Seeed Studio Grove mini PIR motion sensor

Compact motion sensor for low-range detection

The Seeed Studio Grove mini PIR motion sensor is a passive infrared detector built for projects that need basic presence sensing within a short radius. Its 20mm by 20mm footprint and 12mm height allow it to sit inside tight enclosures where larger modules cannot fit. The sensor targets hobbyists and prototypers who want a ready-to-use motion trigger without designing analogue front-end circuitry.

Grove connector simplifies wiring to Arduino

A standard Grove socket carries power and signal, so the board plugs directly into a Grove shield or hat without jumper wires or breadboards. The interface works with both Arduino and Raspberry Pi platforms, freeing GPIO pins for other tasks while the sensor handles detection. A reserved pad on the rear accepts a slide rheostat, letting builders tune the trigger threshold by soldering a single component.

Steady output while a warm body remains in view

The detector holds its signal high for as long as infrared radiation from a moving person stays within the sensing zone, rather than pulsing briefly on each movement. Optimal reliability occurs at 25°C and at distances up to 2m, with a published maximum reach of 3m to 5m. Mounting orientation affects sensitivity, so the module should be positioned horizontally for consistent coverage.