When your pin is floating you will measure remaining charge on the pin from when the sensor was connected any crap from the surrounding that couples into the pin A high impedance floating pin is never an option. Also for a digital input. If you use a pin as an input button for example, then you always set a pull-up/down resistor to have a defined potential on the pin when the button is not pressed and therefore would be floating. The solution for you depends on the sensor you are using. Can it drive a load (pull-down-resistor)? What type of sensor is it? Dennis
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