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The DTMF based remote monitoring system consists of sensors for sensing the present
parameters of the process or machine. The whole system can be installed at a distance
place from where these data can be directly sent to the logging system. The data
obtained is sent to doctor’s system by converting it into DTMF signals. The DTMF
stands for dual tone multiple frequencies. The idea behind this project is generation
of DTMF signal for sending data. In communication any digit may be transmitted in
pulse mode or in DTMF mode. We are generating DTMF tones at transmitter end and
decoding these tones at receiving end which can be used for transmitting the data
from one end to another end.
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LIGHTING LOAD CONTROL USING GSM SYSTEM Electrical Engineering Project
Working:-
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DTMF decoder sends the information in the form of frequency from the 3G hand set
,Then DTMF decoder decode the information in the form of frequency and this information
fed Here microcontroller is the heart of this project ,Firstly the power supply
of 5v DC is very essential for this set up, this power supply trigger the microcontroller
8051,then 8051 is directly connected with LCD & device control, LCD gives the info
regarding devices that can be operated by microcontroller 8051 & device control
here acting as a switch with the help of relays .To microcontroller pins.Finally
microcontroller performs the relative operations.
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