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1、 智能化多功能转速表设计CHANGSHA UNIVERSITY OF SCIENCE 单片机;驱动器 MC14499 智能化多功能转速表设计Design of intelligent multi-function tachometer ABSTRACT On the rotational speed table design has many available, but mostly by mechanical or simulated digital circuits to achieve. There are large in size, precision low, not visua
2、l, electronics large, less functional and sampling time, it is difficult to detect instantaneous rotational speed. As the Micro Controller Unit with both small and control functions such strong characteristics, so it widely in control applications. We want multifunctional rotational speed control sy
3、stem is designed to the Micro Controller Unit as the core to achieve intelligent meters. It is more functional, small electronics, and visual accuracy, showing time, speed warning systems, printing, such as instant rotational speed advantage. The article explained the photoelectric sensors such rota
4、tional speed table operating principles, structure and rotational speed switching circuit design. The design is a decoder MC14499, which is integrated high degree LED MOTOROLA companies that drive, a dynamic scanning driven four LED digital display control. It sets Suocun, decoding, driving, scannin
5、g, the clock on integration. Key words: ey words: the rotational speed; the Micro Controller Unit; a decoder MC14499 智能化多功能转速表设计目录 1 绪论.1 1.1 转速表的历史、现状及发展趋势.1 2 总体设计方案.4 2.1 设计要解决的问题和设计方案.4 2.2 硬件电路的设计方案与框图.7 3 硬件电路设计.8 3.1 外部存储器设计.8 3.1.1 扩展思想.8 3.1.2 扩展系统硬件电路说明.8 3.2 输入转速脉冲测量电路设计.10 3.3 转速静态数码显示电路
6、设计.11 3.3.1 LED七段数码管显示方法 .11 3.3.2 转速静态数码显示电路.11 3.4 声光报警电路设计.13 3.5 打印输出设计.13 3.6 键盘接口设计.14 3.7 元器件的选择.15 3.7.1 LED显示驱动器MC14499.15 3.7.2 LED显示器 .16 3.7.3 P-P-40/16A微型打印机.17 3.7.4 看门狗MAX831L .18 3.8 直流稳压电源.18 4 系统软件设计.20 4.1 软件设计概述.20 4.2 软件设计方案.21 4.2.1 主程序设计.21 智能化多功能转速表设计4.2.2 按键子程序设计.29 4.2.3 转速静态数码显示子程序设计.34 4.2.4 声光报警子程序设计.37 4.2.5 打印机子程序设计.39 5 总结.41 参考文献.
