对RC500卡的读和写，假如刷卡正确的话模块上的LED灯就会亮，没有卡、卡不对、或是其他的不能识别的都不能通过-RC500 card to read and write, if correct module on the card will be light, LED lamp without card and card wrong, or other cannot identify cannot pass

当要进门时，持卡人走到读卡区读卡，读卡器接收到IC卡读卡信息后，将卡号信息传送到上位机供分析，根据用户信息以及对用户设定的门禁权限判断该卡是否合法，同时将该信息与日期、时间记录下来供查询。 本系统由用户信息、门禁权限信息、正常刷卡记录、非法刷卡记录等应用模块组成。 -When going inside, the cardholder walk to read card area reading card and card reader to receive IC card readin

51单片机控制读卡器模块，实现IC刷卡控制继电器开关功能，实现开关门-51 MCU control reader module, IC card control relay switch functions, to achieve the door switch

stm32连接蓝牙模块，通过外接NFC刷卡的原理图，实现了usb转串口，并同时供电功能。可以外接电池。为dsn格式。- STM32 connect the Bluetooth module, through the external NFC card of the principle diagram, to achieve the USB to the serial port, and at the same time power supply. External battery.