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RFID RC522
This is a very inexpensive RFID module with an MFRC522 integrated circuit
and a PCB antenna.
Pinout
+-------------------------------------+
| ANTENNA |
| |
| XTAL NXPRC522 |
| |
+ *SDA SCK MOSI MISO IRQ GND RST 3V3 +
*SDA is the SPI NSS input.
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