CAJ | 학술논문

设计介绍了一种基于单片机STC89C52的超声波测距系统,在本设计中超声波发射部分创新性的使用了MAX232芯片,缩小了盲区.在接收部分采用了比较器整形电路来提高测量精度.并且在硬件上采用了温度传感器18B20来采取声速预置和媒质相结合的方法对声速进行温度补偿,实现实时测距倒防撞的功能,以降低声速变化对测量的影响.
설계개소료일충기우단편궤STC89C52적초성파측거계통,재본설계중초성파발사부분창신성적사용료MAX232심편,축소료맹구.재접수부분채용료비교기정형전로래제고측량정도.병차재경건상채용료온도전감기18B20래채취성속예치화매질상결합적방법대성속진행온도보상,실현실시측거도방당적공능,이강저성속변화대측량적영향.
This paper introduces an ultrasonic distance measurement system based on the STC89C52 SCM for automobile anti-collision.In order to narrow down blind area,the chip MAX232 was creatively used in the ultrasonic transmitter.The comparator shaping circuit was used in the ultrasonic receiver to improve the measuring precision.In addition,the temperature sensor 18B20 was adopted to act temperature compensation.So the influence of change of sonic speed on measurement was reduced.