目录
摘 要 ............................................................................................................................I
ABSTRACT ..................................................................................................................II
目录..............................................................................................................................III
第一章 引 言..............................................................................................................1
课题的背景和意义....................................................................................................................1
1.1.1 医疗输液监控系统设计的背景...............................................................................1
1.1.2 医疗输液监控系统设计的意义...............................................................................1
1.1.3 系统设计需要解决的关键问题..............................................................................2
第二章 系统方案设计与论证......................................................................................3
2.1 系统硬件结构总体设计方案...........................................................................................3
2.2 点滴速度测量电路方案的选择及论证...........................................................................3
2.3 液面检测电路方案的选择及论证...................................................................................4
2.4 通过电机控制滴速电路的方案论证.................................................................................5
2.4.1 电机控制滴速的方案设计.......................................................................................5
2.4.2 控制用电动机及驱动的选择与比较....................................................................6
2.5 显示器接口电路方案选择论证.......................................................................................7
2.6 键盘接口电路方案选择论证...........................................................................................7
2.6.1 独立式按键电路.......................................................................................................7
2.6.2 矩阵式键盘电路.......................................................................................................7
2.7 单片机型号的选择与论证...............................................................................................8
2.7.1 现有主流单片机的概述..........................................................................................8
2.7.2 单片机的选用..........................................................................................................8
2.7.3 单片机 I/O 口管脚分配 ........................................................................................12
第三章 输液系统各模块的硬件设计........................................................................13
3.1 控制电机模块设计..........................................................................................................14
3.1.1 步进电动机的工作原理........................................................................................14
3.1.2 步进电机控制原理................................................................................................14
3.2 数据采集模块及工作原理...............................................................................................16
3.3.1 红外发光二极管和光敏三极管............................................................................17
3.3.2 红外发光二极管主要参数....................................................................................17
3.3.3 光敏三极管的主要参数........................................................................................18
3.4 电源模块...........................................................................................................................19
3.5 声报警模块.......................................................................................................................19
3.6 复位电路...........................................................................................................................19
3.7 显示模块...........................................................................................................................20
3.7.1 LED 显示器的结构................................................................................................20
3.7.2 LED 显示器的显示方法........................................................................................22
3.7.3 7 段译码器 CD4511 .............................................................................................22
3.7.4 显示模块电路设计................................................................................................24
3.8 键控模块...........................................................................................................................24
第四章 系统软件及框图设计....................................................................................27
4.1 滴速检测子程序................................................................................................................29
