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13 lines
682 B
Markdown
13 lines
682 B
Markdown
# Accelerometer Hardware & Setup
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PX4 uses accelerometer data for velocity estimation.
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You should not need to attach an accelometer as a stand-alone external device:
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- Most flight controllers, such as those in the [Pixhawk Series](../flight_controller/pixhawk_series.md), include an accelerometer as part of the flight controller's [Inertial Motion Unit (IMU)](https://en.wikipedia.org/wiki/Inertial_measurement_unit).
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- Gyroscopes are present as part of an [external INS, AHRS or INS-enhanced GNSS system](../sensor/inertial_navigation_systems.md).
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The accelerometer must be calibrated before first use of the vehicle:
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- [Accelerometer Calibration](../config/accelerometer.md)
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