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Prepaid Electricity billing system using GSM technique

In conventional electricity billing system, the bill is taken after the utilization of energy. This system has many problems such as the human errors in taking readings and during keeping records. To overcome all such problems we are developing the prepaid electricity billing system This system consists of one card placed at consumer end, which will be connected to the meter. It takes pulses from meter as input and accordingly decrements the number of units. The number of units will be displayed on 7-seg display. The supply will be circulated in the house through relay.

LED indication is provided:


• When balance goes below 10, the LED starts blinking.

• When balance becomes zero, the LED glows completely.

• An alarm indication is provided to indicate low balance.

• When balance becomes zero the supply to the load will be get cut off.


At electricity board another unit will be used which will be interfaced to the PC. This unit consists of micro controller, RS 232, switching IC 4052, GSM Port/handset etc For recharging, the meter number and recharge code can be sent as a SMS, using Handset. The GSM Port/Handset connected to unit at electricity board will receive this SMS and compare meter no. and recharge code with its data base. When it finds the meter number and code it will send message to GSM Port/handset connected at consumer unit. When this message will be received the recharge will be done.


The unit at electricity board will consists of micro controller, RS 232,GSM Port/ Handset. The unit will be connected to the PC. The database for meter number and recharge code will be stored in the PC. For this purpose VB will be used as front end. The database can be done using MS Excel or MS Access.


The recharge can be done by sending SMS from handset. The SMS will contain the recharge code. This message is received at GSM port connected at main unit. The message will be decoded and recharge will take place.