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- 1. EEPROM BASED SMART PREPAID ENERGY METER WITH AUTOCUT OFF ON NO BALANCE
- 2. INTRODUCTION The electricity bill can be paid now through E-Seva centers, ATMs and Net-banking. But prepaid electricity is a unique and new concept which saves lot of time and a power for electricity department and as well as consumers also. 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.
- 3. EQUIPMENT USED The Major Equipment used here are: AT89S52 Microcontroller EEPROM Liquid Crystal Display(LCD)
- 4. ADE7757 Design Calculations The design parameters are as follows: • Line voltage = 220 V (nominal) • IMAX = 30 A (Ib = 5 A) • Counter = 100 imp/kWh • Meter constant = 1600 imp/kWh • Shunt size = 350 micro ohms. • 100 imp/hour = 100/3600 sec =0.02777 Hz • Meter calibration at Ib (5 A) • Power dissipation at Ib = 220 V , 5 A = 1.2 kW • Freq. on F1 (and F2) at Ib = 1.1 0.0277 Hz = 0.0305555 Hz • Voltage across shunt (V1) at Ib = 5 A x 350 (micro ohms) = 1.75 mV rms
- 5. PRESENTLY WERE IT IS USED? In the UK, mechanical prepayment meters used to be common in rented accommodation. In the UK, one system is the PayPoint network, where rechargeable tokens (Quantum cards for natural gas, or plastic "keys" for electricity) can be loaded with whatever money the customer has available. In South Africa, Sudan and Northern Ireland prepaid meters are recharged by entering a unique, encoded twenty digit number using a keypad. This makes the tokens, essentially a slip of paper, very cheap to produce. Around the world, experiments are going on, especially in developing countries, to test pre-payment systems. To make the system easily accessible by customers.
- 6. AT89S52 MICROCONTROLLER 8K Bytes of In-System Flash Memory • 256 x 8-bit Internal RAM • 32 Programmable I/O Lines • Three 16-bit Timer/Counters • Eight Interrupt Sources
- 7. PIN DIAGRAM OF AT89S52
- 8. PIN DESCRIPTION Vcc Pin 40 provides supply voltage to the chip. The voltage source is +5V. GND Pin 20 is the ground. RESET Pin9 is the reset pin. It is an input and is active high. Upon applying a high pulse to this pin, the microcontroller will reset and terminate all the activities. This is often referred to as a power-on reset.
- 9. EEPROM (ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY) The 24C04 is a 4Kbit electrically erasable programmable memory (EEPROM), organized as 2 blocks of 256 x8 bits. They are manufactured in ST Microelectronics’ Hi-Endurance Advanced CMOS technology which guarantees an endurance of one million erase/write cycles with a data retention of 40 years. The memories are compatible with the I2C standard, two wire serial interface which uses a bi- directional data bus and serial clock
- 10. LIQUID CRYSTAL DISPLAY(LCD) In our project we will be using a LCD for displaying balance . We will be using a 16x2 LCD for this purpose. We interface LCD with Micro Controller as shown
- 11. POWER SUPPLIENG UNIT 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.
- 12. BLOCK DIAGRAM
- 13. WORKING OF THE PROJECT We can divide the working of the entire project into two major parts. Where one is Loading the amount into the unit. And the other is consumption of the amount and displaying that on a LCD. In first part we insert the recharged card into the slot and load the amount into the unit. And in the later one the ADC(Energy Meter)counts the units utilized by the consumer and will convert the analog data into digital data and will give to the controller.
- 14. CONTD.., Now the Micro Controller will decrease the amount following the usage calculated according to the tariff programmed. The net balance will be displayed in LCD.
- 15. SOFTWARE TOOLS We use KEIL and PROLOAD softwares to write the program in embedded C language and to dump the program into the Micro Controller respectively. KEIL KEIL is a software used where the machine language code is written and compiled. After compilation, the machine source code is converted into hex code which is to be dumped into the microcontroller for further processing. KEIL compiler also supports C language code.
- 16. CONTD.., PROLOAD PROLOAD is a software which accepts only hex files. Once the machine code is converted into hex code, that hex code has to be dumped into the microcontroller placed in the programmer kit and this is done by the PROLOAD.
- 17. ADVANTAGES Advantage for the electricity department as this unit can be utilized effectively for preventing power theft, non- payment of electricity bills etc Cost of manpower for billing / collection is reduced. Sophisticated security Better customer service
- 18. APPLICATIONS Banks Offices Industries Jeweler Shops and Home Applications
- 19. SCOPE FOR FUTURE ADVANCEMENTS CARD SECURITY-Programming a PIN number to the EEPROM card to avoid un authorized usage of the card.
- 20. CONCLUSION Prepaid energy meter is a concept to minimize the Electricity theft with a cost efficient manner. The users are not bound to pay excesses amount of money , users have to pay according to their requirement . It can reduces problem associated with billing consumer living in isolated area and reduces deployment of manpower for taking meter readings. Prepaid energy meter is more reliable and user friendly.