【正文】
voice alarm device. Data gotten from ultrasound glasses detector has been put into process by 51 MCU and then be sent into air by wireless module. After that ,the voice alarm device will get the data from another a voice alarm .Cheap, convenience and other advantages make it a perfect device for blind man. Studies are made on the embedded systems and ultrasonic distance measurement system. Porting embedded operating system and giving optimization method for obstacle detection, and measuring the obstacles distance by ultrasonic ranging works. The experimental results she that the system achieved to deal with circumstance and judge accuracy of realtime requirements in a natural blind road, which may provide better serves for the blind’s independent travel. KEY WORD : 51 MCU Voice alarm Ultrasound detector Wireless module Guide system for blind 目 錄 摘 要 ............................................................................................................................................. I Abstract.........................................................................................................................................II 第一章 緒言 ................................................................................................................................ 1 第一節(jié) 總體方案 ................................................................................................................. 1 第二章 硬件電路的設計 ............................................................................................................ 2 第一節(jié) 超聲模塊電路 ..........................................................