Triggering IP cameras or sound alarms when unauthorized entry is detected.
When motion is detected, the output goes HIGH. If the target keeps moving within the detection area before the delay time expires, the timer resets, keeping the output HIGH continuously until the target leaves. Interfacing HW-416-B with Arduino
Triggering sirens, snapshot cameras, or sending push notifications via Wi-Fi modules (ESP8266/ESP32). hw-416-b pir sensor datasheet
3 meters to 7 meters (adjustable via potentiometer)
Note that the of 2.5 seconds operates independently—after the output returns to LOW, the sensor enters a short lockout period during which it cannot be retriggered, preventing rapid oscillations. Triggering IP cameras or sound alarms when unauthorized
Many sellers list HW-416-B as equivalent to HC-SR501, but there are subtle differences:
| Parameter | Rating | |-----------|--------| | | DC 4.5V – 20V (5V typical / recommended) | | Quiescent Current | < 50 µA | | Output Signal | Digital TTL: HIGH (3.3V) when motion detected / LOW (0V) when idle | | Detection Range | 2 to 7 meters (adjustable) | | Detection Angle | < 100° to 120° cone angle | | Output Delay Time | 0.3 s to 200 s (adjustable via potentiometer) | | Blockade (Lock) Time | 2.5 seconds (default) | | Trigger Modes | Selectable: Repeatable (H) / Non-repeatable (L) | | Operating Temperature | –20°C to +70°C | | Storage Temperature | –40°C to +80°C | | Dimensions | 32.6 × 24.3 mm | Interfacing HW-416-B with Arduino Triggering sirens
Looking directly at the back of the PCB board (with the pins facing downward), the layout is typically configured as follows:
Power input (Connect to 5V DC of your microcontroller or external power source).
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