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12:49 AM
How nice to get the updated documentation. (1) The user guide we are reading is V1.1, 2009, which is outdated, because it says optimum power for module is 3V3~3v6, not according to your test results. (2) The user guide never mentions RC522, so I guess you cannot use PiMyLifeUp's library. Hopefully they will give you a link to the library. Good luck and cheers.
 
 
3 hours later…
3:23 AM
By the way, there is another wiring thing you might like to confirm: (1) for UART wiring, we cross over one side of Tx to other side of Rx, and vice versa. (2) Now for SPI, not all developers/vendor follow this rule of thumb: they direct Tx to Tx, and Rx to Rx. Would you like to comment, or counter suggest anything? Please also read the little note at left bottom of the following schematic.
 
 
7 hours later…
10:10 AM
Yeah the connection was from Mosi to Mosi and Miso to Miso. No crossover, as you have said. Only serial requires that kind of tx to rx connections. I have found a c based code which i think is very similar to the arduino c code examples for rfid reading. I will give that a shot next week
 

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