Abstract :

This project is aimed to design an E-challan billing system using wireless technology GSM.

                     A GSM modem provides the communication interface. It transports device protocols transparently over the network through a serial interface. A GSM modem is a wireless modem that works with a GSM wireless network. This GSM Modem can accept any GSM network operator SIM card and act just like a mobile phone with its own unique phone number. Advantage of using this modem will be that you can use its RS232 port to communicate and develop embedded applications. Applications like SMS Control, data transfer, remote control and logging can be developed easily. The modem can either be connected to PC serial port directly or to any microcontroller.

                    Due to the drastic changes in technology in the last decade, so many advancements were introduced in electricity departments. The present system is like, a person from electricity department has to go to each and every house to take the readings from the digital meter and present these details to the billing department and after all their processing, they generate a bill and another person comes and gives the electricity bill to us and finally we have pay the bill.

      To eliminate this long process and to make the work easy and also make the system totally an automated one, we have designed this project. Since the meter that reads the number of consumed units is actually a digital meter, it contains a controlling unit in it. To this unit, a GSM modem will be interfaced.  This system containing the energy meter calculates the power consumed by the house and sends the total number of units consumed and the amount to be paid for the consumed units, for a month, to the electricity department and also to the user. The user has to pay the bill within the due date. If the user did not pay the amount within the due date, the electricity department sends a predefined message to the system containing the energy meter. Thus, this system shuts down completely and the user cannot use the power from the energy meter until he clears the bill amount.

This project uses regulated 5V, 500mA power supply. 7805 three terminal voltage regulator is used for voltage regulation. Bridge type full wave rectifier is used to rectify the ac output of secondary of 230/12V step down transformer.

TECHNICAL SPECIFICATIONS:

HARDWARE:

Micro controller         :           AT89x series                              Power supply

Crystal                        :           11.0592 MHz                             Transformer: 12V step down 

GSM modem                                                                              filter: 1000uf/25V

Load                                                                                            Regulator: 7805, 7812

Relays

LCD                            :           HD44780

Energy meter

SOFTWARE:                                                                            APPLICATIONS

 Keil IDE                                                                                     1. Home applications.

 UC flash                                                                                     2.Industrial applications.

 Proteus                                                                                        3.Automatic control systems.