Noisy barometer?

Navio / Edge Hardware
1

I made a test flight some time ago. Noticed a strange behavior of the altimeter - sporadically changing altitude and a bit of a noise in the data. Reviewed the log and I see a lot of spikes in the altitude graph - most of them are going down to -400 meter, some go high several thousand meters. Result is that I receive error position vertical variance or similar.
What could be the problem? I had such problem from the beginning since I received the board (Navio2), but was not so often. Now it becomes worse. With that noise in the readings, my copter would crash some day I guess…
Attached is the log file.
2016-11-04 14-15-43.bin (7.6 MB)

2

@toncho did you cover the baro with a foam? Could you please share a photo of your setup?

3

It is covered, yes. Black foam to repell any light.
Here is my setup - Compass, heading and yaw performance problems

4

Do this happen when copter is on the ground?

Could you please run the baro example (when ArduCopter is not running) and see if the problems occurs too:
https://docs.emlid.com/navio2/Navio-dev/barometer-ms5611/

5

It happens all the time. When on the ground, it accumulates a small error in the value - when such spike occurs, it changes the altitude rapidly by two or three meters. I guess, it would compensate this error during flight by altering the current altitude. I have not checked the log for the GPS readings.
I cannot perform this test right now, will keep in touch.

6

We had same issue. Its because Navio2 UART port cause a some kind of interference to barometer. Use USB port to plug telemetry instead of UART port.

7

@toncho

Hello there! Any update, progress or tips on this one?

8

Also interested. Our next build is not using uart. But I’ll pay more attention to baro data. We have a clean pressure reference inside brainbox with no foam required.

9

[quote=“Amila, post:6, topic:4504, full:true”]
We had same issue. Its because Navio2 UART port cause a some kind of interference to barometer. Use USB port to plug telemetry instead of UART port.
[/quote]Would you explain how, please? I have never used the USB ports… :innocent:

10

I decided to not use this board anymore. Sorry, guys, a good idea, but there is still a lot to work on. For now, I am flying with a pixhauk and do not have any issues.
Nothing personal!