Micro-Electro-Mechanical System (MEMS) gyroscopes are motion sensors that detect and measure the angular motion of an object. They measure the rate of rotation of an object around a particular axis: 1-axis, 2-axis, and 3-axis.

How does a gyroscope keep spinning?

As the two points rotate, they continue their motion.

This effect is the cause of precession. The different sections of the gyroscope receive forces at one point but then rotate to new positions! ... These forces rotate the wheel in the precession direction.

How does phone gyroscope work?

Modern smartphones use a kind of gyroscope that consists of a tiny vibrating plate on a chip. When the phone's orientation changes, that vibrating plate gets pushed around by the Coriolis forces that affect objects in motion when they rotate.