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
Printable View
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
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.
Hi,
Did you search for "cooling fan" on this forum?
Luciano