User Manual for Eye Blink Sensor

eye-blink-sensor
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 LED
  • Instant output digital signal for directly
  • Connecting to microcontroller
  • Compact Size
  • Working Voltage +5V DC



eye-blink-led

APPLICATION

  • Digital Eye Blink monitor
  • Vehicle Accident prevention.
  • Suite for real time driving applications.

SPECIFICATION

 Parameter

 value

Operating Voltage

+5V DC regulated

Operating Current

100mA

Output Data Level

 TTL Level

Eye Blink

Indicated by LED and Output High Pulse

 

PIN DETAILS

Board has 3-pin connector for using the sensor. Details are marked on PCB.


Pin

Name

Details

1

GND

Power Supply Ground

2

+5V

Power supply Positive input

3

OUT

Active High Output

 

USING SENSOR

  • Connect regulated DC power supply of 5 Volts. Black wire is Ground, Next middle wire is Brown which is output and Red wire is positive supply. These wires are also marked on PCB.
  • To test sensor you only need power the sensor by connect two wires +5V and GND. You can leave the output wire as it is. When Eye closed LED is off the output is at 0V.
  • Put Eye blink sensor glass on the face within 15mm distance, and you can view the LED blinking on each Eye blink.
  • The output is active high for Eye close and can be given directly to microcontroller for interfacing applications.

EYE BLINK OUTPUT

5V (High)    →   LED ON When Eye is close.


0V (Low)   →   LED OFF when Eye is open.


WORKING

The exact functionality depends greatly on the positioning and aiming of the emitter and detector with respect to the eye. For example, a relatively robust detection of blinking is easy to achieve by arranging the detector so that it is near the eyelid, mounting the detector to the rubber eyecup of an HMD has this effect. Detection of saccadic eye motion is more difficult but is still easier than detection of absolute position, due to the characteristically rapid change in the light reflected from the eye surface during the saccadic jumps.




eye-motion


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