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CHAPTER IX

  RESULTS

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  Introduction

The LiFi transmitter and receiver prototype has been designed. For sign board to vehicle and

vehicle to vehicle communication, audio message is transmitted through light and arm controlleris used to control the speed of the vehicle .The various results are shown in snapshot.

DTMF ENCODER UM95089IC

The Ipc214 understands the commands and sends it to !T"F tone generator #"$%&$ I'

which generates

(n e)uivalent tone fre)uencies for the particular pressed radio button using !T"F signaling. (

*ey is pressed and the microcontroller will generate bits accordingly. These are converted into

 particular fre)uency by the !T"F encoder, this signal is further amplified using lm+41 i.e., pre

and power amplifier stages in the transmitter part that amplifies both current and voltage

sufficiently as shown in fig 4.

Li-Fi trn!"itt#r

The prototype demonstrate that device control and data transmission can be achieved through

visible light with speeds up to 1mbps. The transmitter uses a low power cost, low power led

which consumes 1 watt, the prototype effectively transmits bits of data. The varied amplified

signal is converted into light energy by the amplifier stage which then drives the power L! as

shown in fig%.

The range of transmission has been tested to be -1& feet indoor in a low to medium illuminated

room and up to 2 feet in bright sun light .thus it can be said that depending on the number of

 power leds that are used, the range of transmission is limited to the range .It depends on the

sensitivity of the receiver sensor that is used.

LPC $%&8 contro''#r!

The server decodes the commands coming from the client and passes them on to the Li-Fi

transmitter controller L'214.

It controls the speed of the vehicle.

 

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Li-Fi R#c#i(#r

(t the receiver part the L!/ receives the transmitted light and converted to e)uivalent

lectrical signal is further amplified using lm0% and lm0 current and voltage sufficiently.

(mplification stage which boost the signal and fed to !T"F decoder "T+& I'.

DTMF D#cod#r MT88)0

!T"F decoder intercepts the fre)uency modulated signals to obtain !T"F tones.

The !T"F signals are received and decoded using a receiverdecoder I' "T+&.

!T"F signal is converted to 3'! by the !T"F decoder circuit"T +&5 in the shown

Figure.,4 bit binary and transmitted bits are recovered.Four 3'! outputs

 obtained from the !T"F receiverdecoder I' corresponding to each digit are

 connected to /elays ,whose output is used to control the lectrical appliances

through relays.These bits are used by the microcontroller to control the

6ternal device operating at 20&7.

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