PIR Infrared Human Motion Detector Relay Output Light Control Occupancy Sensor

Choose from PIR infrared, 24GHz microwave, or dual infrared plus microwave detection, all within the same series at $17 to $19, covering low-cost and high-accuracy scenarios.

The infrared plus microwave model requires simultaneous detection from both sensors before alarming, dramatically reducing false triggers caused by pets, heat sources, or air movement.

The microwave variant detects motion through glass and thin wooden partitions, enabling coverage in areas where direct line-of-sight installation is not possible or practical.

Unlike PIR sensors, the 24GHz radar model maintains consistent sensitivity regardless of ambient temperature changes, smoke presence, airflow, or dust buildup in the detection zone.

Ceiling-mounted design delivers full omnidirectional 360 degree detection with a 6m diameter coverage area at 3.6m installation height, eliminating blind spots common in wall-mounted alternatives.

Onboard automatic temperature compensation adjusts detection thresholds in real time, maintaining stable sensitivity as ambient temperature fluctuates throughout the day.

Built-in radio frequency interference suppression covers the 20 to 1000MHz range, blocking false alarms from nearby mobile communication signals, Wi-Fi routers, and other RF sources.

PIR model supports 5s, 10s, or 30s alarm output durations, while the microwave model allows register-level adjustment from 0 to 65535 seconds for custom automation and security workflows.

Alarm delay is software-settable: the device waits until the delay period ends before alarming, and resets if triggering stops within the delay, reducing nuisance alerts in high-traffic areas.

Standard ModBus-RTU protocol over RS485 enables integration into PLCs, BMS systems, and custom software platforms without proprietary gateways or additional protocol converters.