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Issue #211 February 2008
RFID Payment Terminal
by Carlos Cossio
Start | System Overview | Energy Transmission | 100% Amplitude Modulation | Load Modulation | MIFARE Card | MIFARE and ISO 14443 | Pay as You Go | Hardware Design | Antenna Design Rules | Antenna Size | Directly Matched Antenna | Firmware Design | Catch the Wave! | Sources & PDF
CATCH THE WAVE!
RFID contactless cards are becoming increasingly popular in many fields where barcodes and smart cards were used. They open up many new possibilities, such as applications in payment cards, passports, or even ID cards. You may see RFID contactless cards as the next evolution of the contact smart card, which has many advantages over the contact cards.
You have learned how to exchange information wirelessly with the MIFARE contactless card using a dedicated chip, MF RC531, for modulation and demodulation of a radio wave signal as well as the coding and decoding of the data. In addition, thanks to the versatility of the MF RC531, it is possible to upgrade the firmware to deal with any ISO 14443 contactless card without any hardware modifications.
You have also learned how to design a coil antenna with a range of up to 10 cm. It is built with off-the-shelf components, using a direct matching antenna technique when the reader and the antenna are close together.
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