一种基于Arduous单片机的p.i.d控制程序，可以通过使能端控制被控对象的输出变化方向，例如电机正反转、冰箱升温降温等。也可以根据个人需要去掉使能端，只用PID算法。(A P.I.D controller is accomplished based on M.C.U. we download the P.I.D lib from Internet and add it to the developing software environment. finally, we developed a program that finished the P.I.D　controller function.)