A guidance system for helping the blind find the way is described. Means to generate modulated signals of different frequencies is there and also a means to amplify and transmit these signals through conductors along the path of the journey. A cane recieves the signals through oscillating means responsive to each signal. It also comprises an amplifier to amplify the signals so that it can be detacted by many persons carrying such recievers along the path.

An oscillator, amplifier and a pulse generator makes up the reciever stick. This syst ....etc

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MICROCONTROLLER BASED WALKING AID FOR BLIND & DEAF

Abstract
Biomedical engineering specializes in making life easier for the physically challenged. Our project is an endeavor in this direction. IR sensor mounted on to the stick is used for detecting obstacles in the path of the user and a vibrational feedback is provided which is decided by microcontroller. The same circuit is mounted on a cap for detecting overhanging obstacles. ....etc

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Ultrasound Usage in Mobility Aid Systems



The mobility aid system works on the simple principle of reflection of sound waves from the obstacle or an object. For this set up, the system has a simple battery operated circuit, acting as an oscillator producing the required 40 KHz frequency for the operation of the ultrasound generator. The ultrasound generator generates sound waves, which are higher in frequency than the human audible range . Thus generated, sound waves bu ....etc

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Abstract
Blind people need to become as independent as
possible in their daily life in order to guarantee a fully social
inclusion. Mobility means the possibility of freely moving,
without support of any accompanying person, at home, in public
and private buildings, and in open spaces, as the streets of the
town. Mobile and wireless technologies, and in particular the
ones used to locate persons or objects, can be used to realize
navigation systems in an intelligent environment. Such systems
open new opportunities to improve the ....etc

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for More Info About MICROCONTROLLER BASED WALKING AID FOR BLIND DEAF ppt

http://seminarsprojects.net/Thread-microcontroller-based-walking-aid-for-blind-deaf?pid=20983 ....etc

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Abstract

In foam extrusion, material density is the most significant factor affecting the product cost and therefore the profitability of the manufacturing process. A reduction in the density of extruded parts reduces the raw material cost and therefore increases its profitability. On the other hand, a reduction in foam density degrades the mechanical properties and geometrical accuracy of extruded parts. Therefore, a critical balance has always to be achieved in order to minimize the material cost while maintaining adequate strength and acc ....etc

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please send me the detailed circuit diagram for ultrasound walking stick along with its description ....etc

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Carl Fischer
Computing Department
Lancaster University
Lancaster, UK.
--
Kavitha Muthukrishnan
Faculty of Computer Science
University of Twente
Enschede, The Netherlands.
--
Mike Hazas
Computing Department
Lancaster University
Lancaster, UK.
--
Hans Gellersen
Computing Department
Lancaster University
Lancaster, UK.

ABSTRACT

Ad hoc solutions for tracking and providing navigation sup- port to emergency response teams is an important and safety- critical challenge. We propose a navigation system based on ....etc

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hai sir..,
I m v.vanitha studing b.tech 3rd year . I want to know about the obstacle avoidance and manhole detection for the blind people by using with and without sensors and also the block diagram regarding this topic.

Thanking you,

yours faithfully,
v.vanitha
please say me about sensors used in manhole detection for blind people ....etc

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Abstract:
Ultrasound Identification is a Real Time Locating System (RTLS) is used to automatically track and identify the location of objects using simple inexpensive nodes (badges/tags) attached to or embedded in objects and devices which then transmit an ultrasound signal to communicate their location to microphone sensors.Ultrasound-based IPS is considered a better alternative to passive Radio-frequency identification (pRFID) in complex indoor environments (such as hospitals), where radio waves may reflect off of metallic or ceramic object ....etc

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