This Eye Blink sensor senses the eyeblink using infrared. The Variation Across the eye will vary as per eye blink. If the eye is closed the output is high otherwise the output is low.
 
 Feature and Specification:
EYE BLINK indication by LED
Instant output digital signal for directly Connecting to the microcontroller
Working Voltage +5V DC
TTL output 5V or 0V
used for digital Eye Blink monitor
used for Vehicle Accident prevention.
Suite for real-time driving applications.
Onboard 3-pin header
Sensor device: QRD1114