This is a library used for communicating with mifare card MFRC522.
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SS - Slave select(Master Out - active low)
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CS - Chip Select (Slave In)
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MOSI - Master Out Slave In(Common)
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MISO - Master In Slave Out(Common)
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SCK - Serial clock (Common)
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CPOL - Clock polarity
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CPHA - Clock phase
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CPOL and CPHA are used to identify the clock edge to begin
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PICC - short for Proximity Integrated Circuit Card (RFID Tag itself)
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PCD - means Proximity Coupling Device
SPI tutorial raspberry Connection RPI j8 RPI GPIO Layout GPIO Layout RC522 with Audrino