Abstract
Distance is an important parameter which need for detection and control on different occasions, so it is also an important problem need to solve in data acquisition. Although there are a variety of ways for range distance measurement, ultrasonic distance measuring the ultrasonic distance measuring may be a simple and practical way. ultrasonic distance measuring is widely used in industrial production and daily life. Ultrasonic distance measuring is always realized by measuring the time ultrasonic wave source spread between the source and the detected objects to calculation the distance, when the wave speed is unchanged.
My design takes Micro-controller AT89C51 as control central which is low-cost, high accuracy, miniaturization and digital display. MCU measure the time ultrasonic wave source spread between the source and the detected objects to calculation the distance in this system .This paper present the system structure, circuit schematic diagram and the program. Temperature compensation and double comparator shaping circuit are used in data processing.
