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@majsterV2: Atmega328p datasheet str.253

The ADC is optimized for analog signals with an output impedance of approximately 10 k or less. If such a

source is used, the sampling time will be negligible. If a source with higher impedance is used, the sampling

time will depend on how long time the source needs to charge the S/H capacitor, with can vary widely. The user

is recommended to only use low impedance