When I turn on my TP H after it locks on GPS and I start to preflight, the ST 16 shows +.5 ft +- .2' or so. The moment I take off, the altimeter jumps to -21', causing the drone to lurch upwards and become very/very slow to descend at a higher altitude than usual... This happened repeatedly after 4 land reboots, and 2 attempts at calibrating both GPS and Accelerators. The sponges and foams are all in place on the Mainboard and over the sensors. I know the baro's are pretty basic, but seems odd that there would be such great variation, especially right after takeoff, always negative as well.
Winds were only about 4-5 mph max gust and it was a nominal 89 degrees, any ideas on improving this altimeter error? I know some have siad in the thread that+- 30' ins normal, I never had that kind of variability in several other controllers, the way this acts it is almost like the drone is causing the pressure changes...
Maybe a result of the magnetic storms? *joking*
I am currently experiencing this issue with one of my aircrafts.
Not every flight, but some times I have this, unusual, aparently altimeter related problem. Reviewing the telemetry data I can see that shortly after taking off the altimeter logs are far on the negative side after take-off when this has happened. I check hardware monitor and stick output regularly, before every flight session, so this is not (in my case) a ground station hardware issue.
Flight behavior can be described as: a tendency to slowly keep ascending immediately after take off and a slow descent rate, although at full negative throttle (hare rate)
the aircraft lands without issues. In my experience, after a few seconds it normalizes and everything continues normally.
I have only seen this immediately after take off. After I first experienced this a compass calibration seemed to fix the issue, however on later flights accel/compass calibrations don't seem to do much.
It can be very uneasing the first time this shows up, but up to now it has been just a nusiance, but definitely something I am keeping an eye open for.
I still haven't seen a pattern to when this happens: I have flown 4 batteries one right after another without this issue showing up. And other times I've experienced this on the very first flight and nothing on the rest. However this only happens to one of my aircrafts, so I'm leaning towards the faulty altimeter hypothesis.
Here are the altimeter graphs for my last 5 flights (all on the same session)
- Flight #1 and #2 went completely normal
- Flight #3 and #4 I immediately noticed the odd behaviour and decided to abort flights and run accel/compass calibrations.
- Flight #5 Issue was significantly reduced, after a few seconds hovering normalized and the rest of the flight went normally and uneventful.
Here is the actual footage of aborted flights #3 and #4:
Good to know I'm not the only one experiencing this.
Greetings!