Abstract
Abstract：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.
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 STC89C52 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 LCD 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 functions and applications of AT89C51 .This circuit design
innovative, powerful, can be expansionary strong.
Key words: Temperature measurement warning DS18B20 STC89C52
