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Old 29th December 2007, 02:43 PM   #11
Eva is offline Eva  Spain
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PIC12 family is very easy and programming is less messy tan dealing with breadboards and analog electronics.
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Old 29th December 2007, 06:28 PM   #12
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Quote:
Originally posted by Eva
PIC12 family is very easy and programming is less messy tan dealing with breadboards and analog electronics.
Well, I found a datasheet for the PIC10, PIC12, & PIC16 Family chips, and from the looks of it, they only mention the PIC16 family for fan (and motor), PWM control. Despite the fact that they only mention the PIC16 for fan control, I get the feeling it has many more features than I need and that PIC10 or PIC12 will be a better choice since I have a very simple (at least in number of operations) device to create. Am I overlooking something?
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Old 30th December 2007, 05:43 PM   #13
Eva is offline Eva  Spain
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Some PIC16 devices and more complex ones have PWM in hardware that produces periodic timed pulses automatically while the CPU is free to do other tasks.

You can also do PWM with simpler PIC10 and PIC12 devices but the pulses have to be produced and timed in software (that is by your program). This is not so hard considering that instruction execution takes 1us (2us for jumps) on most PIC12 with internal oscillator, and that the only other thing that the micro has to do is to sense temperatures and calculate pulse widths accordingly.
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Old 30th December 2007, 07:04 PM   #14
Nordic is offline Nordic  South Africa
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Sorry if I read this wrong... but there are many low cost commercial controlers to do the job on the market... hardly think you can beat them form the price...
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Old 30th December 2007, 09:07 PM   #15
sfreak is offline sfreak  Australia
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Be worth your while checking out http://www.cpemma.co.uk/

Got a pretty simple PWM etc., and a few other bits and pieces.
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Old 31st December 2007, 12:45 PM   #16
AndrewT is offline AndrewT  Scotland
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did you find this one in that link?
http://www.cpemma.co.uk/pwm_erg.html

I like this one (Bells and Whistles version at the bottom) based on a dual comparator:
http://www.cpemma.co.uk/thermal.html

But as with all these stop/start controllers, one must run them from a dedicated PSU to help avoid interference getting into the audio and even then some may leak through.
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Old 1st January 2008, 09:01 PM   #17
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Have you tried a 555 timer PWM system with some power transistors?

Simple PWM Controller

http://www.cpemma.co.uk/pwm.html
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Old 1st January 2008, 09:20 PM   #18
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If nordic is thinking of the same ones I am then you may be overlooking some obvious choices.
There are a dozen sites/pages like the following if you ask google the right questions

http://www.sidewindercomputers.com/fancontrollers.html
http://www.acousticpc.com/fan_controllers.html

unless I've misunderstood your aim, this one looks like it would do what you need for twenty three bucks.
http://www.sidewindercomputers.com/seonecobllcd.html

Some of these are user controlled, some are temp controlled with leads and thermistors (like the linked one above). Unbelievably (in my humble opinion) there seem to be enough millions of people willing to hotrod their computers with liquid cooling and the like, and demanding this sort of thing, that the economies of scale have made it pretty tough to justify building your own controller. In other words, some of these are astonishingly inexpensive for what they do. Don't get me wrong. I don't see anything wrong with this. But if someone five years ago had offered me stock in a company catering this stuff I would have laughed. It's really suprising how big it's become.

There are many many "overclockers" forums on the web to get advice on this stuff too.
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