Comments on: Arduino temperature controlled PC Fan.

By: Floodo1

Floodo1 — Fri, 07 Nov 2008 08:10:22 +0000

the optocoupler is an elegant solution. you could use a transistor or some other non-isolated piece of silicon, but why? why not opt for the optocoupler and gain isolation?

By: Offlinesurfer

Offlinesurfer — Thu, 23 Oct 2008 00:13:58 +0000

Hi
Great article thanks, but is there a link to the code?
Thanks

By: Mr. Meval

Mr. Meval — Fri, 21 Dec 2007 02:38:19 +0000

A mosfet isn’t fully isolated I think. The CNY75 can take 600 volts between the diode side and the photo transistor side which is pretty good, there are ones rated higher. This is very good if you’re working with AC.

If the motor is a brushed DC motor I think you can run it with an SCR? I’ve not tried it yet but intend to.

By: Jason

Jason — Mon, 26 Nov 2007 23:06:55 +0000

Thank you for posting this on the net. I am building an external cooling fan unit for my new x-box 360 (notorious for overheating and dying). I plan on using the 5vdc output of the usb ports to turn the fans on and off with a 12vdc wall wart supplying the voltage for the fans. I was going to use a transistor and relay but a guy at work suggested an optocoupler instead so there are no transient spikes introduced into my x-box thru the usb port voltage. Your post was very helpful in designing my circuit. Thank you.

By: muzhair khan

muzhair khan — Tue, 06 Nov 2007 06:50:02 +0000

sir
i am a student of engineering in university of central punjab and i am designing a project to control different devices of motor by pc . i have write the program but it is not working please give me advice to what to do about this.

By: JennaSys

JennaSys — Thu, 25 Oct 2007 05:37:37 +0000

Thanks for posting this. I used it as a basis for my first try at using PWM on an atmega8.

By: Mime

Mime — Sat, 13 Oct 2007 17:46:44 +0000

Good answer! Could you use a MOSFET transistor in this circuit in place of the optocoupler? What are the advantages of each?

By: pK

pK — Thu, 27 Sep 2007 14:53:39 +0000

Because i whanted to show something about optocouplers

By: Mime

Mime — Thu, 27 Sep 2007 05:02:44 +0000

Why the optocoupler instead of a straight MOSFET transistor?

By: pK

pK — Mon, 24 Sep 2007 08:36:17 +0000

Hello folks!
Is nice to view my article here, also many thanks to dfowler for traducing quickly my bad english on the original article i have send to him

Just for the missing part of controlling FAN upon temperature:
I have not make this part because i whant people to get improve the basics on PWM and DC fan’s a do it yourself With that we can learn about managing diferent voltages on a same board and maybe do some variation of this king of circuit.

I hope you enjoy Arduino and PWM like me and see bricogeek dot com for more (in spanish)

See you very soon and thanks to dfowler another time for posting my article!

Regards,
Oscar G.