Hw-416-b Pir Sensor Datasheet May 2026

The HW-416-B is a digital pyroelectric PIR motion sensor module. It uses a Fresnel lens to focus infrared radiation onto a pyroelectric detector element. Any change in IR radiation (caused by a moving warm body like a human or animal) triggers a digital output signal.

Key difference from HC-SR501: While the HC-SR501 is widely cloned, the HW-416-B is often cited as a revision or variant with a similar circuit but sometimes different component tolerances and a slightly modified lens. The "B" designation typically indicates a board revision with a white plastic case and a three-pin header pre-soldered at a 90-degree angle.

If you are looking for a standard PDF datasheet for the HW-416-B, you likely won't find one from a major manufacturer. These sensors are generic modules produced by various Chinese factories.

The most interesting finding upon inspection is the controller chip. It is usually a "blob" of black epoxy (Chip-on-Board). Through reverse-engineering efforts by the open-source community, this chip has been identified as the BIS0001 (or BISS0001) generic infrared controller.

The HW-416-B is notably smaller than the HC-SR501. Its compact form factor makes it ideal for wearable tech or small enclosure projects.

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).

The workshop at the edge of town smelled of solder and lemon oil. Under a crooked lamp, Mira wiped a smudge from a tiny board labeled HW-416-B and held it up to the light. It was one of those everyday miracles: a compact PIR sensor module—unassuming, bronze pins like teeth, a plastic dome that hid a miniature world of circuits and possibility.

She remembered the datasheet she’d printed months ago and taped to her bench: pages of pinouts, timing charts, sensitivity adjustments, and electrical specs. Engineers called those pages dry; to Mira, they were a map. The HW-416-B, the sheet said, woke at a whisper—detecting motion by sensing the warm cadence of a human body crossing its field. Typical operating voltage: Vcc 3.3–5V. Quiescent current: a courteous microamp-level slumber until something moved. Output: digital, normally low, pulsing high when heat and motion passed its sightline. The module’s sensitivity could be tuned; a trim pot on the board let you coax it to notice a cat or ignore a tree swaying in wind.

She imagined the makers: someone soldering tiny resistors, testing detection angles, verifying hold times. The datasheet’s diagrams sketched the connector: Vcc, GND, OUT. A recommended application diagram suggested powering the HW-416-B from a microcontroller’s 3.3V rail and reading the OUT pin through a pull-down resistor. There were cautions too—don’t stare into the Fresnel lens with a laser, avoid prolonged exposure to humidity, and allow thirty seconds of stabilization when powering up; the sensor needed a moment of calm to learn the background temperature before it could tell friend from phantom. hw-416-b pir sensor datasheet

Mira clipped the sensor into a prototype of a bedside lamp that would only light when someone entered the room after midnight. She soldered the Vcc and GND joints, ran a single wire from OUT to her microcontroller pin, and adjusted the sensitivity until the lamp ignored her sleeping cat but leapt to life when she walked by. Each test produced a tiny pulse on her logic analyzer: crisp, clean edges like a heartbeat. The datasheet’s timing diagram matched the pulses—an initial high for a few hundred milliseconds, then a retriggerable hold time as long as motion continued.

At midnight she tested again. The lamp obeyed: soft amber glow filling the room when she passed, conserving power the rest of the night. She smiled at the neatness of it—the way the datasheet’s sterile tables had translated into a living thing that answered a human need. The HW-416-B had become more than numbers; it was a small sentinel that watched over sleep and returned the favor with light.

Weeks later, a neighbor asked Mira for advice; he wanted a sensor for his porch that wouldn’t trigger every time a moth drifted by. She handed him the datasheet and the little board, showing him how the trim pot adjusted sensitivity, how adding a simple RC filter on the output could debounce spurious spikes, how angling the Fresnel lens slightly changed the detection zone. He left armed with both paper and practice—the datasheet as guide, the HW-416-B as tool.

