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+--- Thread: mpu 9255 not working correctly? (/showthread.php?tid=2562)
mpu 9255 not working correctly? - signalpresent - 2020-05-11
I apologize, if this has been discussed before.
I just received my second mpu9255 sensor, since the one before was faulty.
So I connected it to the rpi according to the manuals and it shows and I can calibrate (sort of) it using pypilot...
When I look at it in signal K instrumentpanel it only gives out pitch and roll... the yaw is blank... I fear that's not how it is supposed to do?
Also... the magnetic heading is not acting like I'd expect... the heading doesn't change according to how I am...
I must be doing something wrong, what might it be?
I'm a total beginner and appreciate feedback and help
Cheers
Roy
RE: mpu 9255 not working correctly? - Sailoog - 2020-05-11
The yaw is the heading, that is the expected behavior.
RE: mpu 9255 not working correctly? - signalpresent - 2020-05-11
Ah... that was obvious, thanks!
What do you think about the heading not changing according to how the sensor is turned/moved? Or is that just becaus I’m testing it indoors and there’s not enough movement?
Example.
When I walk towards north it shows correct direction, but when I turn and head in the opposite direction the heading changes about 20-30 degrees, not the expected 180.
I guess I’ll take the testbed outside and give it a try there also.
RE: mpu 9255 not working correctly? - Sailoog - 2020-05-11
Usually that means that your imu is not calibrated yet: https://openplotter.readthedocs.io/en/latest/pypilot/calibration.html
RE: mpu 9255 not working correctly? - signalpresent - 2020-05-11
Great! Thank you for the reply! I’m obviously too impatient.
RE: mpu 9255 not working correctly? - beercansailor - 2020-05-12
Today I was finally able to install a correctly working MPU9255. This is the fourth try, the other three were all broken one way or another. It appears there're quite a few inferior MPUs being sold.
Run the calibration. If you can complete that successful, you are probably good. Otherwise you may also have an inferior sensor.
RE: mpu 9255 not working correctly? - rilova1975 - 2020-06-29
Hello, I have an openplotter installation with a gps via usb and I send the data via ethernet to a computer. Now I would like to be able to send the information of an MPU9250 but although I have it calibrated I cannot send the information together with that of the gps.
I have it registered in PyPilot, and in signalk. But I have not managed to use the heading of the compass so that it comes out in OpenCPN or send it via UDP.