A carbon case box was added to hobbyking last night for the apm 2.5. Carbon-fiber is conductive and does deflect/obsorbe 2.4ghz so i wonder if this would provide any mag shielding ?
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A carbon case box was added to hobbyking last night for the apm 2.5. Carbon-fiber is conductive and does deflect/obsorbe 2.4ghz so i wonder if this would provide any mag shielding ?
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If you want to do magnetic shielding you'll need a metal with a high magnetic permeability. MuMetal is the brand name. Electronic Goldmine had some generic stuff a few times over the last few years. I can't find it now but I also didn't look very hard.
That said, has anyone else actually tested, plotted, and quantified the effects of motor on magnetometer? Besides me that is ;) I only did it for a brushed motor running 20A and saw negligible effect at 5" distance.
Arghh, too ugly!
It would be convenient to apply an anti vibrating solution in the case. This would be a cool PNF case.
The original case is way better and even less expensive. The only thing that could convince anybody to buy it, is because ordering one case from 3DR when buying from HK would have no sense. That is why they will sell a few pieces of this less perfect glass fiber case. In the end it's better than nothing.
I really see no benefit of that construction. I wonder what idea stood behind that.
no foam to cover the barometer...
Leave this bad piece of copying at hobbyking.
Actually regarding magnetometer, doesn't really make much difference if it is carbon fibre or not (although this almost certainly isn't.
The primary problem with the magnetometer is radiated DC electromagnetic field IE electromagnet made from DC power circuitry, wiring and batteries on Copter / Plane.
If this was carbon fiber (or aluminum) it would provide some protection from AC EMF but not DC and in fact since the DC earth magnetic field is what we want to pick up with the magnetometer, that is actually a good thing.
A mu metal or similar box will do a superb job of shielding the flight controller from all spurious DC magnetic fields, unfortunately it does a superb job of shielding the magnetometer from the Earths magnetic field too.
Basically the best thing to do is get the magnetometer as far away from your copters DC magnetic field as possible and to do what you can to reduce that field in the first place (4 in one ESC for instance).
NO holes for GPS, PM and I2C
If it shielded, how would the compass be able to work?
Earl
Gold leaf cover it and then ground it. That should help quite a bit.
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