Abstract
Temperature control is a permanent topic.Historically, many aspects of hu
man life and temperature control is concerned, most especially to the water te
mperature control.Modern society, with the development of science and technol
ogy, the water temperature control is becoming more and more delicate.Becaus
e of this, collection of thistopic,Iselect the control object is the bathroomwatere
mperaturecontrol.Electric boiler is the device that convert electricity into heat, it has t
he advantages of simple structure, no pollution and has high automatically degree, wh
ich 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 syst
em, it is very difficult to use mathematical method to establish mathematical model an
d to control this system by using the classical control theory and method. Intelligent c
ontrol has produced something valuable in engineering practice, because it brings in t
he good things such as the experience, logical reasoning and memory from people.Thi
s paper finally chose a simple type control algorithm.At the same time, we choos
e the ATC89C51 SCM, and design the hardware circuit of temperature and water leve
l control of electric boiler, which includes the sensor circuit, the relay control circuit, t
emperature and water level display circuit, keyboard circuit, water level alarm circuit.
We choose DS18B20 temperature sensor and the electric contact water level sensor, c
ontrol circuit can control water level and temperature through the relay controlling sol
enoid valve and heater.The displaypartadoptsLCD. Based on hardware circuit, we wri
te C language program, and get more ideal control effect through C51 and debuggin
g.
Keyword: Temperature control ;AT89C51 SCM; DS18B20 ;LCD
