E.g. one of these:
http://www.instructables.com/id/The-EyeWriter-20/
I've got things assembled and blinkenlights from the LEDs but the eye tracking performance just isn't there.
http://www.instructables.com/id/The-EyeWriter-20/
I've got things assembled and blinkenlights from the LEDs but the eye tracking performance just isn't there.