electrcal billing

8/7/2019 ELECTRCAL BILLING

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VIPIN VCMUTHURAJ M P

AARUNI V C

DHANYA N


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Improves the efficiency of the billing system by the application of digitalsignal processing IC

Reduced manual control Basically involves:

Measurement section-IC CS5460 Control section-89c52 Display section-LCD Communication section-GSM Memory-IC 2402


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CONTROLSECTION

DISPLAYSECTION

COMMUNICATIO

NSECTION

MEASUREMENT

SECTION

MEMORYSECTION


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CS5460 is used for measurement

FEATURES OF CS 5460: Highly integrated ADC which combines two ADCs

High speed power calculation functions Serial interface on a single chipDESIGNEDTO ACCURATELY MEASURE:

Energy Instantaneous power Irms Vrms

It consists of bidirectional serial interface for communication withmicrocontroller and a fixed width programmable frequency output thatis proportional to energy.

The product is initialised and fully functional upon power up Includes facilities for system-level caliberation under control of the user

program


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89C52 is used for control section 40 pins DIPPERIPHERAL FEATURES: Timer 0:16 bit timer/counter Timer 1:16 bit timer/counter

Timer 2:16 bit timer/counter with 3 operating modesSPECIAL MICROCONTROLLER FEATURES: 8KB in system programmable Flash program memory of endurance

1000 erase/write cycle,typical 256X8 bit internal data RAM 32 programmable I/O lines

8 interrupt sources Programmable serial channel(UART)CMOS TECHNOLOGY: Low-power idle and power down modes Fully static operation:0 Hz to 24 MHz


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SIM300 GSM modem is used for communication between the user terminaland the service provider

The Key Features are:

Power Supply: Single supply voltage

Power saving: Typical power consumption in SLEEP mode to 2.5mA

GPRS Connectivity: GPRS multi-slot class 10

GPRS mobile station class BSMS: MT,MO,CB,Text and PDU mode SMS storage:SIM Card Support transmission of SMS alternately over CSD or GPRS. User can choose preferred mode.


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SIM interface: Supported SIM card:1.8V,3VTwo serial interfaces:

Serial port 1 Seven lines on Serial Port Interface Serial port 1 can be used for CSDFAX,GPRS service and send AT

command of controlling module. Serial port 1 can use multiplexing function,but serial port 1 and 2 can

not be used at the same time. Autobauding supports baud rate from 1200bps to 115200bps. Serial port 2 two lines on Serial port Interface/TXD and/RXD Serial port 2 only used for transmitting AT command.


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16x2 LCD module is used as display section

FEATURES: Liquid Crystal Display is a thin ,flat display device made up of any number of

color or monochrome pixels arrayed in front of light source or reflector 4 bit control is used for data transmission

3 pins RS,RW, and Enable is used to select whether the data or command is sent 5*7 matrix display Data we are sending are put into Data Display RAM Maximum size of Data Display RAM is 40 bytes


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IC 2402 is used as memory section

FEATURES : Low power CMOS Hardware write protection:Write control pin Internally organised as 256x8 Two-wire serial interface:Bidirectional data transfer

protocol 400 KHz compatibilityI2C bus is used for data communication betweenmicrocontroller and 2402


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PIN CONFIGURATION OF2402


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MEASUREMENT SECTION


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CONTROL SECTION


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The circuit is built around an 89c52 core. The heart of this ckt is CS5460 which is a bidirectional energy measuring chip with

built in dsp The measured value are stored in different registers inside the chip. This ic communicates on spi protocol .

An 16X2 lcd is used for providing user interface . A memory ic 24c02 provides the provision for backing up the total usage on

powerfail. For gsm communication SIM300 gsm modem with serial interface is used. First of all the peripheral devices must be initialised properly.For initialising lcd first

the mode of operation must be selected properly.The measuring IC CS5460 is

initialised by applying proper values in the control registers. The line voltage and the voltage proportional to the line current is fed to the input

pins of the measurement IC CS 5460 through the voltage and current transformers. The power is calculated in the CS5460 by digital signal processors in every clock

cycles. The calculated power is accesed by the micro controller using SPI bus.

The power is stored in a microcontroller register and updated in each conversioncycle.


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The electrical bill is calculated as per the rate. This datas are stored in memory IC2402 using I2C bus.The datas are displayed

in the LCD continuously for user interface. Whenever the service provider request for the data ie voltage,load,bill or usage. The controller responds after comparing command with each possible codes. The valid command formats are as follows :Request for current line voltage :Request for current load

:Updates the rate :Request for total usage


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The existing billing system is human employed which is a time consumingprocedure and the metering device used is an electromechanical device.Thusthe metering procedure is prone to errors. The system that we have describedhere helps to overcome these kind of errors in the metering method.Thissystem utilises digital signal processing IC, which reduces error considerably.

As solid state devices are used here, the system is more durable. It helps to detect and avoid electrical theft. This automated billing system uses GSM2G network for making the billing

procedure simpler and cost effective. This system can effectively be used for online billing by connecting the service

provider with the world wide web and SMS gateway. The subscriber can use any advanced banking methods such as credit cards,e-

banking etc.

electrcal billing

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