Mark M. Hoffman wrote: > I skimmed through the blog entry and the earlier one which it references. > In your first attempt you reinvented the 'P' part of a PID control loop. > Don't give up! ;) There's a *ton* of info about PID controllers on the > web. If you're still interested, you could start here: > > http://en.wikipedia.org/wiki/PID_controller Very interesting stuff, thanks! My quick reading of this stuff indicates a possible problem. On my system at least, I can only read the temperature in whole degrees; lm-sensors returns a number in thousandths of a degree, but sadly the last three digits are always zero. This means that our differentiation of the temperature will be very crude, which could make it difficult to build a functioning PID controller. How can I find out the maximum safe operating temperature of my current CPU? Since my first priority is something that works on my current system, the only reason for me to pick this up again and explore in more detail is if I can afford to slow the fan even when the system is flat out, which means I need to know how fast I can run it. Thanks again! -- [][][] Paul Crowley [][] LShift Ltd [] [] www.lshift.net
