Abstract
With the developing of people’s life, the bicycle is not only the universal tool of
transportation and substitute for walking, but becomes the first choice of
entertainmenting and exercising. The bicycle mileage/speed can fulfill the basic need
of people’s life, so that they can learn the speed and the mileage of the bicycle. In these
paper, the bicycle mileage/speed design based on the Hall element is elaborated. By
AT89C52 as kernel, using A44E Hall element to measure revolution, the measure and
statistic are achieved. The range informations are saved by 24C02 when the power is
off, the bicycle speed can be displayed on LED. In this article, the hardware circuit and
software design of bicycle mileage/speed instrument are introduced in detail. About the
hardware, the pulse number is transmitted of one cycle of the bicycle into Single Chip
Microcomputer system. Then the signal processed by Single Chip Microcomputer
system is sent to display scream. About the software, in assemble language, the
program is designed in the mode of modules. The system has simple hardware,
common sub-program, and meet the demand of design.
Keywords:Mileage / speed;Hall element; Single Chip Microcomputer; LED
