pwm调速直流电机 ,STC80C52利用微处理器的数字输出来对模拟电路进行控制的一种非常有效的技术，广泛应用在从测量、通信到功率控制与变换的许多领域中。-pwm speed DC motor, STC80C52 use digital output to microprocessor control of the analog circuit, a very effective technique, widely used from the measurements, power control and communications to transform many areas.