"I had the same problem with my PixHawk on a FlameWheel 450.  I used Mission Planner to turn of the internal compass and all of my compass variance errors went away. Any time your auto pilot is anywhere near high current lines you are susceptible to…"

"John, Yes that should work fine.  The input resistance to the 3904 inverter is 2.2Kohms so the load current seen by your Arduino high output should only be about 1.5ma.  Let me know how it works out.
   Doug
jjvb said:
Doug,

Regarding your Runcam…"

"Tyler,
I don't see anything fundamentally wrong other than you were flying in Stabilize mode with a significantly over powered craft.  As such, you are controlling the copter altitude manually with the throttle and small inputs can cause large…"

"Jason,
Do you have your telemetry running?  If so, you can monitor a host of parameters in real time on Mission Planner.  You right-click on the heads up display and select "User Items."  Check the parameters you want to view and they will be…"

"Does Mission Planner give you the option of clearing your data log files?  If so, try that.  If there is no SD card to pop out, I'm not sure how do erase it.  There must be a way though.   I found some other posts that claim you can clear the flash…"

"You are right - there does not appear to be a data flash card port on APM2.8.  You may have a bad board....  I don't know how to reset or reformat the onboard flash memory.  If you can, it will probably be through the mission planner interface.…"

"Here is what the screen should look like (see attachment).    Pop out your flash card and put it in your  computer to make sure that it is functioning OK.  Myself, and others on this forum, have had problems with bad flash cards.  If it is not…"

"Jason, 
Clifton nailed it.  You don't need a radio to download the data logs, in fact it only works using the USB cable connection to mavlink.  Follow the directions in the link above and you should be able to download the log no problem.  Then…"

"Jason, What is the hover current?  For a copter of your size and weight I would not expect it to be more than 12-13 amps with a 3S battery.  If you are hovering at just over 50% with the weight of a 5000mah battery on a 450 frame, then you are in…"

"For this issue, you just need the basic data logging.  This page tells you how to use dataflash logs and how to change the bit mask. http://ardupilot.org/copter/docs/common-downloading-and-analyzing-d...
You are going to want Current and Ctune as a…"

"Jason,
Can you post a data log of the copter while hovering.  You did not say what FMU you are using, but if it is a Pixhawk or something similar, you should be able to download a data log that the community can look at.  That is the best way to…"

"Definitely under powered.  I am running a flamewheel 450 with DJI 2312E 960kv motors and 9450 props, same battery and similar overall weight.  It hovers at under just 50% throttle. 
  Doug"

"Mike,
The switch inside the Runcam has four solder legs on it; the front two (closest to the lens) are in parallel and connected to the signal line on the PC board.  The rear two are also in parallel and connected to ground.  If you wanted to hack…"

"I had a problem with my Pixhawk flash card early on as well.  It worked for a while, then it stopped recording log files.  Turned out to be a bad card as mentioned above (I also had a knock-off pixhawk).  I read some other posts about these cheap…"

"I absolutely agree with Clifton.  Had I let the test run to completion (which would be the case if the transmitter really had failed) the copter would have landed and everything would have been fine.  Aborting the test is what created the crash…"

"Rich,
I had disabled the switch checks already, but I think I like your suggestion better to leave all the checks on and just hit any button on startup to override the checks.  That makes more sense to me.  I also thought about making Pos Hold the…"