made a small simple circuit for less than £2 that mimics the fans pulses. I named this the pulse gen and its build is fully explained HERE.

Bad news is that his link is not working properly, you will have to search the "other" board to find it. Bladerunner is also a member here so you may be able to send him a PM.

Fan RPM monitor wire and signal...how can I fake it?

omaticrail

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Since87

Member

Sonny

Senior TIFOSI

omaticrail

Member

Sonny

Senior TIFOSI

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