LIFI COMMUNICATION
PIC
What
if light could beside just illuminate, also send streams of data? all of a
sudden daily lighting, like traffic light, television sets, headlight and other
lamps ,become far more important .we could have streetlights sensing maps to
navigation systems for example or create an ad hoc network using office light.
At
the heart of this technology, a new generation of high-brightness
light-emitting diodes. Very simply, if the LED is ON, user can transmit a
digital string of 1, if it’s OFF then user can transmit a string of 0. It can
be switched ON and OFF very quickly, which gives instant opportunity for
transmitting data. It is possible to encode data in the light by varying
the rate at which the LEDs flicker ON and OFF to pass different strings of 1s
and 0s. The modulation is so fast that the human eye doesn’t notice. There are
over 14 billion light bulbs used across the world, which needs to be
replaced with LEDs ones that transmit data.
BLOCK DIAGRAM:
WORKING PRINCIPLE:
The light intensity can be manipulated to send data by tiny
changes in amplitude. This technology uses visible spectrum of light ,a part of
the electromagnetic spectrum that is still not greatly utilized. In fact the
technology transfers thousands of streams of data simultaneously, in parallel,
in higher speeds with the help of special modulation, using a unique signal
processing technology. As shown in the above block diagram,
It
consist of transmitter section and receiving section. Here by means of light we
are transmitting streams of data. The Transmitter section transmit the data
that we type from our pc through LED. This LED can transmit data serially at
the baud rate 57600. This data is received serially by the receiver section and
that data is displayed in the receiver section PC through serial to USB. The
data is received only when receiver section is in the range of transmitter
section as a result this system is highly secure.
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