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Automatic Room Light Controller with
Visitor Counter
BYK. Immanuel (Roll No. 2011273009)
C. Jaganathan(Roll No. 2011273010)
ME - Applied Electronics (PT)
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Objective
To implement an automatic room light controller that automatically
makes glow the light when there is at least one person in the room.
Also this setup has an embedded LCD display module that displays
the visitor count in the room.
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Sections of the Project Power Supply
Sensor Setup
Microcontroller
LCD Display
Light Section
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Block Diagram
Microcontroller
Section
LCD Display
Power Supply
IR Trans-receiverSection
Light Control
Section
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Working Two IR LED & Photo-diode sensors are implemented at the entrance
of the room to sense the entry or exit of a person.
According to the action sensed the visitor count is increased or
decreased.
For counts greater than zero the light switches ON and the visitor
count reaches zero the light is switched OFF
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Power SupplyA Switch Mode Power Supply (SMPS) is used to convert 220v AC
supply into 5v DC suitable for the operation of the microcontroller.
The 5v DC supply is given as the Vcc and all the components of the
project, work in the 0-5v scale.
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Sensor Setup Two IR-LEDs act as transmitters and two photo-diodes act as
receivers.
The received sources are given to comparator for deciding whether
the light source is obstructed. first followed by Source 2 the action
sensed is incoming of a person.
Whenever Source 2 is obstructed first followed by Source 1 the
action sensed is outgoing of a person
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Sensor Setup LM 358
This is a comparator IC
This IC has two comparators
Two inputs and an output for each comparator
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Microcontroller
Atmel 89S52 microcontroller is used
The light controller is interfaced with Port 0
The sensor setup is interfaced with Port 1
The command/data-lines of the LCD module is interfaced with Port 2
The control-lines of the LCD module is interfaced with Port 3
Crystal Oscillator producing 11.0592 Mhz is used
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Microcontroller
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LCD Display Module 2 X 16 LCD Display is used
This LCD module has two line display each line is capable of
displaying 16 characters
8 command/data lines are available for sending command words or
data to be displayed in the LCD module
3 Control lines are available for performing operations like read/
write, reset, enable etc.
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Light Control In the prototype model a bright white high wattage LED is used as
the room light in order to make the kit portable
A transistor BC 547 is used to drive the glowing of the LED and also
cater to the current requirement for the LED
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Circuit Diagram
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Tools used Keil C Compiler
Progisp burning software
ISP, AT series USB burner kit
Languages Used: Embedded C.
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Advantages Saves current by switching OFF the light when no one is present in
the room
Displays number of persons inside the room at any time
Also gives information of total number of visitors who entered the
room
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