使用自己设计的板子,线圈处于金属的正上方一定距离,并保持静止。读取其频率一直在往一个方向变化,比如一直增大,或者一直减小。目前只有一路线圈,且量测CH0 INA脚的电压在1.4V左右,请问这个是什么问题,导致频率一直往一个方向变化?
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