Posted by Eric Tamme on December 10, 2009 at 9:24am
So these questions may be bit a daft, but why do all the IMU's have 3 accelerometers on them?I just picked up a memsic 2125 dual axis sensor from radio shack for $30. Wouldnt 2 of these give you "4 axis" of angle input (roll+pitch+yaw+... 1 extra)I've also heard talk that the ArduPilot cant handle the processing required for the IMU and then the nav also. What processing goes into reading the IMU (sorry i know im being lazy.. i could just look at the code). The readings from memsic chip seems to be pretty stable.. just summing a small sample (5-10) and shifting the result.im new to arduino stuff.. so bear with me, im just curious, It seems a very simple stabilization unit could be made from 2 of these memsic chips and a small amount of code. It seems too simple.. i must be missing some thing ;)
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shake it and see what happes to the data.....put it in a steady state turn and see what happens.....There are a lot of physics that have to be accounted for. On the bench accelerometers work great as leveling devices but if they are moving or linearly acceleration (IE flying) they get confused as to where ground is.
Which is why you use gyros to help them out. Research Kalman filter or DCM. Not as clear cut as one might seem but still quite doable
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Which is why you use gyros to help them out. Research Kalman filter or DCM. Not as clear cut as one might seem but still quite doable