HEX Cube - Pre-Arm Safety Checks; LED Meanings; Arming the Vehicle; Arming Methods

Copter includes a suite of Pre-arm Safety Checks which will prevent the vehicle from arming if any of a fairly
large number of issues are discovered before take-off including missed calibration, configuration or bad
sensor data. These checks help prevent crashes and fly-aways but they can also be disabled if necessary.
In normal situation LED will blink blue or green. The LED will be flashing yellow if the flight controller
notice a pre-arm check failure.
If it is blinking yellow, please try to disarm. The failure messages will be shown in the HUD window.
Solve the error according to the failure message shown.
Detailed failure messages and solutions can be found on the Ardupilot official website: http://ardupilot.
org/copter/docs/prearm_safety_check.html
If it is blinking blue or green, you may disarm. A low pitch tone will be emited from the buzzer. You will
see the motors start to rotate and ready to take off.
LED Meanings:
Flashing red and blue：Initializing sensors. Place the vehicle still and level while it initializes the
sensors.
Flashing blue：Disarmed, no GPS lock. Auto-mission, loiter and return-to-launch flight modes require
GPS lock
Solid blue：Armed with no GPS lock
Flashing green：Disarmed (ready to arm), GPS lock acquired. Quick double tone when disarming from
the armed state.
Fast Flashing green: Same as above but GPS is using SBAS (so should have better position estimate)
Solid green: with single long tone at time of arming: Armed, GPS lock acquired. Ready to fly!
Double flashing yellow: Failing pre-arm checks (system refuses to arm)
Single Flashing yellow: Radio failsafe activated
Flashing yellow - with quick beeping tone: Battery failsafe activated
Flashing yellow and blue- with high-high-high-low tone sequence (dah-dah-dah-doh): GPS glitch or GPS
failsafe activated
Flashing red and yellow：EKF or Inertial Nav failure
Flashing purple and yellow: Barometer glitch
Solid Red: Error，usually due to the SD card（re-plug or place the SD card to solve）,MTD or IMU，
you may check the SD card and have a look at BOOT.txt for boot message analysis
Solid red with SOS tone sequence：SD card missing or SD card bad format
No light when power on: No firmware，firmware lost，SD card missing or bad format（ac3.4 or
higher version）
Arming
The flight controller can be armed by GCS or remote controller.