The project works on the
principle of DTMF tone command so received from any phone to remotely switch
any electrical load such as agricultural pump, domestic and industrial loads
etc. In industries, the loads are spread over a large area and thus, operating
these loads is a very tiresome and difficult task. In agricultural fields also,
pumps and other loads are connected over a large area and hence it is difficult
for the farmer to operate all the loads and similarly for house hold loads. Keeping
these problems in mind, the proposed system has been designed which uses DTMF
technology to control the loads remotely.
A cell phone is interfaced
to a DTMF decoder in the system from its audio output socket for receiving tone
commands. The receiving cell phone codes are converted into digital commands by
using a DTMF Decoder which will identify the frequency of the key and convert
that frequency to its equivalent digital code which is then fed to a microcontroller
(8051 family). As per the commands sent from the sender’s mobile, the
microcontroller will send signals through a buffer to actuate the respective loads
by turning the relays ON/OFF. These relays are actuated by a relay driver IC
interfaced to the microcontroller.
Further this project can be
enhanced by using a GSM modem, where the loads can be controlled by sending an
SMS. This will eliminate the need of answering the call for the system to work.
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