Voltage Divider
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see also:
http://hyperdramatik.net/mediawiki/index.php?title=Voltage_Divider_what%3F
https://www.kobakant.at/DIY/?p=6102
Voltage Divider
External voltage divider connected to Arduino
Internal voltage divider inside Arduino
You can use the following line of code to turn on the internal pull-up resistors inside the Arduino's ATmega328 chip:
pinMode(A0, INPUT_PULLUP);