This library only support TTL RS232 serial port. VCC support 3.3 ~ 5V TX, RX connect to Arduino or Seeeduino T1, T2 is the Signal port for RFID antenna W0, W1 is for wiegand protocol, but this library ...

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Abstract: In a shopping mart, imagine ten people waiting in line. If the first five people have many items in their carts, the last person with only one or two items may wait a long time to pay. To ...