2.4.1 L298 引脚与功能说明
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.............................................................................7
3 系统方案设计与论证...............................................................................7
3.1 方案一..........................................................................................7
3.2 方案二..........................................................................................8
3.3 方案选择.......................................................................................8
4 系统硬件设计.........................................................................................8
4.1 系统硬件框图................................................................................8
4.2 转速信号采集电路..........................................................................8
4.3 单片机模块....................................................................................9
4.4 电机驱动与控制电路.....................................................................10
4.5 显示电路模块..............................................................................11
4.5.1 液晶显示器 LCD1602 芯片引脚图与说明...............................................11
4.5.2 液晶显示模块电路....................................................................................12
5 PCB 设计.............................................................................................12
5.1 Protel 99 SE 简介.......................................................................12
5.2 印制电路板设计...........................................................................12
6 系统软件设计.......................................................................................12
6.1 主程序流程图..............................................................................13
6.2 转速计算程序流程图.....................................................................14
6.3 占空比可调 PWM 波产生程序.........................................................14
6.4 显示程序流程图...........................................................................15
7 试验数据采集与结果分析.......................................................................15
7.1 系统硬件调试..............................................................................16
7.1.1 直流电机驱动与控制电路模块调试........................................................16
7.2 系统软件调试..............................................................................16
7.2.1 转速测量与显示仿真调试........................................................................16
7.3 系统硬件与软件统调.....................................................................17
7.3.1 测试方法....................................................................................................17
7.3.2 测试结果....................................................................................................18
7.3.3 结论与误差分析........................................................................................20
8 结束语................................................................................................20
参考文献:.............................................................................................21
附录:...................................................................................................22
附录 1 PCB 图...................................................................................22
附录 2 原理图....................................................................................23
附录 3 实物图....................................................................................24
附录 4 元器件清单..............................................................................25
附录 5 源程序....................................................................................26
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