Wireless Message Communication Between Two Computers

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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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