1. Mini Project Onkar Deshmukh Sarang Gadhave Sheshanarayan Dhakane
Group :
Onkar Deshmukh
Sarang Gadhave
Sheshanarayan Dhakane
Ankush Jaybhaye

2. Visitor Counter And Automatic Room Power Control

3. Introduction
In todays world there is great need of automating the things. As the world has become faster and closer, the SMART work is always appretiated.
So here we have made an attempt be the instrument for such a particular kind of need
“Visitor Counter and Automatic Room Power Control ”

4. Objectives
 The objective of the project is to prepare a system which will
Count the number of persons entering the room.
Count the number of persons leaving the room.
Switch OFF the Power if no one inside the Room.
Switch ON the Power Suppy even if a single person is inside the Room.

5. Assumptions There is only one door for enter and exit.
Two persons cannot enter simultaneously
As the ‘ir sensors’ are used it can count the object as well as the persons. But in our case we assume that only persons are entering the room.

6. Block Diagram

7. Block Diagram Description
This system basically consist of
two Ir sensors ,
one lcd 16x2,
2 relay,
a led interfaced with microcontroller 89s52.
In this system, one Ir sensor is used to count the number of people getting in to the room , which is placed at the entrance . Other Ir sensor is used to count number of people going out of room and is placed at the exit of the room.
With each person getting inside the complex, the Ir1 sensor will increase the number of count indicating the number of people present inside the complex at the respective time period.
With each person going out of the complex, the Ir2 sensor will decrease the count, maintaining the present strength of the people inside complex.
With each count the relay will switch on the Power and supply will start. Lcd is used to show the count value of the present human beings.

8. Switch OFF Power Supply
Operation Flowchart
start
microcontroller
Enter Sensor
Exit Sensor
Check if count=1
Check if count=0
Yes No
Yes No
Switch ON Power Supply
No Change
Switch OFF Power Supply
No Change

9. Circuit Diagram

10. PROGRAM LOGIC DESCRIPTION
Enter:
As per the program logic (downloaded in the microcontroller), when the first person enters the room the IR 1 detects it.
Then the person passes through the IR2 sensor which detects it.
The microcontroller checks whether it is first detected by IR1. If yes then increment the count by 1.
If no then it remains in the loop and no change.

11. Program Logic Description
Exit
As per the program logic (downloaded in the microcontroller), when the first person Exits the room the IR 2 detects it.
Then the person passes through IR1 sensor which detects it.
The microcontroller checks whether it was first detected by IR2. If yes then decrement the count by 1.
If no then it remains in loop and no change.
Power Supply Switching
When the first person enters the room immediately the count increases by 1(initially 0). Thus the command goes to the microcontroller to switch ON the Relay. Thus the Relay controls the main Power Supply Switch.
Similarly,
When all the persons inside the room Exit or if no one is in the room(i.e count=0) then the microcontroller again gives the command to the Relay to switch OFF. 
Thus the objectives of the project are satisfied.

12. Component
Specification
Qty
Rate
Cost
( Rs.)
(Rs.)
Diodes
1N4007 4 8
Microcontroller
AT 89c52 1 70
Capacitors
33pf ceramic 5
0.5
4.5 -
104 ceramic
103 ceramic
Resistors 15 20
Crystal
Mhz 2 16
Connectors(32pins) 32
Ir sensors
5cm range 25 50
mountings
40 pin 10
heat sinks
4*3
PCB 3
350
Multistrand Wire
2 meters
9/meter 18
Voltage Regulator
7805
Relay
12 Vdc 30
120
LCD
16*2
180
Transformer
15 Vac , 500ma 80
Regulator
Relimate
2 pin
4 pin
Tie Cables
8 cm
1 pack
Out fittings
chassy,nuts,
270
Bolts, screws.
TOTAL COST
1378/-

13. APPLICATIONS, ADVANTAGES & DISADVANTAGES
For counting purposes
For automatic room light control
Advantages
Low cost
Easy to use
Implement in single door
Automation and no requirement of separate monitoring
Disadvantages
It is used only when one single person cuts the rays of the sensor hence it cannot be used when two person cross simultaneously.

14. Looking into the Future
By using this circuit and proper power supply we can implement various applications
Such as fans, tube lights, etc. 
By modifying this circuit and using two relays we can achieve a task of opening and closing the door.

15. The End
Thank You