2020-08-01, 09:17 AM
I tried another IMU today from another brand and on another Pi. Jumper wires and enough distance to the Pi, used no enclosure and tried recalibrating everything, but still bad fit. No interference and the power supply was well away from the Pi. I tried the calibration at home still so I don't know if it will have a better fit when performing real rounds on a boat. When comparing the compass readings to reality it did move in the right direction, but deviated between 20-50 degrees most times.
I also downloaded a compass app on my android phone to compare the test results. Also tested this by looking at the readings as I moved my phone closer to the metal enclosure, and indeed it interfered clearly. Readings scrambled a bit as it seemed to be going through a field, and when closed to the enclosure it returned to normal "isch". So, I'll get rid of the enclosure and revert to a PVC enclosure.
The "bad fit, using same as previous" notification is still something I want to understand more. I know more and better readings can result in 2d and 3d fix with more movement. So my question is, can this be accomplished by calibrating at home just by turning the IMU around it's own axis, or do you really need more range (on a boat).
I also downloaded a compass app on my android phone to compare the test results. Also tested this by looking at the readings as I moved my phone closer to the metal enclosure, and indeed it interfered clearly. Readings scrambled a bit as it seemed to be going through a field, and when closed to the enclosure it returned to normal "isch". So, I'll get rid of the enclosure and revert to a PVC enclosure.
The "bad fit, using same as previous" notification is still something I want to understand more. I know more and better readings can result in 2d and 3d fix with more movement. So my question is, can this be accomplished by calibrating at home just by turning the IMU around it's own axis, or do you really need more range (on a boat).