ABSTRACT
We are going to make WIRELESS DATA TRANSFER USING PIC(Peripheral
Interface Controller).The PIC18F4620 is a product of microchip. It is 8-bit
controller and specially designed for ultra-low-power applications. A flexible
clocking system multiple operating modes and Brown-Out Reset (BOR) are
implemented to reduce power consumption and dramatically extend battery life.
The data will be transmitted and received by using ZigBee transceiver module
(MRF24J40MA).It is 2.4 GHz IEEE Std. 802.15.4™RF Transceiver Module .The input
will be given from transmitter side by Three sets of switches and each set
contains three push button switches .And the output at the receiver side will
be displayed on computer. This device can be applicable for the following
applications:
l
Reviewing
public pole
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EVM
(Electronic Voting Machine)
l
Quiz
contest.
Need for Wireless Communication
Our
interest in the wireless is only because the world is moving towards
sophistication and the interest in the field of wireless has tremendously
increased in the last few years, and being a communication engineer it relates
to our field and also to our interest. The use of wireless also gives us
freedom from the labor of laying the wires and also from the maintenance.
Although I must be the first one to admit that this idea is not always
welcomed. Especially in the companies where the controlling is extremely
critical and has to be maintained strictly. And the companies are not really
ready to take any chances with the wireless system. The term
"wireless" should not be confused with the term "cordless",
which is generally used to refer to powered electrical or electronic devices
that are able to operate from a portable power source (e.g. a battery pack)
without any cable or cord to limit the mobility of the cordless device through
a connection to the mains power supply. Some cordless devices, such as cordless
telephones, are also wireless in the sense that information is transferred from
the cordless telephone to the telephone's base unit via some type of wireless
communications link.
The ZigBee is a collection of companies that have teamed up to promote a wireless
communication standard based on
the IEEE 802.15.4 standard. The 802.15.4 specification
covers the PHY and MAC hardware, while ZigBee starts at the Media Access
Control (MAC) layer and adds a
Data Link layer, a Network Layer, and an Application
Interface. Thus, ZigBee encapsulates nearly the entire communication
process from the end user's application.
Using a dual physical layer, ZigBee offers the ability to use the 2.4 GHz
spectrum or the 868/915 MHz spectra. At 2.4GHz, the data rate starts at 250 kbps; at 915 MHz, the
data rate starts at 40 kbps; at
868 MHz, the data rate begins at 20kbps. As usual, these rates
will decrease as the distance between nodes increases. Its
range is from 5 to 500m
depending on the environment,
but typical performance is around 50m. This compares favorably to Bluetooth
while using a fraction of the power.
ZigBee systems are design with
power consumption in mind. A ZigBee system is rarely active. Typical duty cycle
for a system is about .01%. This means the system has an effective power
consumption of 30uW in
contrast to a active Bluetooth node which consumes about
30 mW of continuous power.
Reviewing Public Pole
Quiz Contest.
EVM [Electronic Voting Machine]
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