be small enough to be fixed inside a switch board. High
speed Power Line modems could be used for last mile
broadband connectivity.
•
Implementation of PLC-Zigbee Hybrid combination
could further enhance the functionality of the system.
VIII. R
ESULTS AND CONCLUSION
The system was tested using a Power Line transmitter
and two receivers connected to appliances kept at different
locations but within the same electric network. The appliances
were controlled by sending specific commands to trigger the
relays which were the switch link in the circuit. The signals
do not get transmitted through the MCB so the signals sent
from one house don’t interfere with that of the neighbor’s.
The response to commands sent by the iPod interface had a
lag of 0.6 to 1 second.
Some of the challenges faced during the course of imple-
mentation of the system.
•
Porting the decoding program of OSC messages onto the
microcontroller.
•
Reliability of Power Line communication system
•
To improve the reliability of data reaching the end re-
ceiver redundancy was introduced by sending the data
twice from the Power Line transmitter.
•
The noise on the Power Line and interference if beyond
a threshold could corrupt the data being transmitted on
the Power Line.
•
The range of control primarily depends upon the range
of the Wi-Fi router as the range of the PLC modem has
been validated to be 300m in a straight-line environment.
The system was extensively tested for various conditions/cases
such as AC power, UPS and no power and practical conditions
were simulated artificially; for example resetting automatically
from no power state. The system uses Power Line as a physical
media for communication so in spite of no activity on the
Power Line data was being transferred reliably.
R
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6
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