Quote Originally Posted by Charles1961 View Post
Good project! With I2C inetrface you can work with MAX6651 chip for control and monitoring the fan in linear voltage.See data sheet http://datasheets.maxim-ic.com/en/ds/MAX6650-MAX6651.pdf[/URL]
And for temp. you can use one like MAX6697 see datasheethttp://www.maxim-ic.com/quick_view2.cfm/qv_pk/4597
Thanks for the links. The temperature chip looks very interesting The control chip has one big problem: the output is linear this means the drive transistor could end up dissipating a lot of heat. Here's a nice link I found explaining heat dissipation in transistors, it's a description designed for people into water cooling

http://answers.yahoo.com/question/in...0120914AA8qraX

Quote Originally Posted by astrodanco View Post
Just make sure it works better than the Koolance TMS-200 + TMS-EB200. If you don't have one of those, get one, it's your competition. The main failings of Koolance's product are not enough fan headers (6), buggy non-open source software/firmware and non-user upgradable firmware. I'd recommend you don't go too hog wild on the cost.
How many fan headers would be enough? How many fan speeds need to be monitored?