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Thread: Measure over 3.3 v

  1. #1

    Measure over 3.3 v

    I will need a voltage divider to reduce the voltage of an input signal ie 12v

    Is there a chip / breakout board suited to this task

    Is there an easy way to allow the resistor to be adjusted for different voltages ?

  2. #2
    Senior Member+ Theremingenieur's Avatar
    Join Date
    Feb 2014
    Colmar, France
    Ohm’s law (8th grade stuff) allows you to calculate whatever voltage divider.

    Little reminder: Vout = Vin * R1 / (R1 + R2), so to bring 12V down to 3.3V, select R1 to 3.3k and calculate R2 to 8.7k.

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