Delorean Posted March 18, 2022 Report Share Posted March 18, 2022 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 . Quote Link to comment Share on other sites More sharing options...
HarryA Posted March 18, 2022 Report Share Posted March 18, 2022 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? Quote Link to comment Share on other sites More sharing options...
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