1、 I 霍尔传感器测量车速系统设计霍尔传感器测量车速系统设计 摘 要摘 要 本文介绍了霍尔传感器测速的原理，设计了基于单片机 AT89C51 的测量车速系统。完 成了车速测量系统的硬件电路设计、霍尔传感器测量电路的设计、显示电路的设计。测量 转速的霍尔传感器和车轴同轴连接，车轴每转一周，产生一定量的脉冲个数，由霍尔器件 电路部分输出幅度为 12V 的脉冲。经光电隔离器后成为输出幅度为 5V 转数计数器的计数 脉冲。控制定时器计数时间，即可实现对车速的测量。在显示电路设计中，通过 1602 实 现在 LCD 上直观地显示车轮的转速值。与软件配合，实现了显示、报警功能。 关键词：车速测量；霍尔传感器
2、；单片机；89C51；LCD II Abstract This paper introduces the principle of the hall sensors, speed, the design based on single chip microcomputer AT89C51 measurement speed system. Completed the speed of the measurement system hardware circuit design, hall sensor measurement circuit design, display circuit de
3、sign. Measurement speed hall-effect sensor and axle coaxial connected, every turn a week axle, produce a certain amount of the number of the pulse, the hall device circuit of the output amplitude for 12 V of the pulse. By photoelectric isolated after the output amplitude for 5 V become number of tur
4、n counter pulse count. Control the timer counting time, to speed measurement can be realized. The display circuit design, through the 1602 to realize in LCD display directly on the wheel speed value. And with the software to display and alarm function. Key Words: Speed Measurement; Hall Sensor; Microcomputer; 89C51；LCD III 目 录 一、内容及要求 错误错误! !未定义书签。未定义书签。 1.1 设计内容 1 1.2 设计要求 1 二、霍尔传感器测量车速系统硬件设计 1 2.1 车速测量系统的硬件电路设计 1 2.1.1 总体硬件设计 1 2.1.2 系统电路设计 2 2.2 霍尔传感器测量电路设计 3 2.2.1 霍尔元件 3 2.2.2 霍尔传感器测量原理 4
