I just loaded up 2.4 in my APM 2.5+ and went through the calibration process and set the throttle parameters and am experiencing unexpected behavior for the throttle. When in manual mode, steering works as expected, albeit courser resolution, but throttle does not work correctly. When moving the stick forward, it jitters the wheels but does not move it. When moving the stick backwards for reverse, it only has one speed, fast. It didn't matter that I reversed the channel on the radio or MP, the behavior was the same.
If it helps, I'm using a Spektrum DX8 with an Orange 6 channel receiver. I made sure the truck was properly trimmed and the ESC was properly calibrated before adding the APM.
Any ideas? I had something similar happen last year when I tried using the APM 2560 and IMU last year using Traxxas radio gear but chalked it up to the radio.
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Okay, here's an update on the problem I had. I'm pretty sure I got it figured out.
DON'T use the 3DR power module to get power to your APM. I swapped out the motor, ESC, and receivers and none of that fixed the problem. I even changed radio systems and still had the issue. I then stuck my wattmater (Eagle Tree e-Logger) on it and found that this thing, even though it's just a brushed motor, will pull enough amps to mess things up. I shut down my e-Logger once (100A limit) when I pulled the throttle hard and stopped. I figured it could be the power module so once I removed that, it took care of the problem.
I now power the APM from an UBEC on 5V and then use the ESC BEC to power the servo at the normal 6V from the Traxxas ESC. J1 is not installed to accommodate this dual power setup.
Now, onto the next problem. I'll start a new thread for that.