•Google’s Soli is a purpose-built chip to track your motion on a microscopic scale.
•It uses miniature radar for real-time motion tracking of the human hand; it’s able to track sub-millimetre motion at high speeds with great accuracy
•it works by emitting electromagnetic waves with objects within the beam reflecting information back to the antenna.
•Information gathered from the reflected signal – things like time delay or frequency changes – give the device information about the interaction.
•Recently launched Google Pixel 4 (mobile) uses a radar-based Soli chip to introduce Motion Sense, a feature that provides similar touchless gesture-based controls.
●Project Soli: (Google announced Project Soli in 2015)