Arduino due and pir sensor

My suggestion:
(I have never used this sensor)

  • Plan to power the sensor with 3.3V instead of 5V.
  • Power the sensor up on the bench with 3.3V, and measure the output voltage range.

If the alarm output max voltage is <= 3.3V, then your good to go.

Chances are, it will be fine, as the digital alarm output voltage is most-likely limited to the excitation voltage of 3.3V. To be certain, measure it before connecting the alarm output to the DUE.

-Chris