Tilt Sensor

Tilt sensors, accelerometers, gyroscopes, IMUs, and attitude sensors are often mixed together as if they all measure “angle”.

That is too rough.

Many tilt sensors are based on accelerometers, but a tilt sensor does not necessarily contain a gyroscope. A 6-axis IMU usually means a three-axis accelerometer plus a three-axis gyroscope. That is not the same thing as every tilt sensor.

The first model is: in static or low-dynamic scenes, tilt can be calculated from the gravity vector projected onto the sensor axes. In dynamic scenes, linear acceleration and vibration pollute the accelerometer, so gyroscopes, filtering, and fusion become necessary.