PREPAID EMBEDDED ENERGY METER
Submitted By.SHANTANU CHATTERJEE
SURAJ SHARMATRISAB RAJ
SAORUB HALDER
GUIDED BY:Mr. DIBYENDU CHOWDHURY
ABSTRACT
The main objective of the project is to develop a prepaid
energy meter.
The microcontroller takes the reading from the energy
meter and displays the reading on the LCD. The reading of the
energy meter is also sent to the cell phone of the user by a
message through GSM module.
This project is powered by an on-board power supply
takes the ac power and converts it into dc power that is fed to
on-board devices and integrated circuits.
AGENDAOBJECTIVEBLOCK DIAGRAMDESIGN METHODSVOLTAGE AND CURRENT SENSINGCIRCUIT DIAGRAM IMPLEMENTATIONWORKINGAUDRINOWHY AUDRINOADVANTAGESCOMPONENTSFUTURE SCOPECONCLUSIONREFERENCE
OBJECTIVEThe objective of the prepaid embedded energy meter is to
perform quick and cost-effective measurements As the electronic version does not possess rotating parts it
helps in avoiding tampering Reduce electricity theft.High accuracyRemote automated data processing Reduction of human error
BLOCK DIAGRAM
DESIGN METHODOLOGY
Using instrumentation amplifiersHigh-gain accuracyHigh-input resistanceLow –output resistanceHigh common-mode rejection ratioLow noiseLow-input resistance and high-output resistance
VOLTAGE AND CURRENT SENSING CIRCUIT Must be non-intrusiveHigh input impedanceDesigned using Instrumental Differential
Amplifier Use of voltage divider circuitryNo noise factor
CIRCUIT DIAGRAM
VOLTAGE SENSING CURRENT SENSING
IMPLEMENTATION Implementing the current and voltage
sensing using op-amp LM324 IC
WORKING
AUDRINOMicrocontroller - ATmega328pOperating Voltage -5 vDigital I/O -Pins 14 (of which 6 provide PWM output)PWM Digital I/O Pins - 6Analog Input Pins - 6Clock Speed - 16 MHzFlash memory-32 kb
WHY AUDRINOSimple and accessibleSimplifies the amount of software and
hardware developmentIt contains an A/D converter alreadyAllows programming and serial
communication over USB.Allows to reset the programsRun in platforms like windows ,linux and mac
ADVANTAGES
MANUAL AUTOMATED
Probablity of error is largeSpeed of response is slowHuge man power requiredCost is highNo man/mc interferenceNo safety
Error is minimumSpeed of response is fastNegligible man powerCost is very lowMan/mac interface possibleIt is quite safe
COMPONENTSCOMPONENT QUANTITY OUTLAY TOTAL
AUDRINO KIT
1 1200 1200
LCD DIAPLAY
1 250 250
RS 232
1 100 100
LM-234
2 4 8
20 0.25 5
TOTAL=1563
CONCLUSION AND FUTURE SCOPEUsing this project we can reduce the manual
efforts to take the energy from energy meterIt is a user friendly project in which the
elctrical department can send the bill via SMS
Power consumption of the meter is an important design constraint
Though its overall cost is a bit high but if produced in a large scale we can reduce the cost
REFERENCE“Op-Amps and Integrated Circuits” Ramakant
A.Gayakwad, fourth edition.Instrumentation Amplifier” National
Semiconductor Linear Brief Lamego, M. M., Sousa, G. C. D., and Vierira,
J. L. F., “A Single Phase Microcontroller Based Energy Meter
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