Within a distance of 30 meters the data can be trasmitted or can be recieved using radio frequency range with wireless manner.

1. WIRELESS
NOTICE BOARD
USING RF
BY
S.ROHIT SAGAR

2.  Now a days Electronic communication plays a
vital role in our day to day life.
 Our project deals with wireless notice board
using rf.

3.  To overcome the drawbacks from messy
wired notice boards; we are using wireless
notice board.
 With this project recruiting of a person for
maintaince of notice board can be avoided.

4. AT89S52
MICRO
CONTROLLER
AT89S52
MICRO
CONTROLLER
Regulated
Power supply
LCD 2*16
Regulated
Power
Supply
RF Receiver
module
MAX232
RF
Transmitter
module
PS/2
KEYBOARD
TRANSMITTER RECEIVER
BLOCK DIAGRAM

6.  AT89S52
 LCD
 RF MODULE
 MAX 232

7. START
INITIALIZE
MICROCONTROLLER
INITIALIZE RF TRANSMITTER
MODULE
INITIALIZE SWITCHES
Read input from key board
IF ANY
DATA
IS
PRES
SED
RF TRANSMITS SPECIFIED
DATA T0 RECEIVER BY
ENCODER
STOP
NO
YES
TRANSMITTING SECTION : FLOW CHART

8. START
INITIALIZE MICROCONTROLLER
INITIALIZE RF RECEIVER
MODULE
DATA TRANSMITTED BY RF
TRANSMITER IS DECODED
DECODED DATA IS GIVEN TO
MICROCONTROLLER
DISPLAY DATA ON LCD
STOP
RECEIVING SECTION:

9. • 4K Bytes of In-System Reprogrammable
Flash Memory
• 256 x 8-bit Internal RAM
• 32 Programmable I/O Lines
• Three 16-bit Timer/Counters
• Eight Interrupt Sources

10.  At the time when data is transferred from the
transmitter a predefined code will be Added
with every eight bit data from HT12E ic chip .
 when this data receive by the receiver this
code will be decode by the receiver and
generate the exact data that will be displayed
On LCD.

11. Liquid Crystal Display also called as LCD is very
helpful in providing user interface as well as
for debugging purpose.
The most common type of LCD controller is
HITACHI 44780 which provides a simple
interface between the controller & an LCD.

12.  Introduction:Wireless Transmitter Modules
allow your chip to wirelessly communicate
with chip, or with radio frequency
(RF) controlled devices that operate in the
same frequency (433Mhz in this case).
 They work in pairs, meaning you need both a
receiver and a transmitter to communicate
with each other.
The transmitter has 4 pins: GND (Ground),
VCC (5V),antenna pin and one DATA pin.

13. ADVANTAGES:
 1. Low cost
 2. Less complex
 3.This technology can not depends upon
network.
DIS ADVANTAGE:
 1. This technology can be used only very
shorter distance

14.  This method can be used in transportation
applications.
 Medical applications.
 Waiting room.
 Colleges.
 Restuarents.

15.  The project “WIRELESS DATA
COMMUNICATION USING RF” has been
successfully designed and tested.
 Secondly, using highly advanced IC’s and with
the help of growing technology the project
has been successfully implemented.

16.  In future ZIGBEE communication can be used
in replace RF communication. Because of
ZIGBEE communicating the more distance and
also it is two way communication.
 In ZIGBEE communication a data can be
received by multiple receivers.
 Encryption is any procedure to convert
plaintext into Cipher text and Decryption is
any procedure to convert cipher text into
plaintext