This paper describes a light, temperature and speed adjusting DDC system which is composed of MCS-48 series computer, sample-and-hold circuit. In this DDC system PID algorithm is used as the controlling algorithm.

• 本文主要介绍用mcs-48系列单片机,配以采样保持、A/D、D/A转换和模拟输出驱动板,并采用PID算法进行调节,构成直接数字控制DDC调光、调温、调速系统。