22-03-2016, 02:32 PM
ir sensor working principle for eye blink
INTRODUCTION
The eye-blink sensor works by illuminating the eye and/or eyelid area with infrared light, then monitoring the changes in the reflected light using a phototransistor and differentiator circuit. The exact functionality depends greatly on the positioning and aiming of the emitter and detector with respect to the eye.
FEATUTRES
EYE BLINK indication by LEDInstant output digital signal for directlyConnecting to microcontrollerCompact SizeWorking Voltage +5V DC