Cell phone Based Speed Control of the Motor Now a day's
communication is a very important one, mainly cellular communication is an
emerging technology. By using cellular phone, we can do many wonders like
sending messages, e-mails even we can browse a website using a wap technology.
All the above parameters exist in the cellular service. We are going to control
electrical appliances like industrial motors with the help of a cellular phone
and a dot line.
Micro controller is a very essential one and almost available
in every industry. So we decided to control the electrical appliances by using
embedded c, there are two ways to control the appliances with micro controller.
The software can be developed with the help of embedded C language.
When you call your mobile from your cellular phone, the
mobile will be connected to a dtmf decoder with headset. Then the cellular
phone user has to press the number in his cell phone number pad. Then the
number will be converted in to DTMF (Dual Tone Multi Frequency) signal, which
is consists of a low frequency and high frequency waveform. Then that will be
transmitted to the land line side.
At the receiver end the DTMF signal will be detected and
decoded with the help of a DTMF decoder IC (8870). The DTMF decoder will
convert the DTMF waveform in to BCD format. The BCD output format will be given
to the micro controller through the interface circuit. Then the received BCD
data will be converted in to decimal format with the help of software. Then
according to the pressed number the Dac will get actuated. Then the DAC output
will be connected to control circuit and to the motor
BLOCK DIAGRAM:
TRANSMITTER:
RECEIVER:
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