----- Original Message ----- From: "Olin Lathrop" To: "Microcontroller discussion list - Public." Sent: Saturday, February 21, 2009 10:23 AM Subject: Re: [EE]analog or digital? --PID temperature control > gardenyu wrote: >> I started looking at temperature control inside a thermal chamber. >> That tank is actually a first-order system with some possible >> disturbances from different input and ambient temperatures. Also a >> temperature sensor can be considered to have a linear, very small >> time constant (or: high bandwidth). Thus, the system should be stable >> by its nature. Olin responded: > I'm not sure what your point is here since you're not asking anything. Do > you think you've discovered something new and are trying to educate us, or > are you just trying to show off something you think you know? > Olin, The OP DID ask something and you, in your own inimitable fashion, answered it. The question was a few paragraphs away (also in the Subject, which you have often made clear you don't pay any attention to). Are you now suggesting that the question not only must be in the text of the post, but also must be in the first paragraph? Nearly everything else in the original post seemed to be background info about the system, and basic PID info (as the OP understood the material) to give potential repliers a baseline. I certainly didn't read into his post that he considered himself an expert in the subject matter nor as showing off some new-found knowledge. We have enough folks here who do that, so the competition would be pretty stiff. >> I wonder which way might be more appropriate? Richard > ******************************************************************** > Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products > (978) 742-9014. Gold level PIC consultants since 2000. > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist