This topic designed one kind to have many measuring point intelligence temperature survey control application systems. This system takes the temperature sensor using performance price quite good thermal resistance Pt100, takes the signal using the constant current electric circuit the gain electric circuit, into the enhancement survey's resolution, in the latter level's amplifying circuit used has been possible the program control bias voltage, the signal transformation to use the serial interface 12 A/D switch TLC2543, instrument's CPU uses present low end but technology mature very AT89S51, instrument's LED nixietube demonstrated that/the actuation chip used the connection to be simple, but the function formidable CPLD electric circuit, simultaneously the system also has designed the RS-232 main line's communication interface circuit. The Pt100 foreign wiring selects 4 system methods to reduce the error, uses the multi-channel analog switch's cut to 64 group temperature difference signal by to save the cost; The temperature examination used the digital filtering algorithm to enhance the resistance to interference. In this article to overcome the algorithm adaptiveness weak shortcoming, the union fuzzy theory has studied one kind based on the fuzzy reasoning adaptive control algorithm. In high accuracy control domain time-dependent system's control precision request, the fuzzy control by its robustness strong and to the parameter variation insensitive and so on merits already has the widespread application in many domains. Has the structure by this topic constitution's multi-channel temperature system to be simple, the low in price, the measuring accuracy is high, measuring range wide and so on characteristics, has certain usability and the high society promotes the value.
Key words: temperature sensor，Multi-channel temperatures， fuzzy control
