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switch to AUTO mode after arming

Hi,

run into a problem: unable to switch to AUTO mode after arming the motors.

for example, first set to "Stabilize", then arm the motors, now UNABLE to switch to auto mode.

Am I doing something wrong? am I missing anything?   ( mine is apm3.3, have tri

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ERROR COMPASS VARIANCE

Hi all,

I'm having trouble calibrating my compass on my quadcopter. I'm using an external GPS/compass that I got from China (not 3DR brand). It's attached via a mast to a Pixhawk clone, which I think has the newest firmware (I just updated it on Sun

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PLS HELP with guided mode !

can some one help me with those issue pls ?

arducopter 3.3.3 / pixhawk

after

    msg11.target_system=1;
    msg11.custom_mode=4;
    msg11.base_mode=MAV_MODE_FLAG_CUSTOM_MODE_ENABLED;
mavlink_msg_set_mode_encode(1,1,&buff,&msg11);
mavlink_finalize_message(&

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APM V2.6 Unable to Connect

I have a problem with my APM V2.6. When ever I try to connect to it i get the following message. "No Heartbeat Packets Received." 

Iv read through through a load of forums. I have tried the following:

  • Opening mission planner before connecting the APM
  • Op

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X8 prop layout and control

I'm considering building an X8.

From what I understand so far, on a given arm, the top and bottom prop rotate in opposite directions - note I'm meaning the props themselves; the motors rotate in the same direction, but the lower motor is upside-down.

I

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APM 2.5 pinout

So I messed my FMU on my APM and no longer will use it as a flight controller.

I im going to end up using the APM for arduino projects im working on. Does anyone have an easy to read pinout for the AT2560 to APM layout?

I know of this schematic but im

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APM antenna tracker

How fast can the APM antenna tracker track the plane? I guess I am asking because I do have an FPV plane that can maintain speeds over 120MPH. I am sure if its far enough away its no problem, but what about high speed passes? Can it keep up then?

Than

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