What are the mounting hole dimensions of these?

I'm sure you've seen Adafruit's sensors similar to this:
https://www.adafruit.com/product/4494

What are the dimensions of those mounting holes? Does anyone know, or do I have to buy one and use CAD?

The holes are on the 0.1 grid like the through holes for your wiring.

a7

CAD files are available here:

Stupid school computer blocked the CAD files.

Well you could have done what I did… you must have left your thinking cap at home.

a7

Did you use the quarter for reference and measure it with CAD? That's not a new trick.

Adafruit products are open source, i found GitHub - adafruit/Adafruit-DPS310-PCB: PCB files for the Adafruit DPS310 Precision Barometric Pressure and Altitude Sensor on their GITHUB.

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