stewe12
Well-known member
Regarding the height. If I start flying my Tello on a hill and then fly over valley, the height is much more than 30m, but the Tello is showing only 30m. Also if I am flying on hill and I need to land a little lower, it shows negative height.
So My assumption is that Tello computes the height based on gyro and accelerometer input. That means it will fly as far as the output of these two is equal to 30m, than it will stop. It is also the only way of calculating height with the limited sensory input our Tello has. Black and white camera in the middle is not able to measure height and is used only for position. The two IR LED are in my opinion just as a lightning for the camera in closer distance to be able to recognise detail for example if landing in your hand. IR on sunny day would work at maximum distance of about 10-15cm - the distance our Tello recognise obstacles.
So My assumption is that Tello computes the height based on gyro and accelerometer input. That means it will fly as far as the output of these two is equal to 30m, than it will stop. It is also the only way of calculating height with the limited sensory input our Tello has. Black and white camera in the middle is not able to measure height and is used only for position. The two IR LED are in my opinion just as a lightning for the camera in closer distance to be able to recognise detail for example if landing in your hand. IR on sunny day would work at maximum distance of about 10-15cm - the distance our Tello recognise obstacles.