The Pir is used to measure the Infrared (IR) Light that radiates from objects in its field of view. Pir Sensors are usually called simply "Pir", or sometimes "Pid", for "Passive Infrared Detector". The term passive refers to the fact that Pir devices do not radiate energy for the purpose of detection. They work entirely by detecting infrared radiation emitted or reflected by objects.
This unit communicates with the M5Core through Grove B.
Warning: This Unit has a 2 Second Delay.