This article introduces the function, structure and principle of temperature measurement of digital temperature sensor and its application in multipoint temperature measurement system . With its high accuracity and good exchangeable character , the temperature data can be coded , and transmitted through one-bus wire , so communication becomes more convenient and long distance transmission without interruption . The system can be simplified and expanded , facility maintenance. This design is a touring temperature measurement system based on DS18B20 and AT89C2051 . AT89C2051 is a single-chip microcomputer with a small Flash ROM whose size is small and price is cheap ,with DIP20. This system is developed by C programe language which has many features of high language such as the assembler language , its storehouse of function is abundant , fast operation and high efficiency to compile , have good planted abilities , and it can realize the direct control on hardware of system . This design completes the function of interuption control of DS18B20 and caculation of measurement temperature . Display programe achieve the act of touring measurement and display of the value of temperature in every point , and allow correct of the error through interuption programme to realize the correction of the sensor according to the calibration of the temperature .
This system has powerful practicability and high dependability.
Key word： Digital sensor； AT89C2051； DS18B20； Temperature；
Data acquisition
