通过L297、L298来控制两项步进电机的旋转，速度十档，电机旋转27圈就会回头，再转够27圈自停。可设定好档位后再开始，中途可以自由停止或是换向。-Through L297, L298 to control two stepper motor rotation and speed of ten stalls, motor rotation stop twice. Stalls can be set well after the start, or stop half-way free-for-

AVR单片机PWM产生正弦波，有仿真图和源程序，实验板通过-AVR microcontroller PWM generated sine wave, a simulation map and the source code, test board through

AVR单片机,用定时器1产生PWM波形,包含具体的程序说明-There are two disk files A and B, the storage line of letters, requested the information in these two documents combined (in alphabetical order), output to a new file C,.

一个可以实现多路pwm输出的avr汇编代码(pwm and avr and assembly this code est enable to give several output of pwm with 1k Hz)