How and Why to Use the Arduino ADC Internal Reference

In this Instructable we look at the ADC internal reference in an Arduino, why / when would you use it, how to ensure you get good measurement accuracy when using it, and how to use it to check your battery voltage. You can find the code on my blog at

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    Eric Brouwer

    3 years ago

    Thanks for sharing. I have been using the internal reference for all my projects so far.