汽车尾灯控制电路(课程设计报告)

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1、目录摘要·····················································1一、设计任务··············································2二、实验目的··············································2三、总体设计方案·········································23.1设计思路···········································23.2设计

2、原理···········································3四、电路组成·············································3954.1模式控制电路·······································34.2时钟信号源········································44.3驱动电路与显示电路································4五、硬件电路安装、调试················

3、···················65.1遇到的主要问题·····································65.2现象记录与原理分析·································65.3解决措施及效果·····································6六、仿真结果···················95··························6七、实验总结与体会·······································9八、参考文

4、献·············································9九、附录·················································9摘要随着经济的发展，汽车越来越被人们所需要，而由此也引发了一系列问题。比如，因为汽车突然转向所引发的车祸经常出现。如果汽车转弯可以通过尾灯的状态变化来确定，就可以提示司机、行人朋友们车子正在转弯，一定程度的避免车祸的发生。因此，本方案设计了一个“汽车尾灯控制电路”。“汽车尾灯控制电路”作为电子技术基础课程的一个实践，利用基本的芯片：双向

5、移位寄存器74LS194，二输入与非门74LS00、555定时器及电阻、电容进行搭建。综合数字电路和模拟电路的知识，提升了我们处理实际问题的能力，有助于增强我们将理论转为实际的意识，是一种很好的锻炼和学习方式。【关键词】：汽车尾灯控制电路；74LS194；74LS00；555定时器。95一、设计任务设计一个汽车尾灯控制电路，要求汽车尾部左右两侧各有3个指示灯(用发光二极管模拟)，当在汽车正常运行时指示灯全灭；在右转弯时，右侧3个指示灯按右循环顺序点亮；在左转弯时，左侧3个指示灯按左循环顺序点亮；在临时刹车时，所有指示灯同时点亮。二、实

6、验目的1、锻炼学生综合运用电子技术基础知识以及动手能力；2、提高学生使用中规模集成芯片以及调试较大型电子系统的能力；3、使学生了解基本逻辑单元电路在实际生活中的应用，为今后进行复杂的综合型电子系统的设计和调试打下基础。三、总体设计方案3.1设计思路95分析以上设计任务，由于汽车左转弯或右转弯时，3个指示灯循环点亮，所以用双向移位寄存器74LS194顺序输出高电平，从而控制尾灯按要求点亮。由此得出在每种运行状态下，各指示灯与给定条件间的关系，即逻辑功能表1-1所示。汽车尾灯控制电路设计总体框图如表1-1所示。表1-1汽车尾灯和汽车运行状

7、态开关控制汽车运行状态右转尾灯左转尾灯S1S2D1D2D3D4D5D600正常运行灯灭灯灭01右转弯按D1D2D3顺序循环点亮灯灭10左转弯灯灭按D4D5D6顺序循环点亮11临时刹车所有尾灯同时点亮3.2电路设计原理触发信号驱动电路(74LS00、71LS194）左显示函数控制电路（开关）右显示函数图3.2.1汽车尾灯控制电路设计总体框图95图3.2.2汽车尾灯控制电路原理图四、电路组成4.1模式控制电路控制驱动电路的工作模式。图4.1模式控制电路4.2时钟信号源时钟信号源是由555定时器组成的多谐振荡器，振荡周期为T=0.7(R1+

8、2R2)C。时钟信号源如图4.2所示：95图4.2时钟信号源4.3驱动电路与显示电路（1）S1=0，S2=0时，U1：～CLR=0(S1=0，S0=0)，清零功能，QA=0、QB=0、QC=0、QD=0（此时～CLR=0