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1、 毕业设计（论文）题 目：基于单片机的胎压测试系统的设计与实现摘 要本文完成了胎压测试系统的设计与实现。实现了测试汽车轮胎压力的功能，由三种不同的计量单位通过 LCD 显示给用户，如果超出预设阈值就会发出警报提醒司机安全行驶。另外，在正常状态下可实时显示日期和时间，有断电保护功能，并可对日期和时间进行设置。首先硬件采用气压传感器 MPX4105、STC5A60S2 单片机、DS1302 时钟电路和1602LCD 等。通过气压传感器 MPX4105 获取与汽车胎压相对的模拟电压值，经过 V/F变换输入到单片机进行处理，最终由通过 LCD 显示电路显示相应气压值。另外，DS1302 时钟电路与单片
2、机连接实现了 LCD 显示日期和时间，并可断电保护的功能。其次采用 C 语言作为开发工具软件，在 Keil C 环境下进行了对单片机各个端口以及定时器工作方式和串行口工作方式进行设置，并对定时器和串行口进行初始化用以实现对单片机和各个功能模块芯片之间通讯和联络的设定，以及分配地址空间交代程序中各个变量等的设计和编码。最后完成系统的可靠性、稳定性等性能的测试。压力超出阈值会自动报警提醒驾驶员安全行驶。不工作状态下，可显示日期与时间并有断电保护功能。具有可携带、测试操作方便、价格低廉等优点。关键词：气压传感器；胎压；单片机AbstractThis paper completed a tire pr
3、essure measurement system. It realizes the function of the test tire pressure. It from three different units of measurement through the LCD display to the user, if you exceed a preset threshold alerts will remind drivers to drive safely. In addition, in the normal state it can be real-time display d
4、ate and time. There is power failure protection and on the date and time settings.First of all, hardware used pressure sensor MPX4105, STC5A60S2 single chip, DS1302 clock circuit, 1602LCD and so on. The pressure sensor MPX4105 and automotive tire pressure relative to the analog voltage value, after
5、the V / F transform the input to the microcontroller for processing, and ultimately by the circuit through the LCD display shows the corresponding pressure values. Besides, DS1302 clock circuit and microcontroller connection to display the date and time and power protection. Secondly, as a developme
6、nt tool with C language software, Keil C environment for all ports of microcontroller and timer mode set the serial port work, it initializes the timer and serial port to achieve each function module chip microcontroller, it explains the program address space allocation of the variables such as the
7、design and coding. Finally, to complete the system reliability, accomplished stability and other properties of the test. Pressure above the threshold will automatically alarm to remind the driver drive safely. When it does not work, it can display the date and a power-off protection. The merits are
8、portable, easy to operate, low price and so on.Keywords: pressure sensor; tire pressure; MCU 目 录绪 论.11 系统的总体设计.51.1 总体设计思路.51.2 硬件设计部分.51.2.1 A/D 转换.61.2.2 数据处理.61.2.3 气压传感器的选择.61.2.4 三端稳压器的选择.71.3 软件设计部分.72 系统的硬件设计.92.1 硬件设计思路.92.2 单片机外围电路.92.2.1 复位电路.92.2.2 振荡电路.102.3 电源部分.112.4 按键部分.112.5 显示部分.132.6 报警电路部分.132.7 元件简介.142.7.1 单片机 STC5A60S2 简介.142.7.2 气压传感器 MPX4105 简介.162.7.3 MC78L05 电源电路简介.172.7.4 DS1302 时钟电路简介 .182.7.5 键盘控制模块简介.
