基于51单片机电子罗盘，传感器用HMC5883，程序亲测成功。-Based on 51 single-chip electronic compass sensor HMC5883, pro-test program successfully.

基于51单片机的DS1302时钟，内含Keil4程序文件，亲测可用。- 51 microcontroller-based DS1302 clock, containing Keil4 program files, pro-test available.

基于51单片机程序例程，内含160例，实验板亲测可用。-51 MCU routine, containing 160 cases breadboard pro-test available

无线模块esp8266控制led灯亮灭51单片机底层程序，只有51单片机的程序没有控制app，使用网络调试助手可以实现手机与51单片机通讯，从而达到控制led灯的亮灭，亲测可行(The wireless module esp8266 controls the LED lamp to extinguish the 51 single-chip microcomputer bottom program. Only the 51 MCU program does not control app. Us