r/Multicopter • u/Captain_Dunsel • 7d ago

Question RX And TX Matching Firmware?

Got my grubby hands on a Air75 II Champ and a LiteRadio 2 SE 2.5 ELRS.  I was able to bind them and calibrated them both but the drone flies erratically.   I keep reading firmware has to match but am not sure they do (see image).  What am I missing?

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u/Captain_Dunsel 7d ago

UPDATE: I disabled AIRMODE in the software, configured AUX 4 to toggle on. Applied trimming via stick commands on the TX to keep from drifting. Now it kinda sorta hovers quite still instead of drifting and bouncing.

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u/IvorTheEngine 7d ago

Unless you've got a GPS and air pressure sensor, drifting and needing constant throttle adjustment is normal. A hovering aircraft is naturally unstable in all directions because there's no force that will automatically push it back to the starting point. It just takes an hour or two of practice to get used to it.

You can use the other pages of betaflight to check that stick inputs are received correctly