一款51单片机的开发板PCB工程。内容比较简单，可用于AD的训练。(A 51 MCU development board PCB project. The content is relatively simple and can be used for AD training.)

一个简单的蓝牙HC05与51单片机通信。(it`s an easy bluetooth project based on stc89c52 and keil u4,for the communication between bluetooth and MCU.)