AT89C51 Based Object or Visitor Counter using IR sensors and 2 Digit Seven Segment Display

AT89C51 Based Object or Visitor Counter  using IR sensors and 2 Digit Seven Segment Display

AT89C51 Based Object or Visitor Counter  using IR sensors and 2 Digit Seven Segment Display

Object counters or product counters are important applications used in industries on the conveyor belt to count number of objects passed, shopping malls as a visitor counter, to keep track of the number of visitors who have visited the Mall, etc. They count objects or products automatically and so reduce human efforts. 

Here we are introducing object counter using IR system in which IR sensors are used which senses any object that passes in front of it and gives output pulse to the counter and it increments count by one when it gets pulse input from sensor. Then Current count is displayed on any type of display like the 7-segment or LCD display.

Block diagram:

An IR sensor is an electronic instrument used to detect the objects. The IR LED continuously emits infrared rays and also receiving its rays back using the IR detector which comes back from being reflected back from the object. When any object comes in between IR sensor, the IR light gets reflected

This reflected light is detected by photo diode and it gives output pulse to the microcontroller then microcontroller will give single to counter to increments by one digit and it is displayed on 1^st 7-segment display As counter increments 0 to 9, the 1^stdisplay shows values 0 to 9.On next count 1^st counter gives pulse to 2^nd counter chip. So the 2^nd counter increments thus both counters can together counts from 0 to 99 as the objects pass in front of the sensor.

Hardware requirements:

·       8051 microcontroller

·       IR transistor

·       IR receiver

·       Voltage regulator

·       Power supply

·       7 segment display

·       2 digit counter circuit

·       LED/Buzzer

Software requirements:

    ·       MC Programming Language: Embedded C

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