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measuring fan rpm's
- Thread starter wagex
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OP
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- Jan 14, 2011
- Thread Starter
- #3
it would if i could plug the fan into a motherboard, i suppose i could just make an extended wire to a motherboard on the other side of the room lol, that will be a last resort though
Programs read fan speed off the motherboard (unless that software came with hardware to plug fans in to...).
A fan controller is your best bet IMO. They all cost dollars. But I think for like $40 you can get a nice Lamptron that does that...some are cheaper too.
A fan controller is your best bet IMO. They all cost dollars. But I think for like $40 you can get a nice Lamptron that does that...some are cheaper too.
OP
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- Jan 14, 2011
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- #6
i suppose il just have to go that route argh lol i need to monitor between 1-4 ultra kazes i just bought so a 4 channel laptron should do
p.s. they(ultrakazes) are only 5 bucks with shopp runner free shipping btw heads up
just wish this rig would be complete already lol its alot more work and dollhairs than i anticipated but it should be worth it
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- Aug 19, 2012
http://www.filehippo.com/download_speedfan/ I do not want money only to help a friend you could use it with the program i said before it is up to you? Just look at the post for the program and think about it got to go out back in 10 mins.
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Arduino + RPM Reading code + LCD Display = Custom RPM readout without using the MoBo. It costs some $, but I like DIY stuff better than "bought" units.
It costs some $, but I like DIY stuff better than "bought" units.
OP
- Joined
- Jan 14, 2011
- Thread Starter
- #11
i would do that if it was going inside a computer, but sadly it aint, but thank you again
Buy "cheap" digital multi meter that has a frequency measurement, then hook the fan's rpm like this below schematic. Again, I said cheap, no need for those expensive DMM.
To get the rpm, just multiply the frequency reading by 30.
Ther resistor can be any value above 1K and below 10K Ohm.
PS : Ignore the 2nd pic that with the small box "PWM Fan Controller" if its confusing you, or just see it as the mobo with the pwm line.
Video from the giant PWM controller thread, an example from my dmm, that orange thingy with the frequency reading used as rpm reader.
To get the rpm, just multiply the frequency reading by 30.
Ther resistor can be any value above 1K and below 10K Ohm.
PS : Ignore the 2nd pic that with the small box "PWM Fan Controller" if its confusing you, or just see it as the mobo with the pwm line.
Video from the giant PWM controller thread, an example from my dmm, that orange thingy with the frequency reading used as rpm reader.
Edit : Just to simplify thing, the answer is yes.
Simple explanation :
Fan rotation is measured in RPM, stands for Revolution(Round) Per Minute.
While frequency is measured at how many period (pulse) in one second.
See the difference ?
Say a fan is running at 1200 RPM.
= 1200 rotations / minute
= 1200 rotations / 60 seconds
= 20 rotations / second
= 1200 rotations / 60 seconds
= 20 rotations / second
So in one second that rpm wire generates :
20 rotations/sec X 2 pulses = 40 pulses/sec = 40 Hz = as in the frequency meter reading.
Converting back from frequency reading at the meter to RPM (Rev Per MINUTE) is easy using this simple formula :
(Frequency Reading Result) X 60 Seconds / (2 Pulses per rotation)
Hence -> (Frequency Reading Result) X 30 equal to the fan's RPM.
Hope this helps.
Last edited:
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We use stuff like this in the Radio Control world to monitor Propeller Speed...
I'd think it'd work on a fan as well...
This one is good for 2 to 9 blades...
http://www.ebay.com/itm/Brand-new-T...Control_Parts_Accessories&hash=item4d02597bba
I'd think it'd work on a fan as well...
This one is good for 2 to 9 blades...
http://www.ebay.com/itm/Brand-new-T...Control_Parts_Accessories&hash=item4d02597bba
OP
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- Jan 14, 2011
- Thread Starter
- #18
i like that convicted1! il look into that, but i think im going to go with the scythe kaze controller with the lcd output or the lamptron
and i dont think my multi meter has a hz setting il check when i get home from work
and i dont think my multi meter has a hz setting il check when i get home from work
OP
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- Jan 14, 2011
- Thread Starter
- #20
thanks, but the computer would be on the other side of the room, and i want to be able to take pics of all my instruments at the same time (psi, gpm, temps, d/t, fan speed[or fan voltage]). i think im just going to plug them into a motherboard header and adjust the voltage on them and check speeds at what volts do the fans spin, and just use that as the base, or once i get some dollars im gonna get a fan controller with rpm readouts. getting ever closer should have my new fans in today some 38mmx120mm 3k rpm beasts
i think im gonna just start a thread for getting this testing rig setup lol
also should be making the frame to hold all the stuffs soon like
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