title_body: Barometer vs Rangefinder On a small 6-7inch drone do I need a barometer, rangefinder or both? Is there a standard practice or does it just depend on use case?
upvoted_answer: Technically, you don't need a rangefinder or a barometer for a normal drone but if you want to make a drone with altitude hold, I would recommend a barometer over a rangefinder because a rangefinder will not work very high up or when you are flying over certain surfaces like water. A rangefinder would only be good if you stay close to the ground and don't fly over reflective surfaces.