Design of Digital Thermomer Based on SCM
Abstract
Along with national economy development, the people need to each heating
furnace 、 the heat-treatment furnace 、 in the reactor and the boiler the temperature
carry on the monitor and the control. Not only uses the monolithic integrated circuit to
come to them to control has the control to be convenient, simple and flexibility big
and so on merits, moreover may enhance large scale is accused the temperature
technical specification, thus can big enhance the product the quality and quantity.
In daily life and industrial production process, often used in the detection and
control of temperature, temperature is the production process and scientific
experiments in general and one of the important physical parameter. In the production
process, in order to efficiently carry out the production, to be its main parameters,
such as temperature, pressure, flow control, etc... Temperature control in the
production process of a large proportion. Temperature measurement is the basis of
temperature-controlled, more mature technology.Traditional thermocouple and
temperature components are the second resistor.The thermocouple and thermal
resistance are generally measured voltage, and then replaced by the corresponding
temperature, these methods are relatively complex, requiring a relatively large number
of external hardware support. We use a relatively simple way to measure.
We use the United States following DALLAS Semiconductor DS1820 improved
after the introduction of a smart temperature sensor DS18B20 as the detection element,
a temperature range of -55 ~ 125 º C, up to a maximum resolution of 0.0625 º C.
DS18B20 can be directly read out the temperature on the north side, and three-wire
system with single-chip connected to a decrease of the external hardware circuit, with
low-cost and easy use.
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 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：Temperatur measurement； DS18B20; AT89C51
