[mythtv-users] Quiet fans

Tom Lichti tom at redpepperracing.com
Mon Oct 20 14:32:02 UTC 2008


Peter Loron wrote:
> On Oct 17, 2008, at 1:41 PM, Yan Seiner wrote:
>
>   
>> On Fri, October 17, 2008 1:10 pm, Peter Loron wrote:
>>
>>     
>>> Oh, yeah. I just checked my inventory, and I've got temp sensors from
>>> Dallas/Maxim. Analog, and ST Micro in the parts bin. Guess my only
>>> excuse for not doing it now is lack of time.  :-)
>>>
>>> Having the sensor on leads would be nice for checking the temp
>>> someplace the PCB won't fit. Should also be pretty easy to multiplex
>>> some sensors if you wanted multiple readings.
>>>       
>> You know, if you were to build a few of these, I'd buy a couple or  
>> three.
>> Basically, something that can handle 2-3 temp sensors, run up to 4  
>> fans,
>> and works off a regular PC power supply.
>>
>> That way you could stick the temp sensors inside the raid array and  
>> run
>> the fans based on the max temp in the array.
>>
>> (and a LCD showing the temp, usb interface, drivers... :-)  Just  
>> kidding
>> on those.)
>>     
>
> I've been tinkering with parts and spreadsheets. Looks like my cost  
> (in prototype quantities) for a unit that will programmatically  
> control 3 fans (via PWM), have 3 thermistors controlling them, and  
> have a 2x20 LCD screen, and USB connectivity would be around $26.
>
> A "dumb" controller with direct temp controlled PWM driven fan headers  
> and 3 thermistors would be around $13. No microcontroller, no USB, no  
> display.
>
> The fancy controller would have some kind of software that would allow  
> you to monitor the status of the fans, adjust the speed<-->temp ratio,  
> etc. The display would also have some programmability.
>
> Thoughts? How much would *YOU* pay?  :-)
>
> Basically if I can determine there is a market worth my time, I'll see  
> what I can do.
>   
I would be in for the fancy one, without a display, and would pay ~ $40, 
with software. I'd likely want two controllers.

Tom


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