学习pid算法编写和控制，pid在工程应用很广，在自动化领域更广，可以自动调节使输出值跟设定值在一个位置上，有增量式PID和位置式PID(Learning PID algorithm Writing and control, PID is widely used in engineering, in the field of automation more widely, can automatically adjust the output value with the set value i