SMART CARD PREPAID ENERGY

METER USING GSM

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 modem.

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.

HARDWARE

REQUIREMENTS:

ARM MICROCONTROLLER

GSM MODEM

LCD

LED

RESISTORS

CAPACITORS

DIODES

TRANSFORMER

REGULATOR

RELAY

ENERGYMETER

LAMP

SOFTWARE

REQUIREMENTS:

KEIL COMPILER

EMBEDED C

HARDWARE REQUIREMENTS

ARM MICROCONTROLLER

ARM9TDMI based high-performance 32-bit RISC

micro-controller with thumb extensions. 16kb on-chip

ROM, 256kb SRAM, 32kb instruction cache, 32kb

data cache, clock up to 208 MHz 3 channel

multiplexed 10-bit ADC, RTC, and 32-bit general

purpose high speed timer.

Two UART’S, one with full modem interface, two

I2C serial interfaces, two SPI serial interfaces. CPU

clock up to 60 MHz

ENERGY METER:

• An energy or electric meter is a device that measures the amount of

electrical energy consumed by a residence, business, or an

electrically-powered device.

• Electric meters are typically calibrated in billing units, the most

common one being the kilowatt hour.

PIN DIAGRAM OF ARM MICROCONTROLLER

SERIAL COMMUNICATION

• used for all long-haul communication

• Cables that carry serial data

• RS232 carries serial data in between micro controller

and MODEM through DB9 connector

MAX 232:

The MAX232 is an integrated circuit that converts signals from

an RS-232serial port to signals suitable for use in TTL

compatible digital logic circuits.

The MAX232 is a dual driver/receiver and typically converts

the RX, TX, CTS and RTS signals .

When a MAX232 IC receives a TTL level

to convert, it changes a TTL Logic 0 to

between +3 and +15V, and changes TTL

Logic 1 to between -3 to -15V, and vice

versa for converting from RS232 to TTL.

DB9 CONNECTOR:

• The DB9 (originally DE-9) connector is an analog 9-pin plug of

the D-Sub miniature connector family (D-Sub or Sub-D).

A relay is an electrically operated switch. Many relays

use an electromagnet to mechanically operate a switch, but

other operating principles are also used, such as solid-state

relays.

Relays are used where it is necessary to control a circuit

by a low-power signal (with complete electrical isolation

between control and controlled circuits), or where several

circuits must be controlled by one signal.

Relays with calibrated operating characteristics and

sometimes multiple operating coils are used to protect

electrical circuits from overload or faults

RELAY:

GSM COMMUNICATION

The term GSM usually means the GSM standard

and protocols in the frequency spectrum around

900MHz.

Mobile Station:The MS is the physical equipment used by a

subscriber, most often a normal hand-held cellular

telephone.

Base transceiver station:

The BTS comprises the radio transmission and

reception devices, and also manages the signal

processing related to the air interface.

GSM MODEM:

A GSM modem is a specialized type of modem which accepts a SIM

card, and operates over a subscription to a mobile operator, just like a

mobile phone.

From the mobile operator perspective, a GSM modem looks just like

a mobile phone.

When a GSM modem is connected to a computer, this allows the

computer to use the GSM modem to communicate over the mobile

network.

While these GSM modems are most frequently used to provide

mobile internet connectivity, many of them can also be used for sending

and receiving SMS and

MMS messages.

IR LED:

An IR LED, also known as IR transmitter, is a special purpose LED

that transmits infrared rays in the range of 760 nm wavelength.

The appearance is same as a common LED. Since the human eye

cannot see the infrared radiations.

The camera can show us the IR rays being emanated from the IR LED

in a circuit.

LIQUID CRYSTAL DISPLAY (LCD):

Most common LCDs connected to the microcontrollers are 16x2 and

20x2 displays.

This means 16 characters per line by 2 lines and 20 characters per line

by 2 lines, respectively.

DISPLAY UNIT

LCD BACKGROUND:If an 8-bit data bus is used the LCD will require 11 data lines

(3 control lines plus the 8 lines for the data bus)

The three control lines are referred to as EN, RS, and RW

EN=Enable (used to tell the LCD that you are sending it data)

RS=Register Select (When RS is low (0), data is treated as a command)

(When RS is High(1), data being sent is text data )

R/W=Read/Write (When RW is low (0), the data written to the LCD)

(When RW is high (1), the data reading to the LCD)

SOFTWARE REQUIREMENTS

Keil an ARM Company makes C compilers, macro assemblers,

real-time kernels, debuggers, simulators, integrated environments,

evaluation boards, and emulators for ARM7/ARM9/Cortex-M3,

XC16x/C16x/ST10, 251, and 8051 MCU families.

Compilers are programs used to convert a High Level Language

to object code. Desktop compilers produce an output object code for

the underlying microprocessor, but not for other microprocessors

KEIL COMPILER:

AT COMMANDS:

AT commands are instructions used to control a modem.

AT is the abbreviation of Attention. Every command line starts with

"AT" or "at". That's the reason, modem commands are called AT

commands.

Many of the commands that are used to control wired dial-up

modems, such as ATD (Dial), ATA (Answer) supported by MODEM.

Besides this common AT command set, GSM modems and

mobile phones support an AT command set that is specific to the GSM

technology, which includes SMS-related commands like AT+CMGS

(Send SMS message), AT+CMSS (Send SMS message from storage),

AT+CMGL (List SMS messages) and AT+CMGR (Read SMS

messages).

• Using this project we can reduce the manual

Efforts to take the readings from the energy

Meter which is cost effective solution .

• Reduces man power.

• It is user friendly and we can enhance this

Project ,in which an electricity department can

Send message to the consumer about the

billing information.

CONCLUSION

REFERENCES

[1] M I Tibbenham, “Implementing a Pre-payment System” IEE

International Congress on Metering and Tariffs for Energy

Supply, Birmingham, UK, 1999, pp 251-257.

[2] Muhammad Faheem Khan, Ahmed Zoha, and Rana Liaqat

Ali ‘’Design and

Implementation of Smart Billing and Automated Meter Reading

System for Utility Gas ‘’Proc. in IEEE Conference on

Information and Emerging Technologies, 2007, pp1-6

[3] KwanB H, M Moghawemi ‘’PIC Based Smart Card

Prepayment System‘’ Proc. in IEEE Student Conference on

Research and Development, Malaysia, 2002, pp 440-443

Thank You