基于单片机控制的DS18B20数字温度计设计_精品.doc

基于单片机控制的DS18B20数字温度计设计 DS18B20 digital thermometer design based on single chip microcomputer control AbstractThe temperature is a basic environmental parameters of peoples lives are closely related to the ambient temperature in industrial processes require real-time measurements of temperature is also inseparable from the temperature measurement in industrial production of temperature measurement and control of important significanceA microcontroller as the main control device temperature sensor DS18B20 is a new digital thermometer Including the design of hardware circuit design and system procedures Hardware circuit includes a main controller the temperature control circuit and display circuit the main controller using microcontroller AT89S52 is the temperature sensor DS18B20 DALLAS Semiconductor production the display circuit 8 common cathode LED digital tube The temperature control circuit temperature sensor and a preset temperature alarm circuit composed of an alarm signal when the actual measured temperature value is greater than the preset temperature value ie light emitting diode lights The system program including the main program the temperature subroutine and display routines The DS18B20 new single-bus digital temperature sensor DALLAS production of single-wire digital temperature sensor and set temperature measurement and A D converter in one and direct digital output with a simple interface high precision strong anti-jamming capability stable and reliable characteristics As a result of improved smart temperature sensor DS18B20 as detection devices compared with the traditional thermometer digital thermometer to reduce external hardware circuit with low cost and ease of use features DS18B20 thermometer at a high temperature alarm long-distance multi-point temperature control and other aspects of application development with good prospectsKeywords single-chip digital temperature sensor monitoring and control