View Full Version : pc cooling fan rpm monitoring
Kamikaze47
- 5th December 2005, 22:19
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
Kamikaze47
- 5th December 2005, 22:58
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.
Luciano
- 5th December 2005, 23:08
Hi,
Did you search for "cooling fan" on this forum?
Luciano
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