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Our aim is to develop an affordable technology which is cheap and can be a substitute eyes for blind people. As a first step to achieve this goal we decided to make a Navigation System for the Blind. Our device consists of the following 2 parts: 1) Embedded Device: can be used to detect local obstacles such as walls/cars/etc. using 2 ultrasonic sensors to detect the obstacles and vibrator motors to give tactile feedback to the blind. 2) Android App: will give the navigation directions. Can be installed on any android device: cellphone/tablet/etc.
Bharambe et al. (Mon,) studied this question.