《基于PIC16F877芯片的DS18B20测温系统设计》由会员分享，可在线阅读，更多相关《基于PIC16F877芯片的DS18B20测温系统设计（3页珍藏版）》请在金锄头文库上搜索。
1、 PIC16F877 DS18B20 d ! 9李永茂(常州机电职业技术学院电气工程系,江苏省常州市 213164)K null 1 :文中基于 PIC16F877芯片对 Dallas公司的单总线数字温度传感器 DS18B20的特性a工作原理及传输通讯协议进行了分析bDS18B20具有直接输出温度数字量,无需外接复杂的 A /D转换的特点,从而简化系统软a硬件的构造与实现b文中提出了一种基于 PIC16F877单片机与DS18B20的温度测量系统,分析了系统的硬件结构及软件设计b该温度测量系统具有结构简单a价格低廉a扩展方便和应用广泛等一系列优点b1 o M : PIC16F877; DS18
2、B20;数字温度传感器;单总线 m s | : TM938. 82收稿日期: 2010null05null17; 修回日期: 2010null06null10b0null 引null 言. d Z T E E . E | , A /D 3 | ) g ,P q , T bDSl8B20 A /D B 8 , 3 ,. ,V Z L L C , q e , g + 1 q b DS18B20 + # e Z E , N . PIC16F877 K l d b1null 单总线数字温度计DSl8B20介绍1. 1null DS18B20的特点DS18B20 . = q a ai % 9 g ? v
3、 b 1 / + : + L gZ T ;V Y V L , T Z T ; S - 55null 125null , 0. 5null ; 9 12 V I , | = Z T 1 b 3 . , N 1 ,F ? z , CRCn ? ,V L ,q ! 9 ? S b1. 2null DS18B20的工作原理DS18B20 . Y V q Y bDS18B20= b H |Y V 3 7 Y 7 $ : ,Y V 9 b9 $ - 55null B , T 9 - 9 , ,V U - 55null ,$ - 55null 7 i 9 F1null b$ 16 = T i bL V T
4、i % , ? i % 7 b2null 温度测量系统硬件设计2. 1null PIC16F877单片机PIC16F877 S Microchip 3 bPIC O ! 9 mE , W 9 L = | 9 L 7 9 L s ,i O z ,L L C T o . AT89C2051 e d ! 9 s J. C 0 / , 2008( 1): 121null123. 4 k , N l + , . DS18B20 _ J. 0 = , 2006, 32( 7): 1null3, 7. 5 Z . PIC L M. : t bt ? v , 2007: 45null55. 6 y . PIC
5、 ! 9 7 ? M. : t bt ? v , 2007: 62null69.null null 李永茂(1963null),男,高级工程师,主要从事电子技术应用及智能仪表方面研究bDesignofTemperatureMeasuringSystemofDS18B20BasedonPIC16F877LIYongmao( Changzhou Institute ofMechatronicTechnology, Changzhou 213164, China)Abstract:Based on PIC16F877, this paper analyzes the characteristics,
6、 principles and transaction senullquence of1nullwire digitaltemperature sensorDS18B20. DS18B20 shows the feature of directdigital temperatureoutputwithout complicatedA /D conversion, thus the hardwareand software of system canbe achieved easily.This paper presents the hardware and compile program de
7、sign of the temperature measure system based onPIC16F877 andDS18B20. This system has simple structure and low cos.t It also can be easily extended andhas bright application perspectives.Keywords: PIC16F877; DS18B20; digital temperature sensor; single bus(上接第 58页) null I null null D 1 WEISER M. The c
8、omputer for the twentynullfirst century J.ScientificAmerican, 1991, 265( 3): 94null104. 2 ; 祐, 史元春, 谢伟凯. 普适计算 J. 计算机学报,2003, 26( 9): 1042null1050. 3 SCOTT J. Locationnullaware computing and intelligent environnullments J. The IEE Sem inar on Intelligent Building Environnullments, 2005: 25null37. 4 A
9、BOWD G D, MYNATT E D. Charting past, present and funullture research in ubiquitous computing J. ACM Transactionson ComputernullHuman Interaction, 2000, 7( 1): 29null58. 5 9 , . a9 8 J. 9 S , 2003,30( 4): 18null22, 29.null null 李爱群(1969null),女,讲师,主要研究方向为计算机系统设计a计算机智能基础及应用和嵌入式系统及应用等bDesignofDistribute
10、dLocationnullawareComputingBasedonPervasiveComputingLIAiqun1, 2, ZHUANGYanyu1, WANGRuchuan1, 2(1. College ofComputer, NanjingUniversity ofPosts andTelecommunications, Nanjing 210003, China;2. Institute ofComputer, NanjingUniversity ofPosts andTelecommunications, Nanjing 210003, China)Abstract: In the pervasive computing environmen,t locationnullaware computing is a very important part ofcontextnullaware computing. This paper provides an design of the distributed locationnullaware computing whichbreaks away from the traditionaland fuss
