说明：  在单片机中由于CPU的A/D精度、模拟通道处理限制和各种漂移，得到的数据往往不尽人意，本程序用简洁的语句即解决了上述问题，又不失数据的动态性。
(In single-chip CPU due to the A/D precision, analog channel to deal with limitations and a variety of drift, the data obtained are often unsatisfactory, the procedure with a concise statement that solves the above problems, without losing the dynamic data.)