使用单片机为AVRmega16，程序运行环境为codevisionavr，程序主要功能是通过电压反馈调整PWM波的输出，用键盘输入可改变PWM波占空比，经滤波后可得直流电压，相当于键盘控制电压输出。-Using microcontroller AVRmega16, program operating environment for codevisionavr, program main function is adjusted through a voltage feedback PWM wave output, can be changed using the keyboard input wave PWM duty cycle can be obtained by filtering the DC voltage, the equivalent of keyboard control voltage output.