The core of this paper is 80C552 single microcomputer, designed the computer control system of the electrothermal constant temperature box.
This system adopts integration the sensor of temperature AD590 to carry on examining and dealing with temperature signal. Make use of single microcomputer eight ten roads A/D transform of machine with compare gradually to collect signal. This system designed alarm faction of over limit, and use keyboard set temperature number, control the quantity of heat supply of the electric thermal thread and to make the temperature of the workshop stable at a certain established number. This system adapt clock chip MC146818 to show the time. It is supplying power depend on the storage battery carry on the function of clock working, and the data of its internal RAM, then power is be cut.
Keywords: single chip microcomputer; temperature sensor; the temperature control system
