Quaternion data uses barometer data?

[AllDigital33]

Hi Kris,

I am using the EM7180 on a model rocket to measure tilt and acceleration. I submitted an issue previously about the 10K foot altitude limitation in the barometer, due to the way the commercial version only uses one register.

I think I may be running into a related issue, but I'm not sure. I am using quat data to determine pitch/roll for tilt measurement, generated off of linear z. This works great, but when the rocket gets to about 14K feet linear z and roll values go haywire, but the raw x,y,z values seem to be fine. I assumed my rocket was in a tumble at high altitude, but I flew this weekend with another accelerometer and a camera and realized it was bad data coming off the EM7180.

Then I saw another (recent) issue indicating the quat filters required the baro to startup. Is it integrating the baro data into the quat data? That would explain my issue.

Thanks!!

[kriswiner]

I don't think the baro and accel are mixed in the stock EM7180 firmware, so I am not sure what would have happened here. Maybe Greg has an idea? It is possible to correct the altitude limitation but this would take some work on Greg's part and I expect he would want to get paid for it; he is the firmware developer for this device.

…

On Mon, Dec 7, 2020 at 7:35 PM AllDigital33 ***@***.***> wrote: Hi Kris, I am using the EM7180 on a model rocket to measure tilt and acceleration. I submitted an issue previously about the 10K foot altitude limitation in the barometer, due to the way the commercial version only uses one register. I think I may be running into a related issue, but I'm not sure. I am using quat data to determine pitch/roll for tilt measurement, generated off of linear z. This works great, but when the rocket gets to about 14K feet linear z and roll values go haywire, but the raw x,y,z values seem to be fine. I assumed my rocket was in a tumble at high altitude, but I flew this weekend with another accelerometer and a camera and realized it was bad data coming off the EM7180. Then I saw another (recent) issue indicating the quat filters required the baro to startup. Is it integrating the baro data into the quat data? That would explain my issue. Thanks!! — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#69>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABTDLKRQIMNPSKIU42GBJLTSTWNJNANCNFSM4URLV4NA> .