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The end result.
Pre-Knowledge.
Setup your Arduino.
http://brisbaneroboticsclub.id.au/setup-your-arduino/
References.
https://www.arduino.cc/en/Tutorial/ReadAnalogVoltage
Wiring Diagram.
See wiring diagram in references link.
Arduino Code.
File>Examples>01 Basics>ReadAnalogVoltage
Run the Code.
Upload the code to the Arduino.