module, making most tutorials and documentation for that sensor directly applicable to the Technical Specifications
When designing your next motion-sensing project, remember:
The sensor stays HIGH as long as motion is detected within the sensing area. hw-416-b pir sensor datasheet
void loop() val = digitalRead(inputPin);
The is a popular, low‑cost passive infrared (PIR) motion sensor module. It is frequently rebranded as the HC‑SR501 and is widely used in electronics projects, security systems, automatic lighting, and smart‑home automation. This article compiles all the essential information from the hw‑416‑b pir sensor datasheet and adds practical advice for beginners and experienced makers alike. module, making most tutorials and documentation for that
The white, translucent plastic dome covering the sensor is not just a protective shield; it is a . It breaks the sensor's wide field of view into multiple alternating zones of detection and non-detection. As a heat source moves across these zones, it repeatedly activates and deactivates the pyroelectric elements, creating the sharp voltage fluctuations required by the control chip to confirm true movement. 5. Interfacing HW-416-B with Arduino
The output goes high, then low, then high again if motion continues. This is useful for precise time-based triggering. 5. Wiring the HW-416-B to Arduino This article compiles all the essential information from
It was set to the center, which meant the sensor would stay active for three minutes after one tiny movement. With a small screwdriver, he turned it fully counter-clockwise, reducing the delay to a snappy three seconds. The Sensitivity Pot:
A jumper (often labeled H and L) allows for two modes:
Some variants include a fourth pin (low-power mode or temperature compensation), but the HW-416-B is almost always 3-pin.