This chip uses bouncing infrared rays so effectively, it can tell what your hand is doing.
IR Gesture click carries a chip that is based on the same technology used in conventional proximity and ambient light sensors: an infrared transmitter paired with a receiver that catches rays bouncing off an object. But there’s a twist.
The receiving end of the infrared loop is consisted of four photodiodes instead of one. Because of that, the APDS-9960 aboard IR gesture click has more data to work with. Enough for an integrated gesture engine to infer the position, speed and direction of objects moving above it (in most cases, a hand).
It can do basic gestures like one-directional swipes: up, down, left or right; but you can also configure it to recognize more complex manoeuvres.
At the same time, however, it can still perform as an ambient light or proximity sensor – so you can configure it to automatically wake up only when you get your hand close by.