1. WIRELESS NETWORKING OF
DEDICATED COMPUTERS
Under the Guidance of
Submitted by

2. ABSTRACT
The term wireless networking refers to technology that enables two or more computers to communicate using standard network protocols, but without network cabling.
In this project we use a pair of 2.4 GHz transreceiver modules used for bidirectional chat communication from one PC to another wirelessly.
A 555 timer is used in monostable mode which drivers a buzzer to indicate that a data is received on PC drawing the attention to respond to the caller.

3. BLOCK DIAGRAM

4. HARDWARE REQUIREMENTS
TRANSFORMER (230 – 12 V AC)
VOLTAGE REGULATOR (LM 7805)
RECTIFIER
FILTER
TRANSRECEIVER MODULE
555 TIMER
BC547
BUZZER
MAX232
IN4007
LED
RESISTORS
CAPACITORS

5. POWER SUPPLY Bridge rectifier 5v Regulator 230 V AC 50 Hz 5V DC
Filter(470µf)
12V step down
transformer

6. MAX 232
The MAX232 is an integrated circuit that converts signals from an RS-232serial port to signals suitable for use in TTL compatible digital logic circuits.
The MAX232 is a dual driver/receiver and typically converts the RX, TX, CTS and RTS signals .
When a MAX232 IC receives a TTL level to convert, it changes a TTL Logic 0 to
between +3 and +15V, and changes TTL
Logic 1 to between -3 to -15V, and vice
versa for converting from RS232 to TTL.

7. DB9 CONNECTOR
The DB9 (originally DE-9) connector is an analog 9-pin plug of the D-Sub miniature connector family (D-Sub or Sub-D).

8. 555 TIMER
The 555 Timer IC is an integrated circuit (chip) implementing a variety of timer and multivibrator applications.
The original name was the SE555 (metal can)/NE555 (plastic DIP) and the part was described as "The IC Time Machine".
Depending on the manufacturer, the standard 555 package includes over 20 transistors, 2 diodes and 15 resistorson a silicon chip installed in an 8-pin mini dual-in-line package (DIP-8)

9. PIN DIAGRAM OF 555 The 555 timer IC is a simple 8 pin DIL package IC.
It can:
be used as a monostable
be used as an astable
source or sink 100mA
use supply voltages of 5v to 15v
disrupt the power supply - use a decoupling
capacitor!

10. PC COMMUNICATION

11. Plug-and-communicate (no configuration required)
Transparent operation supports existing software & systems
Simple configuration using software & standard AT commands
Retries & acknowledgements for guaranteed packet delivery
RS-232/422/485 protocol & multi-drop bus support
Peer-to-peer, point-to-point & point-to-multipoint networks

12. THANK ‘Q’