此为51单片机项目程序，具有发送端和接收端，两端通过nRF24L01进行通信，然后发送端具有键盘可以输入密码，接收端有键盘可以修改密码。在密码发送之前会进行简易的加密操作。而且双端的通信可以进行跳频操作。-This is the microcontroller 51 project procedures, a transmitting end and the receiving end, both ends of the through nRF24L01 communicate with a k