pc cooling fan rpm monitoring


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  1. #1
    Join Date
    Nov 2005
    Location
    Perth, Australia
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    Default pc cooling fan rpm monitoring

    does any1 know how the rpm monitoring pin works on pc cooling fans?

    I assume it will send a pulse either once per revolution or maybe 2 or 4 per revolution?

    i googled it but couldnt find info

  2. #2
    Join Date
    Nov 2005
    Location
    Perth, Australia
    Posts
    429

    Default

    found the info eventually after googling a while longer...

    for any1 who also wants to know, a pulse is generated twice per revolution, and its an open collector output so requires a 10k pull-up resistor for input to a PIC.

  3. #3
    Join Date
    Oct 2004
    Location
    Italy
    Posts
    695

    Wink

    Hi,

    Did you search for "cooling fan" on this forum?

    Luciano

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