What Is a Gyroscope?
1 min read
Quick answer
A gyroscope is a MEMS sensor that measures an object's angular rate (how fast it rotates). It's indispensable for detecting rotational motion.
How Does It Work?
Inside it there's a tiny vibrating mass; when the object rotates, the Coriolis force pushes this mass sideways, and this deflection is converted to angular rate.
Difference From an Accelerometer
| Sensor | Measures |
|---|---|
| Accelerometer | Linear acceleration / tilt |
| Gyroscope | Angular rate (rotation) |
Where Is It Used?
Drone and flight-control boards, camera/gimbal stabilization, game controllers, robotics and heading tracking inside an IMU.
Measurement Range (dps)
The maximum rotation rate a gyroscope measures is given in degrees/second (dps): ±250 dps suits precise, ±2000 dps fast rotation. If the system rotates faster than expected and the range is small, the measurement saturates and gives a wrong result.
Common Mistakes
- Ignoring drift: gyroscope data drifts over time; it isn't enough for angle on its own.
- Not combining with an accelerometer: the two are used together (sensor fusion) for a stable angle.
- Skipping calibration: the zero-point offset must be corrected.
Frequently Asked Questions
Why does a gyroscope drift?+
Because rate is integrated over time to find the angle, small errors accumulate; so it's corrected with an accelerometer.
Is a gyroscope enough on its own?+
Usually no; for a stable heading it's used with an accelerometer (and magnetometer) as an IMU.
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