[完整版]基于CAN总线的温度检测系统毕业论文(2)

CAN bus full finishing the basic principles of temperature measurement systems, development method with the CAN-bus-related, a description of the components used in the introduction, and a CAN bus node design circuit design, design clock circuit and reset circuit.The final design of the CAN-bus temperature detection system software design and flow chart.

Temperature detection both in the field of medical electronics field or industrial control applications are very wide, people need all kinds of furnace, the reactor and boiler inspection and control, medical electronics and other biochemical analyzer, internalare related to temperature control,

目 录

引 言 ............................................................................................................................. - 1 - 第1章 绪 论 ................................................................................................................. - 2 -

1.1 本设计研究的背景和实际意义 ................................................................................................ - 2 -

1.2 研究相关内容的现状 ................................................................................................................ - 3 - 1.3 课题完成功能 ............................................................................................................................. - 3 -

第2章 系统设计的基本方案 ............................................................................................. - 5 -

2.1 设计的主要思路 ............................................................................................................................. - 5 - 2.2 温度检测的总体方案设计 ........................................................................................................... - 5 -

第3章 CAN总线温度检测系统的硬件及设计 .................................................................. - 6 -

3.1 CAN总线的介绍 ............................................................................................................................ - 6 - 3.2 AT89S51单片机介绍 .................................................................................................................... - 7 - 3.3 传感器的选用DS18B20传感器 ................................................................................................. - 11 - 3.4 收发器，控制器与光耦合器 ..................................................................................................... - 14 - 3.5 CAN总线接口电路设计 .............................................................................................................. - 17 - 3.6 单片机的接口电路 ..................................................................................................................... - 20 -

第4章 软件设计 ............................................................................................................. - 25 -

4.1 软件流程图 ................................................................................................................................. - 25 - 4.2 系统程序设计 ............................................................................................................................. - 29 - 4.2 实验结果分析 ............................................................................................................................. - 29 -

结论与展望 ......................................................................................................................... - 30 - 致 谢 ................................................................................................................................. - 32 - 参考文献 ............................................................................................................................. - 33 - 附录A原理图 .......................................................................................... 错误！未定义书签。 附录B一篇引用的外文文献及其译文 .................................................. 错误！未定义书签。 附录C 列入的主要参考文献的题录及摘要 .................................................................... - 36 - 附录D 实验的部分主要源程序 ........................................................................................ - 39 -

插图清单

图2-1 系统结构图 ............................................................................................................. 4 图3-1 AT89S51单片机引脚图 ......................................................................................... 6 图3-2 DS18B20外形结构图 ............................................................................................. 9 图3-3 DS18B20的写时序 ............................................................................................... 10 图3-4 DS18B20的读时序 ............................................................................................... 10 图3-5 PCA82C250收发器 .............................................................................................. 11 图3-6 CAN 总线系统硬件电路原理图 ......................................................................... 14 图3-7振荡电路 ................................................................................................................ 15 图3-8外部时钟的电路 .................................................................................................... 16 图3-9上电复位 ................................................................................................................ 16 图3-10开机复位 .............................................................................................................. 17 图3-11时钟电路 .............................................................................................................. 17 图3-12 DS18B20接口电路 ............................................................................................. 18 图4-1总流程图 ................................................................................................................ 19 图4-2 CAN SJA1000初始化 .......................................................................................... 20 图4-3 SJ1000发送 ........................................................................................................... 21 图4-4 SJA1000接受 ........................................................................................................ 22

表格清单

表3-1 DS18B20内部结构 ................................................................................................. 9 表3-2 SJA1000的功能框图 ............................................................ 错误！未定义书签。