need help - Electronic Circuits Projects Diagrams Free

cyb0rg777 · 25th May 2006, 08:16 PM

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 · 25th May 2006, 08:43 PM

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

dknguyen · 25th May 2006, 10:19 PM

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 · 25th May 2006, 11:07 PM

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 · 26th May 2006, 07:41 AM

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 · 26th May 2006, 04:53 PM

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 · 2nd June 2006, 06:57 AM

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?

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25th May 2006, 08:43 PM	(permalink)
cyb0rg777	I might get more people interested if I had just said its an eye position sensor. __________________ Reality

25th May 2006, 10:19 PM	(permalink)
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.

25th May 2006, 11:07 PM	(permalink)
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. __________________ Reality

26th May 2006, 07:41 AM	(permalink)
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 __________________ Gods own Country Incredible !ndia www.flickr.com/photos/_akg/ "Give a man a fish, and he will eat for a day. Teach that man to fish, and he will eat for a lifetime."

26th May 2006, 04:53 PM	(permalink)
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. __________________ Reality

2nd June 2006, 06:57 AM	(permalink)
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? __________________ Reality