1. Prepared by:-
Harshil Solanki {20BEE011}
Vrinda Dadheech {20BEE033}
Vishal Gandhi {20BEE095D}
Pandit Deendayal Energy University
DEPARMENT OF ELECTRICAL ENGINEERING
Bidirectional Visitor Counter Circuit using 8051
Microcontroller
Group No. :- 09

2. Presentation Overview
• Introduction
• Objective
• Methodology
• Circuit Diagram
• Hardware and Software
• Advantages and Disadvantag
• Conclusion
• Reference

3. Introduction
• The main intention is to design a system where in the number of persons
entering or leaving a room is kept track of and diaplayed 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 presences of visitors and the
whole counting operation is done by a µc.

4. Objective
• With the help of this system we will be checking the number of people
entering and leaving from a particular confined area.
• This will help maintain the crowd during this pandemic, and in general as
well.
• If the visitor count crosses a certain number (defined by the system owner
or a by a default value), the display will show a message to try and alerat
the owner, so that necessary actions can be taken by him.

5. Methodology
• The circuit works on the principle of IR sensing. Infrared or simply IR
sensors are devices that work with Infrared Light Sources and a Photo
Detector like a photo Diode or a Photo Transistor that act as a
Transmitter and Recevier respectively.
• In this Project, we have used an IR LED as the IR Transmitter and a Photo
Diode as the IR Receiver. Two sets of IR Sensors consisting of an IR LED
and Photo Diode are placed at two ends of the entrance of a room.

6. Methodology (contd..)
• Output from each sensor is fed to the µC. In normal operation, IR light
from the LED would fall on the Photo Diode as it is a Reflective type IR
Sensor. The outut 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 Diode would stop receiving the IR Light. As a result, 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 µC
and accordingly the count would be increased or decreased.

7. Transmitter 1 Receiver 1
Transmitter 2 Receiver 2
Microcontr-
oller
EXIT
ENTRY
D0-D7
Methodology (contd..)

8. Circuit Diagram (Proteus)

9. Hardware and Software
• AT89C51 (8051 based µC)
• 8051 Programmer
• Push Button
• 10 µF Electrolytic capacitor
• 2 x 10KΩ Resistor (1/4 watt)
• 11.0592 MHz Crystal
• 16 x 2 LCD Display
• 10KΩ Potentiometer
• 2 x IR Sensors (Reflective Type)
• Connecting Wires & Power Supply
• Keil µ Vision Software (for codes)
• Proteus (for circuit making)

10. Advantages and DisadvantagE
• Provide information to management on the volume and flow of people
throughout a location. Human-based data collection comes at great
expense.
• No. ssd and ic we can add for higher counting.
• Low-cost microprocessor based visitor counter is easy to build.
• It can't work as both Entry and Exit.  Disadvantage

11. Conclusion
• Can be used in Shops and other confined public areas to count the
number of people entering and leaving a building.
• This will help control the crowd inside to ensure practical social distancing
during the pandemic.
• We just took up this project as we were interested in electronics and
wanted to learn about it. Through this project, we learnt a lot about the
functioning and use of different electronic components and their
applications in real life. we were able to correlate what is studied in our
course to real life.

12. Reference
https://core.ac.uk/download/pdf/234645128.pdf
https://www.electronicshub.org/bidirectional-visitor-counter-using-
8051-microcontroller/
https://myengineeringprojects.in/bidirectional-visitor-counter/
https://www.engineersgarage.com/automatic-bidirectional-visitor-
counter-using-8051-microcontroller-at89c51/