Walking aid for the blind – undergrad project…

It’s been a long time since I’ve done anything in electronics. Well, not really; I’ve only not published them. The past few months, I’ve spent working on my undergrad project. There were mini-projects I took from time to time but this was my first major project that would be under some real scrutiny and I had to concentrate on it. This is essentially why I have been quite offline in terms of publicising my real work, although you would find my non-tech thoughts spread around the inter-webs(if you’re looking really hard, I must add – which is a very sad realisation). So, here, I bring to you my prized brainchild – Walking aid for the blind.

Walking aid - initial stages

So, that is how it looked in its initial stages. I couldn’t use my fingers for two whole days since.

Over the next few days I will be posting, in parts, my complete work on this concept. It is totally open-source. You’re free to build one for yourself. All I ask is for you to just include me in the credits.

Okay! So first let us understand what we’re building here.

Idea of the walking aid

The walking aid is supposed to be an external prosthesis that would help its recipient – a blind user – be aware of the obstacles surrounding him. The resulting device should do all of this without impairing one’s daily life. We want it to be helpful to the user but not at any expense. Of course, it is not going to be the most perfect solution but it needs to tackle the basic problem without creating new ones. Most of my project duration had me studying the implications of using different forms of sensing and alerting and long term physical and psychological effects on the user. I’m happy to say we’ve succeeded in making a device that aids without adversity.

Of course, since it is an undergrad project, we had to study the present day condition of the problem we wish to tackle. We looked up existing solutions to the plight of the blind and found a lot of them. To name a few,

  1. Seeing Aid – A pair of glasses that use mounted infrared LEDs for obstacle detection. User is notified using different tones.
  2. Laser Cane – A cane that uses three lasers for detection. Sound and vibrations (front beam only) are used to convey information.
  3. Mowat Sensor – A handheld device that emits and receives ultrasound. User is alerted using vibrations by varying intensity.
  4. Nottingham Obstacle Detector – A sonar handheld, that varies frequency of vibrations to alert the user.
  5. Sonic PathFinder – Head mounted computer controlled aid. Uses musical notes to notify the user about obstacles.

Actually, our entire list of previous endeavours on this subject and more have been listed here.

And there were a lot more devices that use a combination of their sensing and alerting mechanisms. Our device inescapably does the same, yet the end result is nowhere quite as similar to any of these solutions as they are to one another.

The final product

Our final product – again non-commercial – is a pair of shoes attached with ultrasonic sensors on the sensing side. The information, obtained from these sensors, is used to form a virtual map of the surroundings.

Walking Aid shoe side view

The shoe is the sensing member.

This information will be processed and fed to the user via one of his other working senses – we’ve used the sense of touch. We’ve used the Arduino Mega 2560 for processing and created a custom shield as a mega-connector to the rest of the contraption.

Processing circuitry for Walking Aid

This is what the processing circuitry will look like. Don’t be intimidated. We will break it down for you.

The alerting is done using a set of vibrating elements that would be placed in the user’s trouser pockets.

Alerting members for Walking Aid

Our invention requires a prior invention to work correctly – trousers or tailors.

Now, we cannot grasp it all at once. So, I’ve divided this project into parts that would, in collection, explain the whole project. We’ll be sparing no detail. Of course, spoon-feeding is not our thing. So, we will be sharing the underlying concepts with code samples that you could build on, should you wish to replicate or improve it.

As always feedback, critique, comments and suggestions are much appreciated.

Author: Denver Dias
An enthusiast of computers, developer electronics and hobby ideas (read "children's toys") that has finally made his escape from the clutches of academics to enlighten all those interested in real stuff.
  • Tim

    This is an undergrad project, honestly? I’ve seen stuff like this in highschool.

    • http://denver.revryl.com Denver Dias

      It is! I was sort of in a race with a few of my colleagues – who could pass off their high-school projects for undergrad credit? We all won…

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  • Latoya Harvey

    How much do you think it would cost to create these shoes?

    • http://denver.revryl.com Denver Dias

      I can’t estimate that for you as the prices of the components used are quite a lot higher in India than they usually are elsewhere. Find how much Arduino Mega2560 costs in your location. I’ve used a total of 6 ultrasonic sensors in my device along with 4 pressure sensors. There are a lot of common electronic components in the device including wires, headers, a lot of solder, etc. At the time I made it it cost me at most, Rs.10000 which was about $200. Of course, it would be a lot cheaper than that.
      Thanks for commenting. If you have any more questions, feel free to ask.

      • Latoya Harvey

        When did you complete the project? Are there any companies looking to buy your product?

        • http://denver.revryl.com Denver Dias

          I completed it during the month of April 2013. It took a little less than 3 months to complete. The end product could be replicated in under a week if I were to provide a basic gist of it’s workings – something I’m struggling to find the time for publishing.

          I was approached by a local biomedical engineering start up. They informed me that they would like to fund the improvement of the project to turn it into a product – you know, using industrial parts rather than hobby components. They would get back to me sometime in the future, fingers crossed…

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  • https://www.facebook.com/fames786 Muhammad Asif

    can u tell me the range of this shoe ?

    • http://denver.revryl.com Denver Dias

      I had designed it to read for obstacles in an approximately elliptical region around the subject. The front facing sensors detect objects that are up to 2.56 metres away and the side ones detect objects unto 1.28 metres from the shoes. The one in the middle detects objects up to 1.60 metres. It’s a bit complicated to justify these distances here; it’ll all be explained in follow-up posts…

      • https://www.facebook.com/fames786 Muhammad Asif

        i appreciate your work …… also want to do this as my final year project ….will you guide me further ?

        • http://denver.revryl.com Denver Dias

          I’m glad you’re considering this for your final year project. I’m willing to answer your specific queries about the concepts used and workings of the device.

          • https://www.facebook.com/fames786 Muhammad Asif

            thank you so much….

            1)what is the purpose of pressure sensor .
            2)what if, i adjust vibrator in shoes intsead to keep in pocket.Any suggestion ?

          • http://denver.revryl.com Denver Dias

            I’m going to continue this conversation via the contact info you’ve provided. Make sure to check the Other Messages on your Facebook…

  • zubair khan

    hi can you please send me complete detail of this project . i am very interested in this project but i don,t know how i start this project .thanks

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