针对AVR ATXMEGA128A1单片机的BOOTLOADER自编程程序工程。已测试通过，稍微做改动也可以作为别的AVR型号自编程用。-For AVR ATXMEGA128A1 microcontroller BOOTLOADER self-programming program works. Have been tested, do a little changes that can be used as self-programming with other AVR models.

单片机演奏音乐的，keil编程，程序有原理说明-SCM play music, keil programming, the program has Rationale

基于51单片机的脉搏测量和体温测量，keil编程，proteus仿真。-Based on 51 single chip microcomputer s pulse and temperature measurement,keil programming and proteus simulation.