Despite the fact that you are stuck with older arducopter firmware, this is still a really neat flight controller. The small size makes it practical in situations the original APM was not and the price is good for what it is. My biggest complaint is the wiring, I had to do a lot of splicing and dicing to make everything work with my setup. It works great once you get everything setup and tuned though. There are plenty of youtube videos / websites about the APM, so it's easy to find solutions to common issues.I replaced a old APM 2.5 from 3DR with this and couldn't be happier. The form factor is much easier to work with and I'm already familiar with the configuration. It's almost a drop in replacement for the APM 2.5, except you will have to make cables for the 3DR power module, Telemetry/OSD, and possibly GPS. Once you get all the cables made, it works exactly the same. I just use this thing for Stabilize/Althold/Acro and it does that very well.Might be worth noticing that this APM does not work with latest ArduCopter 3.2.1, but rather with 3.2 only. It is a setback especially since it took me half of weekend to figure out why there is no real feedback from the board (compass, gyro, RC stuff not moving while plugged to USB). Once I updated to ArduPlane firmware and confirmed everything works, I was able to single out the firmware as a problem.Easy to set up, build quality looks and feels solid. I have everything all hooked up and ground tested, now for a maiden flight! I am impressed so far1Everything is as advertised except the barometer is very glitchy and will not hold altitude. Vibration levels are well within acceptable limits, but the baro will still put out very large spikes.After some days of test I have return the board to HobbyKing.
The board after a while became extremely hot , around 60 Celsius
I add a little heat disspator on the two IC between the Usb port and the reset button and solve partially the problem but the board was very difficult to tune .
I had to always to trim a lot at each flight, there were oscillations impossible to eliminate with PID tuning.
Alt Hold did not work well even if there was a low vibations level, but the baro test report 42Celsius while the room temp was 19, do not know if that affects Alt Hold.
Then the compass stop to work and I decide to return the board.
My quad was a 250 mm class with 5040 props and a AWU weight of 170 - 230 grams (with Mobius camera).
I have mount on the same frame and setup a standard APM board and if flew perfectly without any tuning at first try.
It might be my unit with problems but I was deceive by the board quality.
If you purchase this product you should remember that the last version of APM firmware that can be load on a 8 bit board is the 3.2.1.
Some spare extra connectors and cables would be welcome .
Piece of garbage. Many QC issues apparent in this FC which of course affect it's performance. Not fit for purpose as advertised.This is my second APM board. Up graded from Naza32 to this on my 250 quad. Love how locked in this seems to be compared to the naza. This is a great value for all the feature this board has to offer.I have two of these boards purchased on separate occasions. Both have problems. First one generates a lot of glitches on the barometer and other sensors, it can function in stabilize mode but not loiter, I suspect a bad barometer. Second unit will not do an initial calibration, sporadically will not connect to USB, and is unuseable. This makes three bad APM clones from Hobbyking, the first one was a different model which had poor solder joints on the USB which detached and destroyed the board.much better than my old crius v1, my deadcat flyes great with this
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