Anyone knows how to play an alarm using Mavlink?

Josephjj · February 21, 2021, 6:46pm

Anyone tried to buzz your buzzer using mavlink? I like to create a simple buzz to alert people when landing.

Anyone done anything like this before?

peterbarker · February 21, 2021, 11:02pm

Consider using an onboard LUA script in place of a mavlink command.

If you decide to go with a mavlink command, try “PLAY_TUNE”:

ArduPilot/mavlink/blob/master/message_definitions/v1.0/common.xml#L4831


  <field type="uint8_t" name="target_component">component ID of the target</field>
  <field type="uint8_t[32]" name="secret_key">signing key</field>
  <field type="uint64_t" name="initial_timestamp">initial timestamp</field>
</message>
<message id="257" name="BUTTON_CHANGE">
  <description>Report button state change.</description>
  <field type="uint32_t" name="time_boot_ms" units="ms">Timestamp (time since system boot).</field>
  <field type="uint32_t" name="last_change_ms" units="ms">Time of last change of button state.</field>
  <field type="uint8_t" name="state" display="bitmask">Bitmap for state of buttons.</field>
</message>
<message id="258" name="PLAY_TUNE">
  <description>Control vehicle tone generation (buzzer).</description>
  <field type="uint8_t" name="target_system">System ID</field>
  <field type="uint8_t" name="target_component">Component ID</field>
  <field type="char[30]" name="tune">tune in board specific format</field>
  <extensions/>
  <field type="char[200]" name="tune2">tune extension (appended to tune)</field>
</message>
<message id="259" name="CAMERA_INFORMATION">
  <description>Information about a camera. Can be requested with a MAV_CMD_REQUEST_MESSAGE command.</description>
  <field type="uint32_t" name="time_boot_ms" units="ms">Timestamp (time since system boot).</field>