基于STC89C52单片机的超声波测距系统  

Ultrasonic ranging system based on STC89C52 micro-controller

作　　者：张雷雷[1] 王福豹[1] 段渭军[1] 

机构地区：[1]西北工业大学电子信息学院,陕西西安710072

出　　处：《电子设计工程》2015年第4期120-123,共4页Electronic Design Engineering

摘　　要：为了实现对中短距离的测量,比如在智能小车避障、车辆定位中对前方的障碍物进行判断,利用主控器件单片机和一系列外围器件进行超声波测距系统的设计。具体设计包括超声波发射电路、超声波接收电路、液晶显示电路及温度补偿电路等硬件模块,并利用Keil C平台进行了相应的软件设计。其中在接收电路中设计的增益控制部分有效地解决了当回波信号过于微弱时系统测量误差加大的难题。在实验室对设计好的测距系统进行了实地性能测试,实验表明,系统的测距最大值为120 cm,测量精度为0.1 cm。In order to realize the measurement of short distance,such as in obstacle avoidance of smart car and vehicle positioning,there is the need to judge the obstacles,paper designs the ultrasonic ranging system in the use of STC89C52 and other devices.Specific designs include ultrasonic transmitter circuit,ultrasonic receiver circuit,liquid crystal display circuit and temperature compensation circuitry.and the corresponding software design in the use of Keil C platform.In the reception circuit section,the design of gain control circuit effectively settles the problem in the situation where the echo signals are so weak as to increase the measurement error.In the laboratory,the ranging system designed are tested to observe its performance.Experiments show that the ranging maximum of system designed is 120 cm,and the measurement accuracy is 0.1 cm.

关 键 词：渡越时间法 STC89C52 MAX864 增益控制 

分 类 号：TN409[电子电信—微电子学与固体电子学]