如图所示，我用了这样的原理进行ad采集，为什么我采集的电压数值ADC = 33652
ADC = 33078
ADC = 33059
ADC = 33072
ADC = 33076
ADC = 33052
ADC = 33069
ADC = 33046
ADC = 33044
ADC = 33023
ADC = 33043
ADC = 33052
ADC = 33029
ADC = 33031
ADC = 33011
ADC = 33014
ADC = 32978
ADC = 32979
ADC = 32974
ADC = 32973
ADC = 32996
ADC = 32971
ADC = 32971
ADC = 32951
ADC = 32962
ADC = 32958
ADC = 32936
ADC = 32935
ADC = 32922
ADC = 32920
ADC = 32918
ADC = 32907
ADC = 32941
ADC = 32929
ADC = 32936
ADC = 32940
ADC = 32893
ADC = 32924
ADC = 32892
ADC = 32935
ADC = 32910
ADC = 32896
这样不稳定呢？求解释