flash led with PWM with AVR

用AT89C2051音乐，avr控制的LED时钟,用P87LPC762控制的电动栏杆，电视遥控器，用PIC16C54控制的电话扩音器等多个程序-AT89C2051 music, avr controlled LED clock, P87LPC762 control the electric fence, the TV remote control, the PIC16C54 control phone speaker program

类似LED手电筒的三档调光带记忆程序源码(汇编),编译环境：AVR Studio 4,调试通过。电源为6v铅酸蓄电池（也可以用锂电池，但要修改相应参数），设欠压保护5.25v,低于此值则进入休眠状态,主频通过熔丝位设为4.8MHz,电源开关作为开关和换档,快速连续按键视为换档操作，慢速只有开关功能,类似于手电筒调光。-Similar LED flashlight Three dimming with memory program source code (assembly), the compi