现代单片机的ad转换源码，改变通道，软件滤波是中值滤波的方法，取十次，然后冒泡，再去掉最大值和最小值，再求均值！-Modern SCM ad conversion source, change channels, filtering software is the median filtering method, taking ten times, then bubbling, then remove the maximum and minimum values, and then averag