The design uses the STC89C51 single chip microcomputer as the kernel control er,using ultrasonic ranging principle to measure the distance of the obstacles before the blind.,and put the obstacle distance information into sound reminders stored in voice chip,through the single-chip microcomputer control CSR BC417143 bluetooth module to transmission the voice to bluetooth earphone,the blind judge whether there are obstacles around according to the voice after receiving the voice,thus to make path selection,to act the role of guide.% 本设计采用STC89C51单片机作为内核控制器，利用超声波测距的原理，对盲人前面道路上的障碍物进行距离探测，并把障碍物距离信息变成声音提示存储在语音芯片内，通过单片机控制蓝牙模块CSR BC417143把语音传送到蓝牙耳机，盲人收到语音后根据提示语音来判断周围是否存在障碍物，进而做出路径选择，达到导盲作用。
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