51时钟论文

电子设计竞赛论文 题 目：51时钟及数字温度计 作 者：李斯 李高坤 汪厚峄 指导老师：竞赛委员会全体指导老师 二○一一年四月 51时钟及数字温度计 1 摘 要 51时钟是以STC89C52为基础开发的一款时钟。可应用于生活工作等多个方面，结构简单，使用方便。 51时钟是根据STC89C52内部定时器定时的原理制成的，在定时器工作模式1的环境下，给定时器装入初值，溢出后中断，计时一秒。在通过单片机内部程序处理，将时间显示到数码管上，从而构成一个时钟。同时，通过键盘可以对时间初值进行设置，并对时钟进行控制，从而实现了时钟的可控。 本次51时钟的设计实现了显示，键盘和STC89C52组成的外围数据处理，对键盘输入的数据进行再处理和分析，并将结果显示在数码管上，并可以通过键盘对前端的探测进度进行设置。 随着现代信息技术的飞速发展和传统工业改造的逐步实现．能够独立工作的温度检测和显示系统应用于诸多领域。传统的温度检测以热敏电阻为温度敏感元件。热敏电阻的成本低，但需后续信号处理电路，而且可靠性相对较差，测温准确度低，检测系统也有一定的误差。与传统的温度计相比，这里设计的数字温度计具有读数方便，测温范围广，测温精确，数字显示，适用范围宽等特点。选用STC89C52型单片机作为主控制器件，DSl8B20作为测温传感器通过4位共阳极LED数码管串口传送数据，实现温度显示。通过DSl8B20直接读取被测温度值，进行数据转换，该器件的物理化学性能稳定，线性度较好，在0℃~100℃最大线性偏差小于0.1℃。该器件可直接向单片机传输数字信号，便于单片机处理及控制。另外，该温度计还能直接采用测温器件测量温度，从而简化数据传输与处理过程。

关键字： 时钟； 单片机； 温度传感器； 数字温度计； 51时钟及数字温度计 2 Abstract 51 clock is based STC89C52 the development of a clock. Can be applied to life work, etc, the structure is simple and easy to use. 51 STC89C52 internal clock is based on the principle of the timer timing made the timer working mode 1 environment, give timer interruption, spilling into initial after a second, timing. In processed by microcontroller internal to the digital time display, will that make a tube clock. Meanwhile, through the keyboard can on time of initial values Settings, and control, so as to realize the clock of clocks controllable. The design of the 51 clock to display, keyboard and STC89C52 composition peripheral data processing, the keyboard input data processing and analysis again, and the result showed that in the digital tube, and may through the keyboard on the front of detection progress Settings. With the rapid development of modern information technology and traditional industrial transformation gradually realize. Able to work independently temperature detection and display system applied to many fields. The traditional temperature testing to thermistors for temperature sensitive components. Thermistors cost low, but need to subsequent signal processing circuits are relatively poor, and reliability, low temperature measurement accuracy, detection system also has the certain error. Compared with the traditional thermometer, the digital thermometer design here with convenient, measuring temperature readings range, temperature measurement precision, the digital 51时钟及数字温度计 3 display characteristics, wide application scope. Choose STC89C52 type microcontroller as the main control devices, DSl8B20 as temperature sensor through four altogether anode LED digital tube serial transmit data, realize temperature display. Tested by DSl8B20 directly read data transfer, temperature, chemical and physical properties of this device is stable, linear degrees in 0 ℃ ~ 100, less than 0.1 ℃ maximum linear deviations ℃. This device can transmit digital signals directly to the microcontroller, facilitate microcontroller treatment and control. In addition, the thermometer also directly using temperature measuring device measuring temperature, thus simplifying the data transmission and processing.

Key word: clock; SCM; Temperature sensors; Digital thermometer; 51时钟及数字温度计

4 目录 1 方案设计 .......................................................................................................................................... 4 1.1 理论分析及芯片采用依据 ....................................................................................................... 4 1.2 总体设计方案 ............................................................................................................................. 4 1.2.1 中央处理单元 ..................................................................................................... 5 1.2.2 电源电路部分 ..................................................................................................... 5 1.2.3 温度计部分 ......................................................................................................... 5 1.2.4 显示部分 ............................................................................................................. 6 1.2.5 4*4 键盘部分 ..................................................................................................... 6

2 硬件设计 ............................................................................................................................................ 7 2.1 单片机 ......................................................................................................................................... 7 2.2 数码管 ......................................................................................................................................... 7 2.3 键盘 ............................................................................................................................................. 8