外文原文：
Design of the Temperature Control System Based on AT89C51
ABSTRACT
The principle and functions of the temperature control system based on micro contro
ller AT89C51 are studied, and the temperature measurement unit consists of the 1-Wi
re bus digital temperature sensor DS18B20. The system can be expected to detect the
preset temperature, display time and save monitoring data. An alarm will be given by
system if the temperature exceeds the upper and lower limit value of the temperature
which can be set discretionarily and then automatic control is achieved, thus the temp
erature is achieved monitoring intelligently within a certain range. Basing on principle
of the system, it is easy to make a variety of other non-linear control systems so long
as the software design is reasonably changed. The system has been proved to be accur
ate, reliable and satisfied through field practice.
KEYWORDS: AT89C51; micro controller; DS18B20; temperature 1 IN
TRODUCTION
Temperature is a very important parameter in human life. In the modern society, tem
perature control (TC) is not only used in industrial production, but also widely used in
other fields. With the improvement of the life quality, we can find the TC appliance i
n hotels, factories and home as well. And the trend that TC will better serve the whole
society, so it is of great significance to measure and control the temperature. Based o
n the AT89C51 and temperature sensor DS18B20, this system controls the condition t
emperature intelligently. The temperature can be set discretionarily within a certain ra
nge. The system can show the time on LCD, and save monitoring data; and automatic
ally control the temperature when the condition temperature exceeds the upper and lo
wer limit value. By doing so it is to keep the temperature unchanged. The system is of
high anti-jamming, high control precision and flexible design; it also fits the rugged e
nvironment. It is mainly used in people's life to improve the quality of the work and li
fe. It is also versatile, so that it can be convenient to extend the use of the system. So t
he design is of profound importance. The general design, hardware design and softwar
e design of the system are covered.
1.1 Introduction
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