This is a simple to use PIR motion sensor with Grove compatible interface. Simply connect it to Stem shield and program it, when anyone moves in it's detecting range, the sensor outputs HIGH on its SIG pin.
The detecting range and respons speed can be adjusted by 2 potentiometers soldered on its circuit board, The response speed is from 0.3s - 25s, and max 6 meters of detecting range.
Specifications
Grove compatible interface
Voltage range: 3V