In this video, we show how to configure an Arduino UNO board for precise voltage measurements. A good-quality power supply is required for this. Also, you must know the exact value of the reference voltage the AD converter is using. Do not simply assume that it is 5 V or so, measure it. If you follow the instructions carefully then you too can take accurate measurements with an Arduino board.
#Arduino @Arduino

Contents
========
0:00 intro
0:15 Analog-to-digital converters
1:12 analogRead()
1:57 Convert to volts
2:49 Floating-point calculations
3:36 A practical application
5:15 Better resistors
6:38 Measure the reference
7:41 Use a good power supply
8:52 analogReference()
10:00 Interference
10:59 Summarizing

Resources
=========
* Arduino UNO Rev3: https://www.elektor.com/arduino-uno-rev3
* A good multimeter: https://www.elektor.com/hioki-dt4256-...
* A good power supply: https://www.elektor.com/peaktech-6225...

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