ABSTRACT
Ultrasonic wave has strong pointing to nature ,slowly energy
consumption ,propagating distance farther ,so, in utilizing the scheme of distance
finding that sensor technology and automatic control technology combine
together ,ultrasonic wave finds range to use the most general one at present ,it
applies to guard against theft , move backward the radar , water level measuring ,
building construction site and some industrial scenes extensively。
This subject has introduced principle and characteristic of the ultrasonic sensor in
detail ,and the performance and characteristic of one-chip computer AT89S51 of
Atmel Company ,and on the basis of analyzing principle that ultrasonic wave
finds range ,the systematic thinking and questions needed to consider that have
pointed out that designs and finds range ,provide low cost , the hardware circuit of
high accuracy , ultrasonic range finder of miniature digital display and software
design method taking AT89S51 as the core ,this circuit of system is reasonable in
design, working stability, performance good measuring speeding soon ,
calculating simple , apt to accomplish real-time control ,and can reach industry's
practical demand in measuring the precision 。
Key Words: Ultrasonic wave; One-chip computer; Range finding; AT89S51
