⚠️ The sensor needs 10–60 seconds to calibrate after power-on. During this time, it may trigger falsely or stay LOW. This is normal.
Note: Lockout time (approx 2 seconds) after OUT goes LOW – sensor ignores motion to prevent oscillation.
Unlike active sensors that emit a signal (like ultrasound or radar), the HW-416-B is passive. It only listens for changes in the ambient infrared spectrum. The module integrates a pyroelectric sensor element, a specialized control chip (frequently the BISS0001 or a similar ASIC), a Fresnel lens to focus incoming light, and supportive passive components on a single printed circuit board (PCB). 2. Technical Specifications (Datasheet Summary)
int pirPin = 2; int ledPin = 13;
The Fresnel lens (the white plastic dome) must remain unobstructed. If mounting in a box, ensure the dome protrudes through a cutout.
Every object with a temperature above absolute zero emits infrared radiation. The HW-416-B contains a pyroelectric sensor split into two halves.
| Component | Function | |-----------|----------| | | Adjusts output hold time (clockwise = longer) | | Sensitivity (Rx) | Adjusts detection distance (clockwise = more sensitive / longer range) | | Trigger mode jumper (L / H) | L = single trigger, H = repeat trigger | | Temperature compensation (some modules) | Helps reduce false triggers in hot/cold environments | hw-416-b pir sensor datasheet
The HW-416-B features a straightforward 3-pin interface alongside calibration components on the back of the PCB. Pin Description Power input (Connect to 5V DC).
The HW-416-B is a passive infrared (PIR) sensor module designed to detect human presence and movement. PIR sensors are widely used in various applications, including security systems, smart home devices, and robotics. In this write-up, we will provide an overview of the HW-416-B PIR sensor, its features, specifications, and usage guidelines.
This article serves as a complete , covering every technical detail you need: electrical characteristics, pin configuration, sensitivity adjustment, time delay settings, wiring diagrams, and troubleshooting tips. ⚠️ The sensor needs 10–60 seconds to calibrate
void setup() Serial.begin(9600); pinMode(pirPin, INPUT); pinMode(ledPin, OUTPUT);
Ground connection. Connect to the common ground of your power supply and microcontroller. Onboard Adjustments and Controls
Power input pin. Connect to a DC voltage source between 4.5V and 20V. Note: Lockout time (approx 2 seconds) after OUT