Design of Digital Thermomer Based on SCM
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.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 º C ～ 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 AT89C52 MCU a temperature measurement
circuits， the circuits used DS18B20 high—precision temperature sensor, measuring
scope 0 º C～+100 º C， 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,
thefunctions and applications of AT89C52 .This circuit design innovative， powerful,
can be expansionary strong.
Keywords:Temperature measurementDS18B20AT89C52
