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