滤波法：相当于“中位值滤波法”+“算术平均滤波法”,连续采样N个数据，去掉一个最大值和一个最小值,然后计算N-2个数据的算 术平均值 N值的选取：3~14

优点:融合了两种滤波法的优点,对于偶然出现的脉冲性干扰，可消除由于脉冲干扰所引起的采样值偏差

缺点:测量速度较慢，和算术平均滤波法一样,比较浪费RAM



164显示：只需两个IO口即可驱动，节约IO脚

-Filtering method: method: the equivalent of " median filtering" + " arithmetic mean filtering method" , continuous sampling of N data, removing a maximum and a minimum N-2 and then calculate the arithmetic mean of data　N value of the selection: 3- 14 Benefits: fusion of two filter method has the advantage, for the occasional impulse interference, can eliminate the interference caused by the sampling pulse deviation Disadvantages: slow measurement speed, and arithmetic mean filtering method , as more waste RAM 164 shows: Just two IO ports can be driven, saving IO feet