The HW-416-B is a passive infrared (PIR) motion sensor module based on the HC-SR501 design. It detects changes in infrared radiation (body heat) within its field of view. It is widely used for human/animal motion detection in security systems, automatic lighting, and IoT projects.
into multiple zones. When a human walks, they pass between these zones, causing a fluctuating IR signal. The Pyroelectric Sensor hw-416-b pir sensor datasheet
Looking directly at the back of the PCB board (with the pins facing downward), the layout is typically configured as follows: The HW-416-B is a passive infrared (PIR) motion
| Feature | Common Assumption | Technical Reality | | :--- | :--- | :--- | | | Custom IC | BIS0001 (Generic PIR Controller) | | Distance Pot | Adjusts range (meters) | Adjusts Amp Gain (sensitivity to motion size) | | Time Pot | 0.3s to 5 mins | Determined by RC constant on Chip Pin 8; usually accurate to the label. | | Logic Mode | Always ON when moving | Requires soldering jumper to 'H' for "Always ON" behavior. | into multiple zones
While the specific model number appears to be a variance or specific batch code of the standard HC-SR501 PIR sensor (commonly found in Arduino starter kits), the "interesting report" regarding this device isn't a standard datasheet. Instead, the most compelling technical analysis focuses on the incredible complexity hidden inside a cheap sensor and the common myths about its potentiometers .
Avoid placing the sensor near heat sources, air conditioners, heaters, or direct sunlight. Moving air currents with distinct temperatures can trip the sensor.