ACRO bug (fixed in 2.9.1b): while doing flips in ACRO mode, if you switch to Stabilize while inverted your throttle will go to minimum. To regain throttle control you need to switch back to ACRO then back to Stabilize again (i.e. switch to stabilize twice). You never lose control of roll/pitch/yaw.
Loiter/AltHold/Auto/RTL bug: if you switch into these modes with throttle at zero motors will go to minimum until you raise the throttle.
Auto mode altitude bug (fixed in 2.9.1b): setting a waypoint altitude greater than 320m over home altitude may wrap around and instead be interpreted as a low altitude.
ArduCopter 2.9 is now in the mission planner and the downloads area!
The major improvement is we use inertial navigation to improve altitude hold. This increased reliance on the accelerometers means you must do some additional set-up before flying:
3. If upgrading from 2.8.1, modify the throttle and altitude PID values:
Here is the list of major changes (a more detailed list can be found in the release notes):
As per usual PIDs are optimised for the 3DR/jDrones quad with 850 motors and 10" props. If you're using more powerful motors/props and are seeing bad flight behaviour in stabilize, start by turning down Rate Roll P in 25% steps.
Special thanks to our testing team lead Marco and the dedicated bunch on the 2.8.1 release thread who put their copters at risk while testing the pre-release version. Some of their videos are here: 1 2 3 4 5 6 7 8
Please feel free to report issues you find in the discussion below and/or add them to the issues list.
You are a gem. Thanks for all your help and timely replies. APM is a neat place to be in these exciting times...
I don't want to go OT in this thread, 5.5V is fine, but seems a tad high for a 5V BEC which should peak at 5.25V, replacing the MUX chip should fix it.
I assumed you meant roughly 5.5V, in this case, NO!! DO NOT CONNECT THAT BEC to the input headers of APM 2.5 just asking for trouble, that is what has caused your MUX to fry IMHO, you can use that 5.5 BEC on the ESC headers with JP1 installed as the Diode and Fuse on APM 2.5 ESC Input will drop that 5.5V by 0.7 V down to 4.8V which should be just right to power APM 2.5. Remove the RED wire from ESC BEC.
oh well now there you have it .....guys don't believe the absolute max values ....
i will replace the mux as soon as mr rs components courier rocks up with them,
if i wanted to connect using uart 2 would i need to set somthing in the fw first or will the solder jumpers do the job,
maybe i can atleast connect via telemetry.....
I have some code that can work out what all the correct coefficients for roll, pitch, yaw, and throttle for any combination of motor positions relative to the CG. It is Matlab and I am happy to enter the positions and send you the results if you give me them or send you the code if you have access to Matlab.
So how many satellites are we all getting?
For me its 8 or 9 for 95% of the time, given a few minutes, with an average hdop of about 1.5. In one guys post I think he had 12 while hovering in the basement!
Are there fewer visible, on average, at higher latitudes?
I need some help please.
My Quad is flying well, except for one thing. The trottle is way too jumpy. one click up and it rises, lower by one click and it falls. This makes for a very uneven flight.
What parameters do I need to tune?
You should never be trying to fly any multi rotor or helicopter with an airplane radio with a ratchet throttle. You want a helicopter radio that has a smooth throttle.
Most transmitters can be converted to a helicopter type throttle. The guys at the RCG radio forum had help with your particular brand of transmitter. http://www.rcgroups.com/radios-135/
Where is your throttle? It your stick is about 50-60% during hover then it is just right. If it’s below 50% slightly smaller or lower pitch props will make it easier to fly.