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¹Ø¼ü´Ê£ºÎ¶ȿØÖÆ£»AT89C51µ¥Æ¬»ú£»DS18B20; LCD

Abstract

Temperature control is a permanent topic.Historically, many aspects of human life and temperature control is concerned, most especially to the water temperature control.Modern society, with the development of science and technology, the water temperature control is becoming more and more delicate.Because of this, collection of thistopic,Iselect the control object is the bathroomwateremperaturecontrol.Electric boiler is the device that convert electricity into heat, it has the advantages of simple structure, no pollution and has high automatically degree, which has become the main equipment for heating. For the electric boiler, because it is a nonlinear, time-varying, long time-delayed, large inertia and unidirectional rising system, it is very difficult to use mathematical method to establish mathematical model and to control this system by using the classical control theory and method. Intelligent control has produced something valuable in engineering practice, because it brings in the good things such as the experience, logical reasoning and memory from people.This paper finally chose a simple type control algorithm.At the same time, we choose the ATC89C51 SCM, and design the hardware circuit of temperature and water level control of electric boiler, which includes the sensor circuit, the relay control circuit, temperature and water level display circuit, keyboard circuit, water level alarm circuit. We choose DS18B20 temperature sensor and the electric contact water level sensor, control circuit can control water level and temperature through the relay controlling solenoid valve and heater.The displaypartadoptsLCD. Based on hardware circuit, we write C language program, and get more ideal control effect through C51 and debugging.

Keyword: Temperature control ;AT89C51 SCM; DS18B20 ;LCD

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