In a recent blog post on omzlo.com, [Alain] explains how they found a bug in the Arduino SAMD21 analogRead() code which causes the output to be offset by between 25 mV and 57 mV. For a 12-bit ADC ...

The not-very-random result of a thousand analogRead() calls ... amps to amplify and filter the noise before feeding it to that Arduino pin. Maybe you were thinking about radioactive decay and ...

You'll typically see this when reading values from a pin, such as int temp = analogRead(A0). float - Similar to int but for numbers with decimals. You can read up on other elements in the Arduino ...