WIRELESS DIGITAL CODE
LOCK WITH A STATUS
DISPLAY
DONE AT K A INSPIRE SOFTWARE SOLUTIONS
INDIVIDUAL PROJECT
BY
R.KARTHIKMANOJ
31106106037
PROJECT DESCRIPTION
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In my project “Wireless Digital Code Lock with a
Status Display” is used to protect the efficient hacking
prevent from brute force etc.
The basic user lock is of 4 Digits and Master lock is of
1 digit so it’s not easy for an intruder to break the lock
unless you keep the code simple.
The input is taken from a 4x3 Keypad
The user input is displayed on a 2x16 LCD
A pin is assigned as output for activating and
deactivating the lock.
For demonstration i have connected an LED to that pin.
HARDWARE REQUIREMENTS
MICROCONTROLLER(AT89S51) UNIT
 POWER SUPPLY
 KEYPAD UNIT
 BUZZER UNIT
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SOFTWARE REQUIREMENTS
EMBEDDED C
 KEIL COMPILER
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SOFTWARE IMPLEMENTATION
The software used for this project is KEIL,
FLASH Programmer, OrCAD and Visual
Basic6.0.
 Keil is used to develop the program for
AT89S51 microcontroller.
 Flash programmer is used to download the
program into the AT89S51 microcontroller.
 OrCAD software is used to design the PCB
layout.
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BLOCK DIAGRAM:
TRANSMITTER SECTION
BLOCK DIAGRAM:
RECIEVER SECTION
CIRCUIT DIAGRAM
MICROCONTROLLER
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The AT89S52 is a low-power, highperformance CMOS 8-bit microcontroller
with 8K bytes of in-system programmable
Flash memory.
POWER SUPPLY
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Power supply is a reference to a source of
electrical power. A device or system that
supplies electrical or other types of energy
to an output load or group of loads is
called a power supply unit or PSU.
STEP DOWN TRANSFORMER
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The transformer is transferring the
electrical voltage or current from one
circuit into another circuit without
changing the frequency. When (0-220V)
AC is applied at the primary winding, it will
step down the power supply voltage and
given as(0-6V) AC in the secondary
winding as an output.
ENCODER (HT12E)
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The 212 encoders are a series of CMOS
LSIs for remote control system
applications. They are capable of encoding
information which consists of N address
bits and 12_N data bits.
DECODER (HT12D)
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The 212 decoders are a series of CMOS LSIs for remote
control system applications. They are paired with
Holtek_s 212 series of encoders.
The decoders receive serial addresses and data from a
programmed 212 series of encoders that are transmitted
by a carrier using an RF or an IR transmission medium.
TRANSMITTER MODULE (STT433)
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The transmitter operates from a 1.5-12V supply,
making it ideal for battery-powered applications.
The transmitter employs a SAW-stabilized
oscillator, ensuring accurate frequency control
for best range performance.
RECEIVER MODULE (STR433)
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The STR-433 is ideal for short-range
remote control applications where cost is a
primary concern. The receiver module
requires no external RF components
except for the antenna.
LCD DISPLAY (16x2)
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LCD module have 8-bit data interface and
control pins. One can send data as 8-bit or in
pair of two 4-bit nibbles.To display any character
on LCD micro controller has to send its ASCII
value to the data bus of LCD. LCD display used
here is having 16x2 size. It means 2 lines each
with 16 character.
KEYPAD SWITCHES
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The key board here we are interfacing is a
matrix keyboard. This key board is designed
with a particular rows and columns. These rows
and columns are connected to the
microcontroller through its ports of the micro
controller 8051. We normally use 8*8 matrix key
board.
BUZZER
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Buzzer is an electromagnet that
automatically connects and disconnects
many times per minute. This will cause
the vibration of the armature and creation
of a buzzing sound.
APPLICATIONS
It’s used to prevent from hacking.
 It can be used in any device.
 It protects any device and is very secured.
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