I think higheight is done with the barometer. IR transmitter and receiver sense surface below in approximity.Great video John. I really enjoy watching you smiling while flying the Tello. There is a small error on what you said about the VPS. It isn't the IFR camera, but rather the small camera in the middle of them to keep the Tello steady in one place. The red and black camera calculates the Tello's height against the floor.
That is what I wanted to say. It does it to prevent going over 30m or land softly. I'm not sure. Need to do some testing.
I do not have a link, but rather from experimenting myself. If you tape over the sensor in the middle, you will observe the Tello doesn't hold in place.Excellent, Ansia, do you have a link?
The IR sensor at that kinda of scale is very short range. It just does not work when it is not even near 2m let alone 30m. Ultrasonic sensors on some other drones can work up to 5-6m on a side note.