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43 lines
1.9 KiB
Markdown
43 lines
1.9 KiB
Markdown
# Airspeed Calibration
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::: info
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[Airspeed sensors](../sensor/airspeed.md) are highly recommended for Fixed-wing and VTOL vehicles.
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:::
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:::warning
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Unlike most other sensor drivers, the airspeed sensor drivers are not automatically started.
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Before calibration they must be [enabled via the corresponding parameter](../advanced_config/parameters.md):
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- Sensirion SDP3X ([SENS_EN_SDP3X](../advanced_config/parameter_reference.md#SENS_EN_SDP3X))
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- TE MS4525 ([SENS_EN_MS4525DO](../advanced_config/parameter_reference.md#SENS_EN_MS4525DO))
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- TE MS5525 ([SENS_EN_MS5525DS](../advanced_config/parameter_reference.md#SENS_EN_MS5525DS))
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- Eagle Tree airspeed sensor ([SENS_EN_ETSASPD](../advanced_config/parameter_reference.md#SENS_EN_ETSASPD))
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:::
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## Performing the Calibration
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To calibrate the airspeed sensor:
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1. Start _QGroundControl_ and connect the vehicle.
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1. Enable the airspeed sensors if not already done (as in _warning_ above).
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1. Select **"Q" icon > Vehicle Setup > Sensors** (sidebar) to open _Sensor Setup_.
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1. Click the **Airspeed** sensor button.
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1. Shield the sensor from the wind (i.e. cup it with your hand).
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Take care not to block any of its holes.
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1. Click **OK** to start the calibration.
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1. Once asked for, blow into the tip of the pitot tube to signal the end of calibration.
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:::tip
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Blowing into the tube is also a basic check that the dynamic and static ports are installed correctly.
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If they are swapped then the sensor will read a large negative differential pressure when you blow into the tube, and the calibration will abort with an error.
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:::
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1. _QGroundControl_ then tells you if the calibration was successful or not.
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## Further Information
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- [QGroundControl User Guide > Sensors](https://docs.qgroundcontrol.com/master/en/qgc-user-guide/setup_view/sensors_px4.html#airspeed)
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