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+--- Thread: How to safely shut down the TinyPilot, Rudder feedback, and compass calibration (/showthread.php?tid=2856)
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RE: How to safely shut down the TinyPilot, Rudder feedback, and compass calibration - seandepagnier - 2020-08-26
the age resets yes. Did you hold the sensors on each side? It looks like it worked for the accels and you have bias of 0.2 so you definitely needed to calibrate them. Some mpu9255 are factory calibrated but not all, and some have such large biases that they saturate in the +- 2g range, so either a lower range is needed or better to use a different sensor (I throw away ones with more than 0.3 bias) so yours are ok, but you needed to calibrate them.
It may be your compass sensors are bad or there is interference. It is difficult to say without the plot. Your biases are still all zero so it didn't calibrate. The plot is portable python but I have only run this under linux maybe it can run on windows. I do not use the windows operating system since windows 98 back in 1999.
The new tinypilot image has improved calibration and it may succeed, however, the opencpn pypilot plugin needs to be recompiled. I suggest you try with openplotter so you can use the calibration plot.
RE: How to safely shut down the TinyPilot, Rudder feedback, and compass calibration - htwt - 2020-08-26
(2020-08-26, 01:11 AM)seandepagnier Wrote: the age resets yes. Did you hold the sensors on each side? It looks like it worked for the accels and you have bias of 0.2 so you definitely needed to calibrate them. Some mpu9255 are factory calibrated but not all, and some have such large biases that they saturate in the +- 2g range, so either a lower range is needed or better to use a different sensor (I throw away ones with more than 0.3 bias) so yours are ok, but you needed to calibrate them.
It may be your compass sensors are bad or there is interference. It is difficult to say without the plot. Your biases are still all zero so it didn't calibrate. The plot is portable python but I have only run this under linux maybe it can run on windows. I do not use the windows operating system since windows 98 back in 1999.
The new tinypilot image has improved calibration and it may succeed, however, the opencpn pypilot plugin needs to be recompiled. I suggest you try with openplotter so you can use the calibration plot.
Yes I hold the sensor each 6 side.
I ordered a Raspberry Pi 4 and have to wait for it to arrive. Then I can use openplotter.
I also ordered more MPU-9250 boards. Can I use ICM-20948 directly? I looked for no difference other than the I/O voltage(?) Needs voltage level translator like TXS0108E. https://invensense.tdk.com/wp-content/uploads/2018/10/AN-000146-v2.0-TDK_Migration_MPU_9250toICM-20948.pdf
RE: How to safely shut down the TinyPilot, Rudder feedback, and compass calibration - seandepagnier - 2020-08-27
I ordered one also for testing. I don't think you can use it until the software supports it.