GSM BASED PREPAID ENERGY METER BILLING VIA SMS

GSM BASED PREPAID ENERGY METER BILLING VIA SMSGUIDED BY:S.Latha,TEAM MEMBERS:Valliappaan PriyadharshiniSaranya Sathish RajaABSTRACTThe 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.

BLOCK DIAGRAM

SMART CARD BLOCK DIAGRAMHARDWARE REQUIREMENTS:

8051 MICROCONTROLLERGSM MODEMSmart Card (SLE-4442)LCDLEDRESISTORSCAPACITORSDIODESTRANSFORMERREGULATORRELAYENERGYMETERLAMPSOFTWARE REQUIREMENTS:KEIL COMPILEREMBEDED CHARDWARE REQUIREMENTS

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.

MICROCONTROLLER: AT89S51It is a smaller computerHas on-chip RAM, ROM, I/O ports...

RAM ROMI/O PortTimerSerial COM PortMicrocontrollerCPUA single chip

Features of AT89S51/52:Compatible with MCS-51 Products8K Bytes of In-System Programmable (ISP) Flash MemoryEndurance: 10,000 Write/Erase Cycles 4.0V to 5.5V Operating Range Fully Static Operation: 0 Hz to 33 MHz256 x 8-bit Internal RAM 32 Programmable I/O Lines Three 16-bit Timer/Counters Full Duplex UART Serial Channel Interrupt Recovery from Power-down Mode Watchdog Timer Dual Data PointerPIN DIAGRAM OF AT89S51:

40 Pin IC4 Ports32 Programmable I/O Lines

230 V AC 50 HzBridge rectifierFilter(470f)5v Regulator5V DC 12V step down transformerPOWER SUPPLY:

SERIAL COMMUNICATIONused for all long-haul communicationCables that carry serial dataRS232 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).

Arelayis anelectricallyoperatedswitch. Many relays use anelectromagnetto mechanically operate a switch, but other operating principles are also used, such assolid-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 COMMUNICATIONThe 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 UNITLCD 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 RWEN=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 REQUIREMENTSKeil 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).SNAP SHOT:

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.

CONCLUSIONThank u.........Queries . ?.??