On a rainy afternoon, she opened a new datasheet revision and noticed a minor update: a clarified recommended operating range and a tweak to the typical output waveform diagram. Small changes, but they mattered. She marked them in red and taped the page beside her original, a patchwork of knowledge that had guided a dozen small inventions.

The HW-416-B lived in many projects after that: a cupboard light that only came on when hands reached in, a hallway guardian that lit the way for sleepy feet, a garden alarm that stayed quiet until a fox crossed. Each time, the datasheet—a modest document of voltages, currents, and angles—was the seed from which a practical solution sprouted.

Mira liked that tech could be poetic in this way: specifications that read like constraints, which, when respected and understood, gave rise to unexpected convenience and quiet safety. The HW-416-B wasn’t a grand machine; it was a humble sensor with a simple promise and a datasheet that taught anyone patient enough how to keep that promise.

At dusk she powered up the lamp one last time, watching the sensor’s warm pulse feel across the room as she waved her hand. The LED obediently brightened, and for a moment the two of them—the maker and the module—were in a small, wordless conversation: numbers turned into function, specification into service. The datasheet lay on the bench, pages smoothed by use. It was, she thought, a little instruction manual for bringing still things to life.

The HW-416-B is a compact Passive Infrared (PIR) motion sensor module, commonly used in DIY electronics projects for detecting human movement. It is essentially a variation of the popular AM312 or HC-SR501 sensors, designed for low-power consumption and a smaller physical footprint. Core Specifications Operating Voltage: 2.7V to 12V DC. Static Power Consumption: (ideal for battery-powered devices). Output Signal: High/Low (3.3V High, 0V Low). The HW-416-B is a digital pyroelectric PIR motion

Delay Time: Fixed at approximately 2 seconds (non-adjustable). Detection Range: Up to 3–5 meters. Detection Angle: Approximately 100∘100 raised to the composed with power Operating Temperature: Pinout Configuration

The module typically features three pins, usually labeled on the underside: VCC: Power input (2.7V – 12V).

OUT: Digital output signal (Connect to an Arduino digital pin or a relay module). GND: Ground connection. Key Features & Usage Immunity to Interference: Unlike larger sensors, the

uses internal digital signal processing which makes it less susceptible to power supply noise or electromagnetic interference.

Compact Design: Its small size makes it perfect for "stealth" applications, such as automatic cabinet lighting or small security gadgets.

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

void setup() pinMode(2, INPUT); Serial.begin(9600); void loop() if (digitalRead(2) == HIGH) Serial.println("Motion Detected!"); delay(100); Use code with caution. Copied to clipboard

The HW-416-B is fantastic, but it has a "memory." The pyroelectric sensor needs time to "reset" and stabilize after it triggers. The PCB is double-layered with a ground plane

If you are walking through a sensor's field of view, stop completely, and then start moving again, the sensor might miss the second movement because it is still stabilizing from the first. In robotics or high-speed detection scenarios, this latency can be an issue. However, for standard security and lighting, it is negligible.

Many buyers confuse the HW-416-B with the HC-SR501. Here is a side-by-side comparison based on typical datasheet values:

Verdict: Choose the HW-416-B for low-power IoT sensors or motion-activated sound effects. Choose the HC-SR501 for hallway lights or alarm systems requiring a long output pulse.

If you’re building a motion-activated light, security alarm, or smart occupancy sensor, you’ve likely come across the HW-416-B PIR sensor module. At first glance, it looks identical to the famous HC-SR501. In fact, for practical purposes, the HW-416-B shares the same core components: a Pyroelectric Infrared (PIR) sensor, a BIS0001 (or similar) signal processing IC, and an adjustable lens.

In this guide, we’ll cover everything you would find in a standard datasheet, plus tips for using it with Arduino, ESP32, or Raspberry Pi.

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

Some variants include a fourth pin (low-power mode or temperature compensation), but the HW-416-B is almost always 3-pin.