Hacked Gadgets Forum

May 11, 2010

Eye Tracking using IR LEDs and IR Transistors

at 3:00 pm. Filed under Complex Hacks, DIY Hacks, Electronic Hacks



Ray Ho and Ayo Ositelu from Cornell University came up with an inexpensive (around $25) way to do eye tracking. They’re using an IR LED and an IR transistor to get the job done. They note that the best way to perform eye tracking is to use a camera and process the image but this would require more processing power than they had. We have seen eye tracking done before here and here but this is the first time I have seen it done on the cheap like this. Great job guys!

“The outcomes expected from this project rely on the wonderful properties of light. Specifically, we note that incoming light rays hitting an object will either be reflected or absorbed. The degree to which reflection and/or absorbance takes place depends on material properties of the object. We expect a higher signal stemming from light directed to the pupil as compared to light directed toward the sclera. Nearly all the light directed toward the entrance pupil is absorbed. The white color of the eye reflects a majority of the light rays directed towards it. The ratio of light rays absorbed to reflected when directed to the iris depends on the eye color, with those eye colors darker in tone pigmentation yielding the higher signals.”


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4 Responses to “Eye Tracking using IR LEDs and IR Transistors”

  1. The voice in your head Says:

    Is it safe? I mean you can’t see it but it’s still shining a bright light in your eye.

  2. Tom Says:

    You can hurt your eyes with near infrared (~ 1000 nm) light, and the worst part is you would not know your doing it, the light is focused on your retina and the receptors can not detect it.
    Even with light over 1500 nm there is potential to damage your eyes but the cornea would be effected not the retina.

  3. Melissa Cordstone Says:

    all I can say is this is some crazy stuff! Be careful or else you’ll go blind!!!

  4. chander parkash Says:

    i am final year b.tech student and this my project so plz send me all detail and block diagram and circuit diagram of this project plzzzz

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