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Arduino with RFID error


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6 hours ago, Delorean said:

Hi, all! My Arduino ide software serial monitor is showing like firmware version : 0x0 = unknown WARNING :Communication failure, is the mfrc522 properly connected ? scan picc to see uid, sak, type, and data blocks.... can you help me .

"scan picc to see uid, sak, type, and data blocks."  huh?

The mfrc522 supports three interfaces: 

• Serial Peripheral Interface (SPI)
• Serial UART (similar to RS232 with voltage levels dependant on pin voltage supply)
• I2C-bus interface

Which one are you using?

What software are you using?

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