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3 wire vs 4 wire fan controller

post #1 of 31
Thread Starter 
Hello Forum,

Currently i'm getting some info for a project I will start soon...

This will consists of an lcd, similar to the g15 lcd but bigger, this will show the current status of the pc,
ex.. cpu temps, gpu temp, cpu freq, fan speeds and much more...

I was asking if is possible to control speed of a 3 wire fan?

If yes is this done by just controlling the supply voltage? or I need to vary the PFM (Pulse Frequency Modulation)??

Thanks
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post #2 of 31
yes i think it is possible remove the 3 wire molex and add 4 pin molex should be fine or even direct wiring to fan controller pins if that makes any sense
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post #3 of 31
Thread Starter 
Yes, apart of 3 to 4 pin connecter, my question was,
Is it possible with 3-wire fan Control the Speed and get the RPM speed reading?
Thanks
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post #4 of 31
Quote:
Originally Posted by Charlton22 View Post
Yes, apart of 3 to 4 pin connecter, my question was,
Is it possible with 3-wire fan Control the Speed and get the RPM speed reading?
Thanks
Yes, it is possible.

3-pin: the third pin is for RPM sensor. So, you can control the speed according to this sensor's reading.

4-pin: the fourth pin is for PWM (Pulse Width Modulation). This adds temperature into the monitoring.
post #5 of 31
If you are asking for tips to build a fan controller...

2 ways you can make them .. PWM (pulse width modulation) , Voltage control..


I would personally recommend voltage control because PWM although not being a pain in the butt to make ,at the end makes fan at low speeds noisy and makes them rattle..

now for 3 pin and 4 pin fans

3 pin fans can be controlled via voltage control and pwm too..although in 3pin fan the supply voltage itself has to be in pwm..

in 4 pin fans the voltage needs to be normal..but the 4th pin has to recieve pwm signal...


for your entire project I would recommend building something like this :
http://lcdsmartie.sourceforge.net/

and adding a fan controller circuit to it......



Quote:
Originally Posted by windfire View Post

4-pin: the fourth pin is for PWM (Pulse Width Modulation). This adds temperature into the monitoring.
4th pin is for input pwm signal..Its not for temprature...
3rd pin for output rpm signal...
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post #6 of 31
Thread Starter 
Quote:
Originally Posted by dragonxwas View Post
If you are asking for tips to build a fan controller...

2 ways you can make them .. PWM (pulse width modulation) , Voltage control..


I would personally recommend voltage control because PWM although not being a pain in the butt to make ,at the end makes fan at low speeds noisy and makes them rattle..

now for 3 pin and 4 pin fans

3 pin fans can be controlled via voltage control and pwm too..although in 3pin fan the supply voltage itself has to be in pwm..

in 4 pin fans the voltage needs to be normal..but the 4th pin has to recieve pwm signal...


for your entire project I would recommend building something like this :
http://lcdsmartie.sourceforge.net/

and adding a fan controller circuit to it......



4th pin is for input pwm signal..Its not for temprature...
3rd pin for output rpm signal...
Many thanks... +Rep

Therefore if I understood well,

1 -- Vcc with pulse with modulation
2 -- Tachometer
3 -- GND

Now what happens If I only connect the Tachometer wire to the motherboard, and give supply to the fans from the fan controller?

If this don't work, I also need to build the fan controller that reads tachometer pulses....
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post #7 of 31
^^

yes thats right for a 3pin fan...

if its a 4pin fan

red - VCC
black - ground
blue - tachometer
yellow - pwm in..

also if you just connect tachometer wire to motherboard and supply fans with power,that will work..

and yeah take this circuit diagram for fan controller I've been using reliably for years...takes max of 30watts..



lil messy but I know you could understand...
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post #8 of 31
Thread Starter 
Quote:
Originally Posted by dragonxwas View Post
^^

yes thats right for a 3pin fan...

if its a 4pin fan

red - VCC
black - ground
blue - tachometer
yellow - pwm in..

also if you just connect tachometer wire to motherboard and supply fans with power,that will work..

and yeah take this circuit diagram for fan controller I've been using reliably for years...takes max of 30watts..



lil messy but I know you could understand...
WOW!!!! +Rep again!

I found you post much interesting!

Your also getting the tacho reading from the Mobo? And controlling the supply from seperate circuit?

I was afraid that could mess up my sys....

Can I see your final result of your project?
Thanks

I just bought this fan --- http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=390200351984&ssPageNam e=ADME:X:RTQ:GB:1123#ht_2368wt_911"]http://cgi.ebay.co.uk/ws/eBayISAPI.d...#ht_2368wt_911[/URL]
to connect with my project
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post #9 of 31
Yep it does work...Im lazy posting pics but will be done b4 tomo...

btw..Its a good fan good static pressure for forcing air through heatsinks...after building this controller I think you can go for even more cheap fans from delta as they will be silenced

but dude you have started my tweakerbug again..now m gonna build a automatic fan controller using temps..
Edited by dragonxwas - 5/31/10 at 1:26am
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post #10 of 31
Thread Starter 
Quote:
Originally Posted by dragonxwas View Post
Yep it does work...Im lazy posting pics but will be done b4 tomo...

btw..Its a good fan good static pressure for forcing air through heatsinks...after building this controller I think you can go for even more cheap fans from delta as they will be silenced

but dude you have started my tweakerbug again..now m gonna build a automatic fan controller using temps..
Nice to hear that!!! Well I prefere manual setting for fans... (Until Now)

Are you good in programming?

I'm going to buy this 40 * 4 LCD Display http://cgi.ebay.co.uk/ws/eBayISAPI.d...m=220547647389

Do I need some LCD Driver Board to connect from the pc to this chip? Do you know any? I prefare using usb...

Thanks
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