Hi there,
When the tello is on and I look at the two black sensors on the underside of the tello only one is lit red. Shouldn't both of the sensors be on/red?
Regards/Nader
I think that it is a "flight time sensor". One sensor send a infrared light pulse against the ground and measures the time needed to reach the non-iluminated sensor. Knowing the time to reach the ground and again to the tello it is possible to deduce the altitude.
