【摘要】 介绍了 AT89C2 0 5 1单片机的性能及特点 ,及以其为核心的一种低成本、高精度、微型化、数字显示的汽车防撞报警器。该防撞报警器利用超声波及集成霍尔元件实现对汽车的测距和测速 ,利用单片机的实时控制和数据处理功能 ,完成系统的控制。文章给出了报警器的硬件电路原理及软件设计。更多还原

【Abstract】 It introduces the function and characteristics of microcontroller AT89C2051. Based on it, a low-cost, high-accuracy, microminiaturization and digital display proximity warning indicator for automobile is designed. The indicator measures the distance and speed of the automobile with ultrasonic wave and integrated Hall unit, and controls the system by the real-time control and data-processing of the microcontroller. Moreover, its circuitry principle is introduced in detail as well as its software design.更多还原