Hw-416-b | Pir Sensor Datasheet [hot]

HW-416-B PIR Sensor Datasheet & Guide is a popular passive infrared (PIR) motion sensor module, commonly used in security systems, smart lighting, and DIY electronics projects . It is physically and functionally identical to the

Introduction

• Issue: If you feed it 5v, the regulator struggles to provide a stable 3.3v if the power supply is noisy (common with cheap USB chargers). This causes false triggers.
• Interesting Fix: Many engineers report that feeding the sensor a clean 12V supply results in drastically fewer false positives compared to running it at 5V, due to the LDO operating more efficiently in its regulation band.

Repeatable Triggering:

If a person remains in the detection range, the output will stay "High" until they leave. Once the motion stops, the signal stays High for the fixed 2-second delay before dropping to Low. Quick Connection Guide (Arduino Example) To test the sensor, you can follow this simple setup: VCC →right arrow Arduino 5V GND →right arrow Arduino GND OUT →right arrow Arduino Digital Pin 2 hw-416-b pir sensor datasheet

• Cause: Warm-up period not observed or faulty lens.
• Fix: Wait 60 seconds after power-up. Clean the Fresnel lens with a dry cloth.

The PCB is double-layered with a ground plane to reduce noise. The FR-4 material ensures decent thermal stability, though prolonged exposure to direct sunlight or heat sources can trigger false positives (a common trait of all PIR sensors). HW-416-B PIR Sensor Datasheet & Guide is a

• High sensitivity and reliability
• Low power consumption
• Adjustable sensitivity and delay time
• Digital output signal
• Compact size (typically 32mm x 24mm x 10mm)

int pirPin = 2; int ledPin = 13;

const int motionPin = 2; const int ledPin = 13; int motionState = 0; Issue: If you feed it 5v, the regulator