Hw-416-b Pir Sensor Datasheet [exclusive]

The HW-416-B: The "Always Watching" Sentinel for Your Projects

In the world of DIY electronics, few components offer as much "bang for your buck" as the Passive Infrared (PIR) sensor. The HW-416-B is a popular iteration of the classic HC-SR501 design, repackaged into a smaller, more breadboard-friendly form factor.

Some variants include a fourth pin (low-power mode or temperature compensation), but the HW-416-B is almost always 3-pin. hw-416-b pir sensor datasheet

Timing Diagram (Crucial for Firmware Design)

Based on behavior observed from multiple HW-416-B units: The HW-416-B: The "Always Watching" Sentinel for Your

• L (Non-Retriggerable): The sensor triggers, runs the timer, and ignores any new movement during that time. It must reset before it can trigger again. This is terrible for security lights (the light turns off even if you are dancing in front of it).
• H (Retriggerable): The sensor triggers. If it detects movement while the timer is running, the timer resets. This is the default behavior most people expect, but the module often ships in 'L' mode by default, causing user frustration.

Output goes low once the delay expires, regardless of continued motion. H (Repeatable): Output stays high as long as continuous motion is detected. Basic Arduino Connection L (Non-Retriggerable): The sensor triggers, runs the timer,

Verdict: Choose the HW-416-B for low-power IoT sensors or motion-activated sound effects. Choose the HC-SR501 for hallway lights or alarm systems requiring a long output pulse.