The aim of this project is to develop a system for wireless message communication between two computers using 2.4 GHz trans-receiver units.In offices, communication between employees is essential. This project uses a pair of 2.4 GHz transceiver modules duly powered by 5 volt DC and alarm circuits.They are used for bidirectional real time chat communication from one PC to another wirelessly using hyper terminal.

1. Wireless Message Communication
between Two Computers

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Wireless Message Communication between
Two Computers
Introduction
 The aim of this project is to develop a system for wireless message communication
between two computers using 2.4 GHz trans-receiver units.
 In offices, communication between employees is essential.
 This project uses a pair of 2.4 GHz transceiver modules duly powered by 5 volt DC and
alarm circuits.
 They are used for bidirectional real time chat communication from one PC to another
wirelessly using hyper terminal.

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Wireless Message Communication between
Two Computers
Description
 the user attempts to initiate a chat, intimation upon that message is received first by a
buzzer sound.
 There after the other user can start communicating over the chat mode from his PC.
 A pair of transceiver modules are connected to the PCs using a DB9 (De-Sub) connector
and through serial data cord using RS232 protocol communication between the module
and the PC.
 An on-board dedicated ac to dc power supply is used at both ends to power the units.

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Wireless Message Communication between
Two Computers
Block Diagram

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Wireless Message Communication between
Two Computers
Hardware Requirements
 2.4GHz transceiver
 Resistors
 Capacitors
 Diodes
 Transformer
 Voltage Regulators
 555 timers
 Transistor
 Buzzer

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Wireless Message Communication between
Two Computers
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.

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Wireless Message Communication between
Two Computers
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).

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Wireless Message Communication between
Two Computers
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 resistors on a silicon chip installed in an 8-pin mini dual-
in-line package (DIP-8)

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Wireless Message Communication between
Two Computers
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

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Wireless Message Communication between
Two Computers
Pc Communication

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Wireless Message Communication between
Two Computers
 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.

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Wireless Message Communication between
Two Computers
Future Scope
 This concept in future can be further enhanced to link more number of systems
forming a network.
 To dedicated computers such that number of employees can communicate with each
other.
 Wireless message communication between two computers works only on operating
systems having hyper terminal (E.g. Windows XP). The computer must have a RS232
serial port.

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