Embedded Prepaid Energy Meter using 89C51 Microcontroller

Title of the project: Embedded Prepaid Energy Meter using 89C51 Microcontroller
Domain: Embedded Systems Design
Software: Embedded C, Keil, Proload
Microcontroller: AT89C51
Power Supply: +5V, 500mA Regulated Power Supply
Display: LED 5mm
Crystal: 11.0592MHz
Recharge Card: EEPROM based card

ABSTRACT
Due to the drastic changes in technology in the last decade, so many advancements were introduced in electricity departments. The electricity bill can be paid now through E-Seva centers, ATMs, Net-banking and even through mobile phones. But prepaid electricity is a unique and new concept which saves lot of time and a power for electricity department. 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 three to four loads. If the load increases in the system, current also increases and is calculated by an ADC and its corresponding count is also calculated. Whenever the count value reaches one thousand, 1unit is decremented from EEPROM and these values are displayed on LCD.
An EEPROM 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 EPROM so that the data will not be lost even in power 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 loads connected to it by giving a continuous beep sound.
To use the system again the user has to reload the units by recharging the system. To recharge the system a separate recharging unit is provided.
The user has to connect the recharge card to recharging unit, and then the units will be loaded into recharge card. Now the user has to place this recharge card in slot provided to recharge. After pressing the recharge key, the system will be loaded with the units corresponding to that rechargevalue. After successful recharge, the load automatically gets ON.
This system uses 5V regulated power supply for the microcontroller and ADC unit and 18V supply for the load. This is provided by the 18V, 2Amp transformer. Recharging unit also requires regulated 5V supply, which is provided by a separate 18V
and 750mA transformer.
Hence this project provides a best solution for the users to know how much amount of power is consumed in their day- to- day life and also the amount of power consumed is also under the user control.



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