pripaid energy meter ppt 2.pptx

8/10/2019 PRIPAID ENERGY METER PPT 2.pptx

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INTRODUCTION In this system the user has to purchase an EEPROM based

recharge card and it should be inserted in the slot provided on

prepaid energy meter kit.

After inserting the recharge card into the system, the user

should press RECHARGE key to start recharge. Then the system will be loaded with specific units as per the

recharge card value. A 16X2 LCD is provided to read units

available.

Here the system is connected with lamp loads. Microcontrollercounts the pulses from the opto coupler of the energy meter

which depends on the energy consumption.

Whenever the count value reaches specific value which

depends on the energy meter constant, 1unit is decrementedand these values are displayed on LCD


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BLOCK DIAGRAM


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In this paper a microcontroller named AT89S52 is used to

count the pulses from the opto coupler, to display message

and number of units on LCD, and to trip the relay. An EEPROM named AT24C02 is provided on the board to

store the updated recharge units and energy meter pulse

count. At every instant the count value and units values are

stored in EEPROM so that the data will not be lost even inpower failure cases.

When 1 unit is decremented from EEPROM the system will

give a beep sound. When the recharged units become zero

on power consumption, the system shutdown all the loadsconnected to it by giving a continuous beep sound.

To use the system again the user has to reload the units by

recharging the EEPROM


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To recharge the system the user has to place the EEPROM

based recharge card in slot provided. After pressing therecharge key, the system will be loaded with the units

corresponding to that recharge value. After successful

recharge, the load automatically gets ON.

This system uses 5V regulated power supply formicrocontroller, LCD, EEPROM and driver IC and 12V

supply for relay which is supplied form a step down

transformer


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WORKING PROCEDURE

The primary controller collects information from energy

meter as well as from the smart card. Here, switches areused instead of the IC.

Smart card, which is the switch, gives information about the

limitation of units. The energy meter reading is compared

with the smart card information by the microcontroller.Depending upon the result, the microcontroller will activate

the buzzer if the credit is low and the Controller will trigger

the Relay if the credit goes very low.

The relay is the switching device to cut off and restorepower supply. The LCD is interfaced to microcontroller

using parallel port connection. The microcontroller based

system, continuously records the readings.


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REAL TIME IMPLEMENTATION OF

PREPAID ENERGY METER


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ADVANTAGE

controlled usage of energy is possible and this system

burden of electricity billing

saves money and time Save the paper cost

It controls reduce the loss of power and revenue due

to power thefts and other illegal activities.


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CONCLUSION

In this paper Prepaid Energy Meter, energy consumption

calculation based on the counting of pulses is designed and

implemented using Atmel 89S52 MCU in embedded system

domain. An LCD is provided to display the number of units

remaining, so controlled usage of energy is possible and this

system eliminates burden of electricity billing and saves

money and time for electricity department and consumers

respectively.

Presence of every module has been reasoned out and placed

carefully thus contributing to the best working of the paper

has been successfully implemented


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THANK YOU


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FEATURES OF AT89S52

8K Bytes of in-system Programmable Flash Memory.

4V to 5.5V Operating Range. Fully Static Operation: 0 Hz to 33 MHz

Three-level Program Memory Lock.

256 x 8-bit Internal RAM.

32 Programmable I/O Lines.

Three 16-bit Timer/Counters.

Eight Interrupt Sources.

Fully Duplex UART serial Channel. Low-power Idle and Power-down Modes.

Fast programming time


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MICROCONTROLLER (AT89S52)

INTRODUCTION

Microprocessors and microcontrollers are widely used

in embedded systems products. Microcontroller is a

programmable device. A microcontroller has a CPU in addition to a fixed amount

of RAM, ROM, I/O ports and a timer embedded all on a

single chip.

The fixed amount of on-chip ROM, RAM and number ofI/O ports in microcontrollers makes them ideal for many

applications in which cost and space are critical.


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8051 is an 8-bit processor, meaning that the CPU can workon only 8 bits of data at a time. Data larger than 8 bits has

to be broken into 8-bit pieces to be processed by the CPU.8051 is available in different memory types such as UV-EPROM, Flash and NV-RAM.

The present paper is implemented on Keil Vision. In orderto program the device, proload tool has been used to burnthe program onto the microcontroller.

The features, pin description of the microcontroller and thesoftware tools used are discussed in the following sections.

pripaid energy meter ppt 2.pptx

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