Radiolink Electronic Ltd
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9. Raise the throttle to take-off.
If you leave the throttle at minimum for 15 seconds while in any of the above modes the motors will
automatically disarm.
It means the drone have failed to disarmed when you heard a long sound like D~~~~.
You can connect the PIXHAWK to computer and check the reason.
RC failures (i.e. transmitter/receiver failures):
RC not calibrated : the radio calibration has not been performed. RC3_MIN and RC3_MAX must have been
changed from their default values (1100 and 1900), and for channels 1 to 4, MIN value must be 1300 or less,
and MAX value 1700 or more.
Barometer failures:
Baro not healthy: the barometer sensor is reporting that it is unhealthy which is normally a sign of a
hardware failure.
Alt disparity: the barometer altitude disagrees with the inertial navigation (i.e. Baro + Accelerometer) altitude
estimate by more than 2 meters. This message is normally short-lived and can occur when the flight
controller is first plugged in or if it receives a hard jolt (i.e. dropped suddenly). If it does not clear the
accelerometers may need to be calibrated or there may be a barometer hardware issue.
Compass failures:
Compass not healthy: the compass sensor is reporting that it is unhealthy which is a sign of a hardware
failure.
Compass not calibrated : the compass(es) has not been calibrated. the COMPASS_OFS_X, Y, Z
parameters are zero or the number or type of compasses connected has been changed since the last
compass calibration was performed.
Compass offsets too high: the primary compass’s offsets length (i.e. sqrt(x^2+y^2+z^2)) are larger than
500. This can be caused by metal objects being placed too close to the compass. If only an internal compass
is being used (not recommended), it may simply be the metal in the board that is causing the large offsets
and this may not actually be a problem in which case you may wish to disable the compass check.
Check mag field: the sensed magnetic field in the area is 35% higher or lower than the expected value. The
expected length is 530 so it’s > 874 or < 185. Magnetic field strength varies around the world but these wide
limits mean it’s more likely the compass calibration has not calculated good offsets and should be repeated.
Compasses inconsistent: the internal and external compasses are pointing in different directions (off
by >45 degrees). This is normally caused by the external compasses orientation (i.e. COMPASS_ORIENT
parameter) being set incorrectly.
GPS related failures:
GPS Glitch : the GPS is glitching and the vehicle is in a flight mode that requires GPS (i.e. Loiter, PosHold,
etc) and/or the circular fence is enabled.
Need 3D Fix : the GPS does not have a 3D fix and the vehicle is in a flight mode that requires the GPS
and/or the circular fence is enabled.
Bad Velocity: the vehicle’s velocity (according to inertial navigation system) is above 50cm/s. Issues that
could lead to this include the vehicle actually moving or being dropped, bad accelerometer calibration, GPS
updating at below the expected 5hz.
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