What sensors should be equipped with a heavy quadcopter?

Question

Sensors

I'm building a quadcopter. The base has already been assembled and tested, I am waiting for the propellers and I will launch it.
Now the question arose with what sensors it is necessary to equip it (I want full stuffing).
Now I'm going to add ultrasonic range sensors to it for self-landing and takeoff, an accelerometer, a barometer, a gyroscope and a compass. Well, I'll screw it up later.
What else is there? What did I forget?

Answer 1

for flight it will most likely be useless, but for yourself and reporting still a hall sensor for the exact number of engine revolutions and engine temperatures.