[AI] modified stick for visually chalenged
harish at accessindia.org.in
Sun Jun 22 20:31:06 EDT 2008
Seems a brilliant work. Any contacts of the developers of those canes. If anyone is able to establish contact of them, please do put in a mail on the list as well.
I wish they had used the word canes in lieu of stick however, that is somewhat small issue.
----- Original Message -----
From: "l pavan" <l.pavan.get at gmail.com>
To: <accessindia at accessindia.org.in>
Sent: Sunday, June 22, 2008 9:19 PM
Subject: [AI] modified stick for visually chalenged
> hello list members i have read this artical while i was searching for
> some thing on the net.
> i thought that it would be informative to you all and so iam mailing
> this to the list if you know about this pls ignore.
> Modified stick for the visually challenged
> Student Awards
> Sanket V. Chitagopakar and Prashant V. Harshangi
> City: Gulbarg
> State: Karnataka
> Sanket V. Chitagopakar (17) and Prashant V. Harshangi (17) are from
> Gulbarga, Karnataka. They are both in the second year of their Pre
> University Course.
> Prashant's parents are doctors and his brother is studying medicine.
> Sanket's father is a doctor and his mother is a housewife. His brother
> is studying
> in the tenth standard.
> It was on the 17th of July, 2002 and Gulbarga city had received the
> first showers of the year. There were puddles everywhere and Sanket
> happened to observe
> that a blind man who was walking by with a stick fell in one. It was a
> sad sight. The next day Sanket discussed this incident with his friend
> and they conceived the idea for the stick.
> Under the guidance of their teacher Mr. R. Hemant of the
> Sharnabasaveshwar Public School Gulbarga, they contacted Prof. Y.N.
> Ravindra who gave them a brief
> idea of the circuit and they started the project. Both relate that
> they faced a number of technical problems while developing the
> innovation. The main
> hitches were in fixing the circuit onto the stick and fixing the IR
> sensors and IR LEDS. They acknowledge the guidance of Prof. Y.N.
> Ravindra who gave
> them many useful tips and hints, which made the development easier.
> After days of hard work they prepared the circuit and the model. Next,
> the prototype
> was given to the local blind school for testing. The students of the
> blind school found the innovative stick more convenient than the
> existing alternative.
> Multiplexers are used to sense obstacles in different directions
> simultaneously. This means, the blind person might receive different
> signals on obstacles
> in different directions around him through the headphone. The moisture
> sensing electrodes sense the moist soil or stagnant water. This can be
> helpful during the rainy season. It also contains micro-switches, to
> detect manholes. Finally, in order to make the system more versatile,
> an anti-theft
> alarm is also incorporated to warn the user if the stick is being
> stolen. It is known that in most of the visually challenged, the other
> sense organs are
> highly developed. That's why the creators think the stick will
> effectively serve the purpose. They haven't made any move to
> commercialise it. This device
> costs Rs.800.
> Social relevance
> Blind people totalling over 1.5 million have difficulty in travelling
> and successfully sensing obstacles, manholes and puddles of stagnant
> water. They need
> support for all their activities. They need a third leg i.e. the stick
> to walk. One of the primary problems faced by the visually challenged
> is to walk
> freely in a public place. The outside world is rife with dangers
> especially when they leave their dwelling place, as they may fall down
> and injure themselves
> or stumble against an electric pillar or meet with an accident. Thus
> this innovative stick has great social impact as every visually
> handicapped is a potential
> user. Considering the various features and its superiority over the
> existing alternative even at the present cost, this stick is an
> essential accessory
> for blind people as it greatly enhances their mobility.
> Other applications of this innovation could be its use by sewage
> workers, miners etc or in situations where light is dim/not available
> or for military applications
> where the need is to move around without using any light source. While
> such sticks are generally known in literature, the specific
> combination of features
> such as water sensor, alarms, FM transmitter etc., have not been
> reported in any one stick.
> Pride of the family
> "Till now nobody in our family has done anything innovative. But they
> may now get inspired from us and do something in the near future!"
> declare Sanket
> and Prashant. These young innovators have always had a tendency to try
> and understand everything. This tendency and flair for improvisation
> coupled with
> a curious nature played a vital role in making their innovation a
> success. Their family's pride in them is revealed in one sentence,
> "These two have a
> genius dancing between their ears". They go on to explain, "What made
> us support them in this course was their attitude towards this
> project. It was not
> merely mechanical but it was for a cause- to help the blind. Of course
> we were a bit worried about their studies. In this competitive world
> we just lay
> stress on our children's academics. Yet, innovative thinking is
> necessary and there lies the real creativity of every person." Sanket
> and Prashant have
> also made a project titled 'Automatic dipper'- the main use of which
> is to automatically dip the headlights of the vehicle at nights on
> highways. Many
> accidents are caused, because of bright light. So this innovation
> helps in avoiding such accidents. Currently Sanket and Prashant aren't
> working on any
> other idea. These students are grateful for the considerable
> encouragement they received from their family, friends and teachers.
> They have exhibited this
> innovation in the Intel Science Talent Discovery Fair- 2002 and won a
> prize. After this it was covered in a number of newspapers. They also
> recall with
> happiness, the fact that the community had rained applause and
> appreciation on them in the wake of their innovation. On asking about
> their dreams for the
> future, Prashant explains he would like to become an engineer in the
> stream of either electronics or automobiles. But Sanket is categorical
> in stating
> that he doesn't want to reveal his future plans to anybody, as yet.
> The electronic blind stick uses a PCB with a host of components
> including Integrated Circuits (IC 555, IR Sensor), semiconductors
> (Transistor-BC557, IR
> LED), passive components such as resistors, preset, capacitors and
> diodes along with headphones, IC base and the base 1" PVC pipe which
> functions as the
> stick and a separate handle. This device makes use of a total of five
> sensing circuits. Three of them use IR reflective sensing techniques
> to sense the
> presence of obstacles. Each sensor (IR) is individually AMV gated,
> stimulated by a switching circuit with assigned frequency. The
> principle of working
> consists of generating 32 KHz wave using the IC1 (555), which is fed
> as input to the IR LEDs emitting IR rays. These rays are reflected
> back from the obstacle
> and the IR sensors absorb these rays and activate the gated
> oscillator, which respectively turns the speaker on. An obstacle on
> the right side turns on
> the right side speaker; if it is on the left side, the left oscillator
> triggers the speaker on that same side. In case the object is in
> front, the forward
> sensor sends the signal to both the oscillators, so both speakers are
> turned on. The present system thus uses time decision multiplexing
> technique to transmit
> all the gated AMV frequencies sequentially. There are also
> moisture-sensing electrodes and micro-switches. gated assigned
> frequencies are multiplexed and
> transmitted with the help of a FM transmitter. The use of FM
> transmitter and receiver makes a wireless system possible.
> mail: l.pavan.get at gmail.com
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