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Thread: Teensy 3.2 AREF(EXTERNAL) and analogRead()

  1. #1
    Junior Member
    Join Date
    May 2019
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    2

    Teensy 3.2 AREF(EXTERNAL) and analogRead()

    Hello all,

    I am using the external voltage reference 2.048V with Teensy 3.2
    Then I am feeding voltage I am measuring (0-5V) via a voltage divider (0.5 ratio) to an analogue pin.
    However, I can only read voltages via ADC up to 4.09V (I think it is 2 x AREF). Above that the value of analogRead() does not change.
    Why is it the case? Do I need 2.5V external voltage reference fed into AREF pin?

    Thanks for your help.
    Regards
    Alex
    Last edited by alexsh1; 05-17-2019 at 07:49 PM.

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