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ROOM LIGHT CONTROLLER WITH VISITOR COUNTER

Submitted by

I NTRODUCTION

This Project “Automatic Room Light Controller with Visitor

Counter using Microcontroller” is a reliable circuit that takes

over the task of controlling the room lights as well us counting

number of persons/ visitors in the room very accurately. When

somebody enters into the room then the counter is incremented

by one and the light in the room will be switched ON and when

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. The microcontroller

does the above job. It receives the signals from the sensors, and

this signal is operated under the control of software which is

stored in ROM. Microcontroller AT89S52 continuously monitor

the Infrared Receivers, When any object pass through the IR

Receiver's then the IR Rays falling on the receivers are

obstructed this obstruction is sensed by the Microcontroller.

MAIN COMPONENT1. 8051 Microcontroller

2. Relay

3. Ir sensor pair

4. Op amp

5. Power Supply

BLOCK DIAGRAM

8051 MICROCONT

ROLLER

LCD

POWER SUPPLY

OPAMP

RELAY

IR SENSOR

PAIR

A BRIEF INTRODUCTION TO 8051

MICROCONTROLLER

When we have to learn about a new computer we have to

familiarize about the machine capability we are using, and we

can do it by studying the internal hardware design (devices

architecture), and also to know about the size, number and the

size of the registers.

A microcontroller is a single chip that contains the processor

(the CPU), non-volatile memory for the program (ROM or

flash), volatile memory for input and output (RAM), a clock and

an I/O control unit. Also called a "computer on a chip," billions

of microcontroller units (MCUs) are embedded each year in a

myriad of products from toys to appliances to automobiles. For

example, a single vehicle can use 70 or more microcontrollers.