基于DS18B20的数字温度计设计

his paper introduces a kind of digital thermometer based on DS18B20, this design uses AT89C51 microcontroller as control core, can set the upper and lower limit of temperature alarm. This paper introduces the characteristics of the temperature sensor DS18B20, gives the software and hardware design scheme of the system, and part of program flow chart of the software design is presented. In this design, the field temperature is directly send by "single bus", improved the immunity of the system in bad environment, suit for the temperature measurement. When measuring field temperature cannot provide DC power supply, DS18B20 can use parasitic power supply.