I think my IMU is failing...
Out for the race across the bay with Pypilot replacing my fluxgate compass that got fried when lightning hit the boat on the trailer to our port.
We had a great start !!
https://photos.app.goo.gl/YuLzfTDcHdouZKwc9
and the Pypilot compass and GPS USB dongle were feeding the Signal K dashboard with Mag heading, COG, SOG and yaw pitch and roll. Everything is great, the Amazon Fire tablet running VNC is in a waterproof case strapped on top of the old Nexus instruments on the mast. We took 2nd in the Spin B fleet!
I pulled the PI and the Fire from the boat took it home to recharge the batteries. Next day the pi and IMU and GPS all in its water proof case is remounted on the velcro dots on bulkhead and we set off for the next days racing. About halfway through the race the new compass starts swinging radically and is not useable at all. When we get in and the boat is back on the trailer and everyone is inside with something warm to drink, I pull up the SignalK Scope and get some screen shots from the Fire.
The boat is facing north and suddenly the compass shows we turned to 159 degrees.
Screenshot_2020-02-02-15-58-47
11 seconds after that, the compass reads 150 degrees
Screenshot_2020-02-02-15-58-58
The erratic readings continue and the compass calibration globe rotates wildly on all three axis ( partially covered in this pic. ) Finally settling back to 350 degrees. ( I may have locked the calibration in the last screen trying to stretch the window)
Screenshot_2020-02-02-15-59-45
Is this the symptom of a bad IMU or is there something else going on. The weather in in the low 60s both days.
Thx
Out for the race across the bay with Pypilot replacing my fluxgate compass that got fried when lightning hit the boat on the trailer to our port.
We had a great start !!
https://photos.app.goo.gl/YuLzfTDcHdouZKwc9
and the Pypilot compass and GPS USB dongle were feeding the Signal K dashboard with Mag heading, COG, SOG and yaw pitch and roll. Everything is great, the Amazon Fire tablet running VNC is in a waterproof case strapped on top of the old Nexus instruments on the mast. We took 2nd in the Spin B fleet!
I pulled the PI and the Fire from the boat took it home to recharge the batteries. Next day the pi and IMU and GPS all in its water proof case is remounted on the velcro dots on bulkhead and we set off for the next days racing. About halfway through the race the new compass starts swinging radically and is not useable at all. When we get in and the boat is back on the trailer and everyone is inside with something warm to drink, I pull up the SignalK Scope and get some screen shots from the Fire.
The boat is facing north and suddenly the compass shows we turned to 159 degrees.
Screenshot_2020-02-02-15-58-47
11 seconds after that, the compass reads 150 degrees
Screenshot_2020-02-02-15-58-58
The erratic readings continue and the compass calibration globe rotates wildly on all three axis ( partially covered in this pic. ) Finally settling back to 350 degrees. ( I may have locked the calibration in the last screen trying to stretch the window)
Screenshot_2020-02-02-15-59-45
Is this the symptom of a bad IMU or is there something else going on. The weather in in the low 60s both days.
Thx