literature review for bidirectional visitor counter
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literature review on bidirectional visitor counter from ieee papers
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literature review for bidirectional visitor counter

This article describes the design and working of a bidirectional visitor counter. The main intention is to design a system wherein the number of persons entering or leaving a room is displayed on a screen. When a person enters the room, count would be increased, whereas on leaving, the count would decrease. IR sensing mechanism is used to sense the presence of visitors and the whole counting operation is done by a microcontroller. But, before going to know about this circuit, get an idea about how to interface a 7 segment LED Display to 8051 Microcontroller as we use use this concept in this project.

Bidirectional Visitor Counter Circuit Principle:

The circuit works on the principle of IR sensing. Two sets of IR sensors consisting of an IR LED and photo transistor are placed at two ends. Output from each sensor is fed to the microcontroller. In normal operation, IR light from the LED would fall on the photo transistor and the latter would conduct. The output from the sensor would be a logic low signal in this case. In case of any interruption (due to any person crossing the path), the photo transistor would cease to conduct or conduct less and the output from the sensor would be a logic high signal. The transition from low to high, for each sensor pair is detected by the microcontroller and accordingly the count would be increased or decreased.

This is a good Electronics project report on Microcontroller based bidirectional visitor counter and is designed and presented in order to count the visitors of an auditorium, hall, offices, malls, sports venue, etc. The system counts both the entering and exiting visitor of the auditorium or hall or other place, where it is placed. The report includes the block diagram, working of the project, circuit diagram etc. You can also Subscribe to FINAL YEAR PROJECT'S by Email for more such Projects and Seminar.


Depending upon the signal from the sensors, this project detects the entry and exit of the visitor. On the successful implementation of the visitor counter, it displays the number of visitor present in the auditorium or hall. This system can be economically implemented in all the places where the visitors have to be counted and controlled. Since counting the visitors helps to maximize the efficiency and effectiveness of employees, floor area and sales potential of an organization, etc.

The circuit shows the microcontroller based bidirectional visitor counter, wherein the transmitter and the receiver form the IR detection circuit. Control logic is built around transistors, operational amplifier LM324 (IC1) and flip-flop (IC2).


The program coding for this bidirectional visitor counter circuit is written in ‘C’ language and is compiled using C51 Keil compiler and is given in this report for your reference. The circuit may also be enhanced with a wide counting range of above three digits by modifying software section of the system. It can also be enhanced for long and accurate sensing range using a laser torch instead of IR transmission circuit. Thus the circuit can be used to monitor visitor flow in effective manner, where the visitors have to counted and controlled.
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