CSV File can modify data in field without problems with override value in next field. In this version support only numberic byte fields (range values 0-255). Deleting content Lines in CSV file can be ...
You'll need an Arduino/Genuino Uno and N number of resistors (I used 3) to make a voltage divider if the voltage you are measuring is above 5v Upload the Arduino_voltmeter.ino onto your Arduino.
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