Hw-416-b Pir Sensor Datasheet < 2024-2026 >

Digital output pin. Outputs 3.3V TTL High when motion is detected; outputs 0V Low when idle. GND: Ground connection. Connect to the system ground. Onboard Adjustments (Potentiometers and Jumpers)

When power is first applied to the HW-416-B, it requires anywhere from 30 to 60 seconds to learn the ambient infrared signature of the room. Any readings during this initialization window should be ignored. hw-416-b pir sensor datasheet

The HW-416-B is built around the —a highly capable infrared sensing signal processor IC designed specifically for pyroelectric infrared applications. Digital output pin

A frequent complaint with the HW‑416‑B is that it triggers constantly after being mounted in a certain location. This is usually caused by: Connect to the system ground

| Problem | Likely Fix | |--------------------------|-------------| | Always HIGH output | Adjust sensitivity down; check for heat source (sun, heater) facing sensor | | Never triggers | Increase sensitivity; wait 15-30 sec after power-up for stabilization | | Triggers randomly | Disable “H” repeatable trigger; add a small capacitor (100nF) across VCC/GND | | Short detection range | Clean Fresnel lens; rotate sensitivity pot clockwise | | Output stays HIGH too long | Reduce time delay potentiometer (counter-clockwise) |