user85557: What happen when a  voltage measured by analogRead() is higher than AREF voltage?
Example: AREF = 2.5V AO = 3.2V
What is the maximum voltage ?

user4143: You will be reading the maximum ADC value. If you were sampling a waveform the top of it would be clipped off at 2.5v.

85557: <p>What happen when a  voltage measured by analogRead() is higher than AREF voltage?</p>
<p>Example: AREF = 2.5V AO = 3.2V</p>
<p>What is the maximum voltage ?</p>
 4143: <p>You will be reading the maximum ADC value. If you were sampling a waveform the top of it would be clipped off at 2.5v.</p>
