摘要
超声波测距仪具有使用方便、可靠性高、不受气候条件影响等特点,目前被广泛应用于倒车雷达、建筑施工工地以及一些工业现场,进行车距、液位、井深、管道长度等参数的测量。在不同的应用场合,对超声波测距系统的精度要求不同,通常使用的由单片机控制的超声波测距系统的误差一般都较大,在某些工业场合下不能满足测量要求。文章提出了一种利用定时/计数器8254提高超声波测距系统精度的方法,并给出了相应的软、硬件结构。关键词 单片机;定时/计数器8254;
Ultrasonic is characterized by easy operation and high reliability and it is free from climate changes, so that it is being widely used to measure the distance between cars, water levels and the depth of the well and etc. Different situations need different systemic precision. The commonly used ultrasonic ranger controlled by single chip microcomputers has a relatively big error and therefore can not meet special needs. This paper proposes a method of using timer/counter 8254 to improve precision in Ultrasonic Ranging and provides the corresponding software and hardware architecture.
出处
《电子科技》
2005年第4期53-55,共3页
Electronic Science and Technology
关键词
单片机
定时/计数器8254
中断
Single-chip microcomputer
timer/counter 8254
interrupt
