the Transceiver section .
The corresponding data is sent to the microcontroller. LCD is interfaced with the microcontroller to display the product name and cost. Sometimes people may find difficult to identify where the amount is printed in the pack. Here another advantage is that they can easily identify the product cost by dropping in the smart trolley. Similarly the total cost manipulated by the PC will also be sent to the LCD as well as the Printer .
Hence the bill can be got instantly after completion of purchase. Shopping itself a good entertainment.Everything can be got in a less price xcept satisfaction. People are frustrated while standing in the queues for a long time to get the bills. So we have developed a smart purchasing system for quick billing and to improve operational excellence in modern supermarkets. FLOW DIAGRAM: RFID SYSTEM: RFID (Radio Frequency Identification) is a means of storing and retrieving data through electromagnetic transmission to an RF compatible integrated circuit, and is now being seen as a radical means of enhancing data handling processes.
SYSTEM COMPONENTS: RFID systems have several basic components or technical characteristics that define hem. These are: 0 A reader, including an antenna The device that is used to read and/or write data to RFID tags. 0 A tag A device that transmits to a reader the data. 0 The communication between them.
RFID uses a defined radio frequency and protocol to transmit and receive data from tags. TYPES OF RFID TAGS: RFID tags can be segregated into two major classifications by their power source: Active tags Active tags contain both a radio transceiver and battery to power the transceiver.Because there is an onboard radio on the tag, active tags have substantially more ange (”300 feet) than passive or "active/passive tags. " Active tags are also considerably more expensive than passive tags and, as with any battery-powered product, the batteries must be replaced periodically. Passive tags Passive tags can be either battery or non-battery operated, as determined by the intended application.
Passive tags reflect the RF signal transmitted to them from a reader or transceiver and add information by modulating the reflected signal. A passive tag does not use a battery to boost the energy of the reflected signal.A assive tag may use a battery to maintain memory in the tag or power the electronics that enable the tag to modulate the reflected signal. PIC: The PIC16F877 Microcontroller is used in the project. The PIC Microcontroller is a Microchip product. This microcontroller has an built memory, CPL], Peripheral devices.
The PIC microcontroller is divided into three ranges, based on the instruction set. They are, Low Range PIC- 12 bits Mid Range PIC- 14 bits High Range PIC 16 bits PERIPHERAL FEATURES: Operating frequency: DC-20 MHz clock input. DC-200 ns instruction cycle. Wide operating voltage range (2.V - 5. 5V).
14-bit wide instructions, 8-bit wide data path. 13-bit program counter, 8 level stack (1 3-bit). Up to 368 byte of data memory (RAM). TimerO: 8-bit timer/counter with 8-bit prescaler. Timerl: 16-bit timer/counter with prescalar can be incremented 8-bit timer/counter with 8-bit period register, prescalar and postscalar.
-rn-ner2: Synchronous serial port (SSP) with SPI (master mode) and 12C (master/slave). Universal Synchronous Asynchronous Receiver Transmitter (USART/SCI) with 9-bit address detection. 0 Parallel slave port (PSP) 8-bit wide, with external RD, WR and CS ontrols (40/44 pin only).
