Hw-416-b Pir Sensor Datasheet [patched] -

| Pin | Name | Description | |-----|------|-------------| | 1 | VCC | Power input (4.5V – 20V DC) | | 2 | OUT | Digital output (HIGH = motion detected, LOW = idle) | | 3 | GND | Ground (0V) |

| Pin | Name | Description | |-----|--------|------------------------------------| | 1 | VCC | 4.5V – 20V DC power input | | 2 | GND | Ground | | 3 | OUT | Digital output (HIGH = motion) |

// Define Pin Allocations const int PIR_PIN = 2; // HW-416-B OUT pin connected to Digital Pin 2 const int LED_PIN = 13; // Onboard LED indicator int pirState = LOW; // We start assuming no motion detected int val = 0; // Variable for reading the pin status void setup() pinMode(PIR_PIN, INPUT); // Declare PIR sensor as input pinMode(LED_PIN, OUTPUT); // Declare LED as output Serial.begin(9600); Serial.println("Initializing HW-416-B PIR Sensor..."); delay(10000); // Warm-up delay for the sensor to stabilize Serial.println("Sensor Ready!"); void loop() val = digitalRead(PIR_PIN); // Read input value if (val == HIGH) // Check if the input is HIGH digitalWrite(LED_PIN, HIGH); // Turn LED ON if (pirState == LOW) // Motion just started Serial.println("Motion detected!"); pirState = HIGH; else digitalWrite(LED_PIN, LOW); // Turn LED OFF if (pirState == HIGH) // Motion just ended Serial.println("Motion ended."); pirState = LOW; Use code with caution. Troubleshooting and Best Practices

print("PIR Module Test (CTRL+C to exit)") time.sleep(2) print("Ready")

Whether you are building a simple hallway light, a comprehensive security system, or an IoT‑connected occupancy monitor, the HW‑416‑B (or its HC‑SR501 equivalent) is an ideal choice. Follow the wiring diagrams and code examples in this guide, let the sensor warm up properly, and you will have a reliable motion detector running in minutes. hw-416-b pir sensor datasheet

Always verify the specific variant’s features (e.g., presence of photoresistor/thermistor headers, voltage regulator type) before purchasing for specialized applications.

A frequent complaint with the HW‑416‑B is that it triggers constantly after being mounted in a certain location. This is usually caused by:

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)

The actual infrared detection is done by a pyroelectric sensor that responds to changes in infrared radiation. Because humans emit infrared at a wavelength of about 10 µm, the sensor is naturally sensitive to human movement. The white dome on top of the module is a . It divides the detection area into multiple zones and focuses the infrared energy onto the sensor, greatly increasing the detection range and angle. Without the Fresnel lens, the sensor would only “see” a narrow, short‑range window. | Pin | Name | Description | |-----|------|-------------|

The 3.3V HIGH signal is standard for PIR chips (like the BISS0001 frequently utilized on these modules). This is perfectly adequate to trigger a 5V Arduino digital pin, which registers any voltage above 3.0V as a logic HIGH.

. It was a "passive" observer, waiting silently to catch the infrared signature of a human body. He carefully wired the three pins: to ground, and the pin to his Arduino’s digital pin 2.

The following sketch reads the PIR sensor once per second and prints the result to the Serial Monitor:

In the world of DIY electronics, few components offer as much "bang for your buck" as the Passive Infrared (PIR) sensor. The is a popular iteration of the classic HC-SR501 design, repackaged into a smaller, more breadboard-friendly form factor. Always verify the specific variant’s features (e

If motion is detected while the output is already high, the "delay timer" restarts. The output stays high as long as there is continuous movement. 5. Typical Applications

Typically 5V to 20V DC (includes an onboard 3.3V regulator).

The HW‑416‑B has three main pins, plus two extra pins that allow 3.3 V operation.