Introduction - If you have any usage issues, please Google them yourself
1, based on the stm23f103c8t6 development board development, external rc522 read card board.
2, to achieve the windows system to recognize the device as HID keyboard, when you brush the M1 card, the 4 byte card number in the form of keyboard input to the computer.
3, has been tested on the XP, win7 system. Put the mouse in the text input box, swipe the card, the card number can be displayed in the text box, and enter the line feed.