need help

[cyb0rg777]

OK i was hoping to do this myself but i can't figure it out .This circuit might be useful to someone ,especially the disabled .It's not a new idea but I think it is a new design .The closest thing to it that I can find is IRIS .If anyone gets this to work could you please release a schematic so we can all build and experiment.I'm not sure how safe it is though.Thanks.

 

[cyb0rg777]

I might get more people interested if I had just said its an eye position sensor.

 

[dknguyen]

asd

Is that how it really works? IR reflection off of the cornea? I always though it worked by a camera staring at the eye and tracking the pupil. IR seems much more convenient..but yeah I am not sure about saftey either. Seem straightfoward enough if its IR.

 

[cyb0rg777]

There are many devices using IR already .This one has advantages and disadvantages I guess.It is much cheaper than a camera.It only recieves light from one emitter at a time and the light reflects back to the detector .It doesn't show analog positions .It should be stable even in ambient light.The problem I'm having is the reciever/demodular section .The idea came from a photography book .it said if you want to reduce the red eye effect move your flash away from the camera ,so I did the opposite. The emitter/detectors
are working beyond their range but with a little amplification they should still work.

 

[akg]

i donno would this work , but i have seen the eye tracking system that uses IR camera+emitter , the emitters are mounted around the camera , and the camera sees a 'red-eye'(not in the visible , but in the IR spectrum:-iris won't respond to low IR) so that it can track the pupil , a image processing algorithm computes our focusing point from the position of out two pupils

 

[cyb0rg777]

I have gotten this to work with no ambient light using the simple circuit in the attachment.eye tracking systems cost hundreds or thousands .this costs very little.At least it would make a good toy.It might even be worth something.

 

[cyb0rg777]

Your right it reflects off the pupil.I'm not an eye doctor ! Would make a great project for school or something.Does anyone have experience using these reflective object sensors?