Design of Digital Thermomer Based on SCM
ABSTRACT
Controlled by single-chip microcomputer to control not only to them, advantages of
simplicity and flexibility, and can significantly increase the temperature specifications, which
can significantly increase the quality and quantity of the products. In the process of production,
in order to efficiently produce, it must be the main parameters, such as temperature, pressure,
flow, and other effective control. Traditional temperature measuring component thermocouple
and resistance. Are generally voltage of thermocouple and thermal resistance measured, then
converted to the corresponding temperature, these methods are relatively complex and requires
more external hardware support. We are in a relatively simple way to measure.-55~125 º c
temperature range, maximum resolution up to 0.0625 ºc. DS18B20 can read temperature value,
and wire connected to the microcontroller, reduced external hardware circuits, low cost and ease
of use features.
The introduction of a cost-based AT89C51 MCU a temperatur measurement circuits, the
circuits used DS18B20 high-precision temperatur sensor, measuring scope 0℃-～+100℃,can set
the warning limitation, the use of Seven digital tube seven segments LED that can be display the
current temperature. The paper focuses on providing a software and hardware system
components circuit, introduced the theory of DS18B20, the founctions and applications of
AT89C51 .This circuit design innovative, powerful, can be expansionary strong.
Keywords：Temperature measurement ；DS18B20 ；AT89C51
