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GSM based Automatic Meter Reading
Abstract :
GSM based Automatic meter reading is the technology of
automatically collecting data fromenergy meter and transferring
that data to a central database for billing and/or analyzing.
The
Transmitter circuit is connected to the meter which counts the
pulses from it and displays it over
the LCD display. The transmitter circuit containing a GSM modem
for data transforming, which
transforms the meter reading after each 10 pulses to a
particular number through SMS.
An additional advanced service is also available, which includes
the software operating on the
computer. This software shows the updated reading. User has to
put the unit rate and date of
billing, and then this software automatically calculates the
bill and also print it if printer is
connected to computer.Main Circuit Diagram :
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Working:
In this GSM based Automatic meter reading, a led is connected in
parallel to the cal led of
meter reading. This led is paired with a LDR, which acts as an
optocoupler. the output of LDR isconnected to the base of NPN
transistor and the collector output of transistor is connected to
the
pin P1.0 of micro-controller. So at each blink of led of meter
reading, a signal is passed to the
micro-controller to count the pulses of meter reading. Then
micro-controller updates the reading
and displayed it over LCD and also saves to the EEPROM. The LCD
and EEPROM are
connected to port 0 of micro-controller. For transferring the
data a GSM modem is used, which
sends SMS to the particular mobile number defined. The
micro-controller is programmed to send
the SMS after every 10 pulses of meter reading. The MAX232 is
used to interfacing GSM
modem, there is another GSM modem is also available which doesnt
required MAX232, it can
directly connected to microcontroller.
