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
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
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
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
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.