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3 Pin Fan

hi i am using a 12v power supply with my ez-b i started to get i little hot so i bought a 5v cooling fan for ez-b but my fan has 3 pin instead of 2 it has an extra signal wire does this make any diffrence i am thinking of connect fan to lets say d1 if i write set(d1,on) it should turn the fan on right?


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United Kingdom
Ignore the signal wire. Just connect red to vcc and black to ground.

Further information is here

why what happens if i connect it thanks for the response
United Kingdom
The third wire is the "Tacho" used in PCs so the motherboard can measure the speed of it. It generates 2 pulses per revolution so that the motherboard can "read" the RPM. It is not a control wire.
oh thanks then i will just connect black and red

Any way to read that pulse and use it with EZ-B? Output a tach reading?
United Kingdom
I was thinking that as I was typing what it's for. At the moment I have no idea and I don't have one to check either (unless an old PC has one still in it which I doubt). AFAIK it's just a 5v pulse (or whatever voltage is feeding the fan), but if the fan is spinning at 1,000rpm (admittedly that's fast for a fan) it means it will receive 33 pulses per second (if my maths done in my head is correct, it may not be), the EZB benchmark showed mine can only read/write 25 times a second.

It also makes me wonder why anyone would want this information.

FYI 4 pin fans have PWM control on the fourth wire if you wanted control over the speed.