The
main aim of this project is to control the devices in a wireless way
and to eliminate the manual operation upto maximum extent i.e., the
devices should be controlled by the user even when the user is far away
from the devices. This project does this application using wireless
concept. One of wireless communication system is Zigbee communication
system as it is cheap and very easy to implement.
The
home appliances can be switched on/off using this Zigbee Technology
without actually going near the switch boards or regulators. The loads
like lights, motors, heaters, power controlling system and also current
through the loads can be controlled in this project. We can control all
loads at a time from one place (control room) without connecting any
physical wire between loads and control room.
Six
push-to-on switches are provided to switch on/off different electrical
loads. One more push-to-on switch is provided to vary the speed level of
the fan or a motor. The seven switches are interfaced to the Zigbee
module at the transmitter section. The module continuously reads the
status of the switches and transmits the data.
At
the receiving end, the Zigbee receiver receives this data and presents
it to the microcontroller. Now, it is the job of the controller to read
the data and perform the corresponding action i.e., switch on/off
corresponding load or vary the speed according to the user requirement.
Since
AC loads are also controlled in this project and the microcontroller
cannot handle AC loads, TRIAC is used to control the AC loads. The speed
of AC motor can be varied rapidly on and off by TRIAC. The main
advantage of using a TRIAC to vary the speed of an AC motor is the TRIAC
reduces the energy flow to the motor and TRIAC works very well for
alternating currents.
BLOCK DIAGRAM
Transmitter Section
Receiver Section
