The pull-up or pull-down resistors for analog inputs can be enabled or disabled;
however, both pull-up and pull-down cannot be enabled at the same time. The
pull-up and pull-down resistance is 3.3 kΩ.
3.1.2.3. Analog input connections
Analog inputs are susceptible to system noise, which can affect the accuracy of
the signal. Signal accuracy can also be affected by ground level shift, which can
cause inputs to activate when they shouldn't.
System noise
To prevent noise pickup on the sensors,
Use the shortest possible wires when connecting analog inputs to sensors.
The following shows how to connect an analog input to reduce system noise:
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