I have the exact same issue.
zweistein002:
Hi,The Arduino analog input voltage is max. 1V and the output voltage of the capacitive sensor is about 3V (if you use it from 3.3V power supply).
So you have to use a voltage divider at the output of the sensor.
This might be true, but even tested with a multimeter the output only changes when using a arduinoUNO
NodeMCU and Wemos D1 Mini seem to work sporadically. The weird result is a value of 0 - 7 on A0. To fix this, I temporarily ground the VIN pin of the sensor which causes it to function normally for a few seconds until it reverts to a faulty state.
The only way I can get this sensor working reliably is with an arduino UNO with VIN connected to 5v. Otherwise the Aout pin outputs absolutely no voltage.