A Hands-Free Obstacle Detection and Avoidance System

M. Abdul-Niby, M. Alameen, O. Irscheid, M. Baidoun, H. Mourtada


In this paper, we present a low cost hands-free detection and avoidance system designed to provide mobility assistance for visually impaired people. An ultrasonic sensor is attached to the jacket of the user and detects the obstacles in front. The information obtained is transferred to the user through audio messages and also by a vibration. The range of the detection is user-defined. A text-to-speech module is employed for the voice signal. The proposed obstacle avoidance device is cost effective, easy to use and easily upgraded.


intelligent navigation capabilities; electronic travel aids; ultrasonic sensor

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D. Pascolini, S. P. Mariotti, “Global estimates of visual impairment: 2010”, British Journal of Ophthalmology, Vol. 96, No. 5, pp. 614-618, 2012



http://www.techopedia.com/ definition/16446/state-diagram

Ultrasonic Transducers Technical Notes, Olympus, 2006 (available at: www.olympus-ims.com/data/File/panametrics/UT-technotes.en.pdf)


Emic 2 Text-to-Speech Module (#30016), Parallax inc, 2012 (available through: Mouser Electronics Website http://www.mouser. com/ds/2/321/30016-Emic2TextToSpeech-v1.1-27211.pdf)

LV-EZ1MaxbotixUltrasonic, Rangefinder, http://www.adafruit.com/ products/172

Sparkfun.com. 2009. Vibration Motor-ROB-08449-SparkFun Electronics (available at: https://www.sparkfun.com/ products/8449)

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