Tune/Sound Meanings

Pixhawk-series flight controllers use audible tones/tunes and LEDs to indicate vehicle state and events (e.g. arming success and failure, low battery warnings).

The set of standard sounds are listed below.

:::note Developers: Tunes are defined in /lib/tunes/tune_definition.desc and can be tested using the tune-control module. You can search for tune use using the string TUNE_ID_name(e.g. `TUNE_ID_PARACHUTE_RELEASE) :::

Boot/Startup

These tunes are played during the boot sequence.

Startup Tone

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• microSD card successfully mounted (during boot).

Error Tune

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• Hard fault has caused a system reboot.

• System set to use PX4IO but no IO present.

• UAVCAN is enabled but driver can't start.

• SITL/HITL enabled but pwm_out_sim driver can't start.

• FMU startup failed.

Make File System

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• Formatting microSD card.

• Mounting failed (if formatting succeeds boot sequence will try to mount again).

• No microSD card.

Format Failed

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• Formatting microSD card failed (following previous attempt to mount card).

Program PX4IO

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• Starting to program PX4IO.

Program PX4IO Success

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• PX4IO programming succeeded.

Program PX4IO Fail

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• PX4IO programming failed.

• PX4IO couldn't start.

• AUX Mixer not found.

Operational

These tones/tunes are emitted during normal operation.

Error Tune

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• RC Loss

Notify Positive Tone

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• Calibration succeeded.

• Successful mode change.

• Command accepted (e.g. from MAVLink command protocol).

• Safety switch off (vehicle can be armed).

Notify Neutral Tone

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• Mission is valid and has no warnings.

• Airspeed calibration: supply more air pressure, or calibration complete.

• Safety switch turned on/disarmed (safe to approach vehicle).

Notify Negative Tone

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• Calibration failed.

• Calibration already completed.

• Mission is invalid.

• Command denied, failed, temporarily rejected (e.g. from MAVLink command protocol).

• Arming/disarming transition denied (e.g. pre-flight checks failed, safety not disabled, system not in manual mode).

• Reject mode transition.

Arming Warning

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• Vehicle is now armed.

Arming Failure Tune

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• Arming failed

Battery Warning Slow

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• Low battery warning (failsafe).

Battery Warning Fast

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• Critical low battery warning (failsafe).

GPS Warning Slow

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Parachute Release

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• Parachute release triggered.

Single Beep

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• Magnetometer/Compass calibration: Notify user to start rotating vehicle.

Home Set Tune

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• Home position initialised (first time only).

Power Off Tune

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• Vehicle powering off.