英语翻译随着人们生活水平的提高,人们对于生活质量的要求也日益增加,尤其是对健身的要求,自行车也不再仅仅是普通的运输、代步

As people's living standards improve, people's requirements for quality of life increasing, especially for the requirements of fitness, cycling is no longer just an ordinary transport, means of transport, but become entertainment, leisure, exercise of choice. Bicycle speedometer to meet basic human needs, so that people can clearly guide the current speed. With the rapid development of science and technology, SCM applications are increasingly being used and promote the traditional control detection technology constantly updated. Most of the current electronic speedometer, and LCD with LED digital tube, or real-time display, display more intuitive. Electronic speedometer instead of using the contact speed sensor shaft drive, can not be installed speedometer distance limitations, and further mechanical effectively overcome the disadvantages of speed tables. Described in this thesis is based on Hall element of the gun design. The AT89S51 microcontroller core, A44E Hall sensor speed measuring the number of measurements to achieve the speed of the bike, and can speed bike with LCD time display. This paper describes a bicycle speedometer of hardware and software design. Hardware components will be a bike by Hall the number of pulses per revolution into the SCM system, SCM system and then send the signal through the processing display. Software components in assembly language programming, modular design. The hardware circuit is simple, routine versatile, fully meet the design requirements.