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Phyphox can do so much that explaining it all would take hours. The real fun starts once you begin testing the world around you.
I love getting my geek on, and I do so every day. But sometimes, I need access to scientific tools that are either way out of my price range or inaccessible.
The good news is that my Pixel 9 Pro smartphone includes several tools for such purposes. Those tools are the various sensors that the OS and the installed apps depend on. The sensors are used for a range of tasks, including sensing ambient light, recording steps taken, directions on maps, screen rotation, and much more.