LEDs Meaning¶
This topic explains how to interpret the colours and flash sequence of
the main and/or external LED(s), if the NTF_LED_OVERRIDE parameter is set to its standard default setting. Some of the LED patterns have associated sound/tone
patterns as listed in Sounds (Pixhawk).
Boards with 1 or 2 Notify LEDS¶
These boards have one(LED A) or two(LED A and LED B) leds on the board, normally, but not always, green and blue, respectively.
After boot, LED A usually shows system status, while LED B shows GPS status. Each sequence of flashes shown below repeats every second. So, LED A will flash with a 50% duty cycle at 4Hz , alternating with LED B, when the autopilot is in ESC calibration mode.
The states and events are shown in order of precedence. For example, LED A will flash the battery failsafe sequence even if RC is in failsafe also, in the two LED case.
STATE |
LED A |
LED B |
|---|---|---|
Initializing (calibrating gyros,etc.) * |
|
|
Save Trim or ESC Calibration |
|
|
Compass Calibration |
|
|
AUTOTUNE:
Completed
Failed
|
  |
|
ARMED:
Battery failsafe *
RC or GCS failsafe
Readytofly(ARMED) *
|
   |
|
DISARMED:
pre-arm checks failing *
ready to arm *
|
  |
|
GPS:
No lock or No GPS
Lock (flashs = # sats/2)
|
not lit
 8sats |
* in the single LED case, only these indications are shown. The battery failsafe indication also is shown for GCS and RC failsafes.
RGB LEDS¶
The states and events are shown in order of precedence.
STATE |
LED |
|---|---|
Initializing (calibrating gyros,etc.) |
|
Save Trim or ESC Calibration |
|
Leak failsafe
EKF failsafe
GPS glitch
Radio/GCS/Batt failsafe
|
    |
ARMED:
3Dfix
No valid GPS fix
|
  |
DISARMED:
pre-arm checks failing
good DGPS fix *
good GPS fix *
bad GPS fix
|
    |
* GPS lock is shown only if position has become valid which requires more than just GPS lock
Video Overview¶
LED/Buzzer Meanings¶
Flashing red and blue: Initializing gyroscopes. Hold the vehicle still and level while it initializes the sensors.
Flashing blue: Disarmed, no GPS lock found. Autopilot, loiter and return-to-launch 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 - with rising tone: EKF or Inertial Nav failure
Flashing Red, Blue and Green: Copter ESC Calibration mode entered. See Electronic Speed Controller (ESC) Calibration
SOS tone sequence : SD Card missing (or other SD error like bad format etc.)