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About error 12, invalid argument

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  • #16
    Arduino UNO only have one SS_pin ,so i can use the SPI code to define another SS_pin? or define who master who slave?

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    • #17
      You can used any unused pin on Arduino for SS pin. It is defined by you. For example, pin 10 is used by default for SS pin of PHPoC shield. and you can use pin 5 as SS pin for RFID-RC522 by changing the code #define SS_PIN 10 to #define SS_PIN 5 , and connect SS pin of RFID-RC522 to pin 5 of Arduino

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      • #18
        Wow I think the hardware can't change by the code but it can work now .
        You are genius !!! Thanks for you help.

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        • #19
          You are welcome

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