If you experience erratic behaviour when using 5 V, try the 3.3 V configuration. Some users have reported that the sensor works more reliably when the supply voltage matches the logic level of the microcontroller.
The output pulse characteristics have been measured by users: approximately , 1.156-second pulse width , and a shortest period between a falling edge and the next rising edge of about 2.146 seconds . This gives you a solid foundation for designing your timing logic.
The HW416B produces a :
Have a specific HW416B issue not covered here? Leave a comment or check the community forum links below. And if you found a better calibration trick, share it – that is how we all improve beyond the datasheet. hw416b pir sensor datasheet better
Regardless of the silkscreen on the PCB, this is a classic, low-cost Passive Infrared (PIR) motion sensor module. It's designed to detect the movement of a human (or animal) by sensing changes in ambient infrared radiation.
But if you’re looking for the "better" datasheet, you’re usually looking for more than just pinouts—you want to know how to actually make it reliable . Here is everything you need to master the HW-416B. 1. Key Specifications at a Glance
The primary electrical constraints defined in the device datasheet include: How to Wire a PIR Sensor: A Simple DIY Guide If you experience erratic behaviour when using 5
If you are using this with a 3.3V microcontroller, ensure the sensor is powered by 5V for better stability, but the 3.3V signal out is safe for your microcontroller inputs. 6. Applications for the HW416B Smart Lighting: Automating hallway or closet lights. Security Systems: Triggering alarms or cameras.
void setup() Serial.begin(9600); pinMode(pirPin, INPUT); pinMode(ledPin, OUTPUT); Serial.println("HW416B PIR Sensor Ready (Better version)"); delay(1000); // Sensor stabilization time
Disclaimer: Always verify pinouts with a multimeter. Counterfeit boards may vary. This gives you a solid foundation for designing
: Ground reference. Must be shared with your microcontroller's ground. Onboard Adjustments
Allows for precise calibration of detection distance and output duration. 2. Detailed Technical Specifications (Datasheet Insights)
const int pirPin = 2; // HW416B OUT pin const int ledPin = 13; // Built-in LED int motionState = LOW; int lastMotionState = LOW;
There are two small, blue, square potentiometers on the board. They are your primary tools for tailoring the sensor's behavior.
Integrating the HW-416B with an Arduino Uno, Nano, or ESP32 is straightforward since it outputs a clean digital signal. Wiring Diagram Connect HW-416B to Arduino 5V Connect HW-416B GND to Arduino GND Connect HW-416B OUT to Arduino Digital Pin 2 Optimized Arduino Sketch