This paper presents a MMC card is used for credit storage and used as a smart card on an SPI interfaced Card reader chip. The MMC card is credited with balance and is used as credit card for shopping purpose. The MMC card is inserted inside the card reader and the amount can be read by RF card reader and passes the signal to microcontroller and the corresponding amount can be displayed in LCD Display.
The proposed system consists of MMC card which is used as credit storage for shopping purpose. The RF card reader can be used to read a value from MMC card and it passes the signal to microcontroller and the corresponding amount can be displayed in the LCD.