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• When I was using ID - 12 as my RFID receiver I used this breakout board from SparkFun.
• You could, obviously, wire it by yourself. But, I wanted to save time.
• Here is the tutorial for connecting ID - 12 RFID reader with Arduino via SparkFun breakout board, https://learn.sparkfun.com/tutorials/sparkfun-rfid-starter-kit-hookup-guide.
• Here is the full screenshot of the tutorial.