visitor counter by triveni mishra from itm gida and shreya srivastava

1.  Controlling the room lights as well as counting number
of persons/visitors in the room very accurately.
 Somebody enters into the room then the counter is
incremented by one and the light in the room will be
switched ON.
 Any one leaves the room then the counter is
decremented by one.
 The light will be only switched OFF until all the
persons in the room go out.
 The total number of persons inside the room is also
displayed on the seven segment displays.

2. Components
IC7805

4.  Bi Directional visitor counter system uses the logic of sensors.
 Infra Red Sensors are used to check if someone is entering or going to
outside.
 Here We are connecting the sensors in Through Beam Configuration.
 As a person enters the data will be incremented on Segment display and
when somebody is going to outside the data will decrement.
 And according to the value on display unit the appliances of room will be
controlled. For 0 value all appliances will be off and for less than 5 one
appliance will be on and for more than one 2 will be on.

6.  NE555 Timer IC
 LCD (16*2)
 Microcontroller ( AT89s52)
 Frequency Crystal (11.0592 MHz)
 Capacitors
 Voltage regulator (7805)
 IR Sensors(TSOP17)
 Relay
 Resistors 104,33pF

8.  The AT89C52 is a low-power, high-performance
CMOS 8-bit microcontroller with 8K bytes of in-
system programmable Flash memory.
 The device is manufactured using Atmel’s high
density non volatile memory technology and is
compatible with the Industry-standard
80C51instruction set and pin out.
 The on-chip Flash allows the program memory to be
reprogrammedin-system or by a conventional
nonvolatile memory pro- grammar. By combining a
versatile 8-bit CPU with in-system programmable
Flash on a monolithic chip, the
 Atmel AT89C52 is apowerful microcontroller which
provides a highly-flexible and cost-effective solution
to manyembedded control applications.

9.  1. 8 KB Reprogrammable flash.
 2. 32 Programmable I/O lines.
 3. 16 bit Timer/Counter—3.
 4. 8 Interrupt sources.
 5. Power range: 4V – 5.5V
 7. Fully static operation: 0 Hz to 33 MHz
 9. Power off flag
 11. Low power idle and power down modes
 12. Interrupt recovery from power down modes
 13. 256 KB internal RAM


10. Gather input from various sensors .
 Process this input into a set of actions .
 Use the output mechanisms on the
Microcontroller to do something usefull.

12. Pin Symbol I/O Description
1 Vs - Ground
2 Vcc - +5 V
3 VEE - Contrast control
4 RS I Register Select
5 R/W I Read/Write
6 E I/O Enable
7 DB0 I/O 8 bit data bus
8 DB1 I/O 8 bit data bus
9 DB2 I/O 8 bit data bus
10 DB3 I/O 8 bit data bus
11 DB4 I/O 8 bit data bus
12 DB5 I/O 8 bit data bus
13 DB6 I/O 8 bit data bus
14 DB7 I/O 8 bit data bus
11/3/2015 12Er. Mandeep Singh

13. 16X2 LCD Module
11/3/2015 13Er. Mandeep Singh

15. What is
relay?
A relay is a
automatic
device which
senses an
abnormal
condition of
electric circuit
and closes its
contacts

16.  There are really only two fundamentally
different operating principles,
1. Electromagnetic attraction
2. Electromagnetic induction
 Electromagnetic attraction relays operate by
virtue of a plunger being drawn into a solenoid.
 Electromagnetic induction relays use the
principle of the induction motor whereby
torque is developed by induction in a rotor.