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+--- Thread: calibrate roll and pitch (heeland pitch) (/showthread.php?tid=4018)
calibrate roll and pitch (heeland pitch) - FabianT - 2022-04-29
Hi,
how can I calibrate roll and pitch? When I level my pilot, the roll axis is shown as pitch. Further the MPU is not mounted in line with any of the boat axis. Since I read the data into opencpn and would use heel as input for more correct TWA calculation it would be good if that heel is correct.
//Fabian
RE: calibrate roll and pitch (heeland pitch) - ironman - 2022-04-30
(2022-04-29, 06:42 PM)FabianT Wrote: Hi,
how can I calibrate roll and pitch? When I level my pilot, the roll axis is shown as pitch. Further the MPU is not mounted in line with any of the boat axis. Since I read the data into opencpn and would use heel as input for more correct TWA calculation it would be good if that heel is correct.
//Fabian
If you really need proper roll and pitch, I guess for now you'd need to reorient the IMU. See this thread https://forum.openmarine.net/showthread.php?tid=2946&pid=17922#pid17922
RE: calibrate roll and pitch (heeland pitch) - seandepagnier - 2022-05-01
(2022-04-29, 06:42 PM)FabianT Wrote: Hi,
how can I calibrate roll and pitch? When I level my pilot, the roll axis is shown as pitch. Further the MPU is not mounted in line with any of the boat axis. Since I read the data into opencpn and would use heel as input for more correct TWA calculation it would be good if that heel is correct.
//Fabian
pitch and roll cannot be distinguished without setting the heading offset. Try adding or subtracting 90 from this.
RE: calibrate roll and pitch (heeland pitch) - FabianT - 2022-05-04
(2022-05-01, 12:28 AM)seandepagnier Wrote:(2022-04-29, 06:42 PM)FabianT Wrote: Hi,
how can I calibrate roll and pitch? When I level my pilot, the roll axis is shown as pitch. Further the MPU is not mounted in line with any of the boat axis. Since I read the data into opencpn and would use heel as input for more correct TWA calculation it would be good if that heel is correct.
//Fabian
pitch and roll cannot be distinguished without setting the heading offset. Try adding or subtracting 90 from this.
Thanks. Certainly, I get pitch and roll correct setting this offset. About calibration: Will it do some "3d calibration" if I try to heel/pitch the boat? Like tacking in waves etc?
//Fabian
RE: calibrate roll and pitch (heeland pitch) - seandepagnier - 2022-05-04
yes, tacking while heeling works to perform a 3d compass calibration. It is only needed to give accurate heading while heeled.