Ultrasonic navigation based blind aid for the visually impaired

Ultrasonic navigation based blind aid is built to guide the visually impaired and blind to walk easily in urban areas. The proposed system operates in two modes namely hurdle detection mode and fixed mode. In the hurdle detection mode, we have used ultrasonic sensor and water sensor to avoid obstacles using arduino. In this mode, the system detects solid and liquid obstacle sending respective instruction to the blind person through voice message via Bluetooth. The fixed mode provides the information and guidance to move from one place to another safely by setting a fixed route in blind stick from source to destination location. In addition to the above features, the system provides instructions to the blind to migrate to various places using the GPS system. An android device application is used to send messages via Bluetooth. The proposed system provides complete guidance and protection to a blind person under various circumstances.