ZIGBEE BASED TWO WAY WIRELESS
CHAT TING SYSTEM
Under Extreme Guidance of
To generate signal in No-signal area.
Wireless transmission of data between two devices.
Over come the draw backs of Bluetooth, wifi.
To perform high level communication.
It’s highly preferable in rural areas.
ZigBee is the name of a specification for a suite of high level
communication protocols using small, low-power digital
radios based on the IEEE 802.15.4 standard for wireless
personal area networks (WPANs).
Can be used globally
Reliable and self healing
Supports large number of nodes
Easy to deploy
Very long battery life
PEER-TO-PEER DATA TRANSFER:
The devices are free to communicate with any other device
within their communication range.
In a peer-to-peer PAN the devices can “either receive
constantly or synchronize with each other.”
If they are receiving constantly, to transmit data they use unslotted CSMA-CA. In the second case, synchronization must
be achieved first.
AT89S52 MICRO CONTROLLER:
We are using an AT89S52 microcontroller for this project.
Atmel AT89S52 is a powerful microcontroller which provides a
highly-flexible and cost-effective solution to many embedded control
It is programmable compatible with 8051 Micro Controller and also
belongs to 8051 Micro Controller
REGULATED POWER SUPPLY:
Transformers convert AC
electricity from one voltage to another
with little loss of power. Step-up
transformers increase voltage, step-down
transformers reduce voltage. Most power
supplies use a step-down transformer to
reduce the dangerously high mains
voltage (220V) to a safer low voltage.
The input coil is called the primary and
the output coil is called the secondary.
These coils are linked by an alternating
magnetic field created in the soft-iron
core of the transformer.
A regulated power supply is one that controls the output
voltage or current to a specific value;
the controlled value is held nearly constant despite variations
in either load current or the voltage supplied by the power
supply's energy source
Voltage regulator ICs are available with
fixed (typically 5, 12 and 15V) or
variable output voltages. They are also
rated by the maximum.
Objective : To prepare a 5 Volt DC
supply for further lab use with TTL
TTL – “Transistor Logic” Chips requiring
5 Volt of DC power input current they
LIQUID CRYSTAL DISPLAY:
LCD Panel is based on
A light valve for each pixel that
turn the light on, off, or an
Grid of such light valve for the LCD
A back light and display enhancement
films create the illumination.
R/W = 0 → Write ,
R/W = 1
E – Enable
Used to latch the data present
on the data pins.
D0 – D7
Alphanumeric characters are
sent in ASCII format.
Data Transfer Between Two Devices.
In Digital Libraries.
For Communication In Rural Areas.
Our project is designed mainly for communication between
two devices and enjoy the high-quality wireless
Further scope for this project is improvising the security of