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Design of a Low-cost Autonomous Mobile Robot
Kasun Kosala, Ravinda Gayan Meegama
Pages - 1 - 13     |    Revised - 31-03-2011     |    Published - 04-04-2011
Volume - 2   Issue - 1    |    Publication Date - March / April 2011  Table of Contents
Mobile Robot, Voice Recognition, Robot Navigation
Detection of obstacles during navigation of a mobile robot is considered difficult due to varying nature in terms of size, shape and location of the obstacle as well as ambient light that interferes with infra-red (IR) signals of the robot. In this paper, we propose a novel low-cost method that successfully guides a robot along a path using image processing and IR sensor circuits. A high continuous IR signal is converted into a low continuous IR signal by means of a demodulation circuit that enables a peripheral interface controller to receive this low continuous IR signal and take relevant decisions based on the signal. The images taken from a web camera are preprocessed to remove noise and detect edges. Subsequently, an image processing routine effectively calculates the angle to be rotated of the front wheels using a scan line algorithm. A minimum mean distance error of 2.45 was observed in tracking the path at a signal-to-nose ratio of 26.50. The accuracy of speech recognition was 92% for two voice training sessions.
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[online] http://www.avt.me.vt.edu/index.htm.
Mr. Kasun Kosala
University of Sri Jayewardenepura - Sri Lanka
Dr. Ravinda Gayan Meegama
University of Sri Jayewardenepura - Sri Lanka

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