Compared to older PIR models, the HW-416B is frequently favored for its . While traditional sensors rely on analog circuitry that can be finicky with temperature fluctuations, the HW-416B utilizes a dedicated IC that handles noise filtering internally. Key Specifications at a Glance
The HW416B module is a complete, ready-to-use solution. On a single PCB, you get the pyroelectric sensor, a Fresnel lens to focus infrared energy, the control circuitry, and all the adjustable components. Its key features include:
This selection is critical for applications like automated lighting: repeat mode keeps lights on while someone is moving inside a room, while non‑repeat mode is better suited for one‑shot triggering (e.g., turning on a camera only when a door opens).
// HW416B Better Interface - No delay() blocking, edge detection
A clockwise turn increases detection range up to 7 meters. Counter-clockwise reduces it, which is ideal for limiting triggers to a small room area, avoiding false triggers from hallways. hw416b pir sensor datasheet better
. It is designed to detect infrared radiation (heat) emitted by objects like human bodies and animals, making it ideal for security systems and automated lighting. Tayda Electronics Technical Specifications
If you’ve ever tried to build a motion-activated project, you’ve likely run into the . Often sold as a direct alternative or "better" version of the classic HC-SR501 , this passive infrared (PIR) sensor is a staple in the DIY electronics world.
delay(100); // Small debounce
While the HW416B is functionally similar to the more widely known HC‑SR501, there are important differences: Compared to older PIR models, the HW-416B is
Here’s what you’ll get in that better datasheet:
The is a highly efficient, low-cost passive infrared motion detector widely utilized alongside microcontrollers like Arduino and Raspberry Pi. Functioning identically to the industry-standard HC-SR501 , this module features an onboard BISS0001 processing chip , a dual-element RE200B pyroelectric sensor, and a multi-zone Fresnel lens. It is primarily deployed in smart lighting, home automation, and security alarm configurations. Core Hardware Specifications
The HW-416B excels at sensing human body heat movement through its , providing a digital signal to a microcontroller or relay. Specification Operating Voltage 4.5V to 20V DC Output Signal High (3.3V) / Low (0V) Sensing Range Up to 7 meters (Adjustable) Detection Angle < 120° cone Quiescent Current < 65uA (Low power consumption) Delay Time 0.3s to 300s (Adjustable via Potentiometer) 🔧 On-Board Controls & Customization
Once motion is detected and the output goes High, it will stay High for the set duration and then go Low, even if there is still motion. Repeatable Trigger (H): On a single PCB, you get the pyroelectric
Since the "HW-416B" is often confused with the (they share the same BISS0001 chip and lens), this post focuses on clarifying the actual specs and how to use it effectively.
Here’s the truth: But don’t worry—that doesn’t mean you can’t use it perfectly. In fact, once you understand what the HW-416B really is, you’ll be better off than if you had a 30-page spec sheet.
| Parameter | Value | | :--- | :--- | | | Passive Infrared (PIR) | | Operating Voltage | 5V - 20V (Typical 5V) | | Output Voltage | 3.3V HIGH / 0V LOW | | Current Draw | < 65 mA (Active) / ~50 μA (Standby) | | Detection Range | 3 to 7 meters (Adjustable) | | Detection Angle | ~110° cone | | Time Delay (Ton) | 3 seconds to 5 minutes (Adjustable) | | Blocking Time (Toff) | ~2.5 seconds (Fixed) | | Trigger Modes | H (Repeatable) / L (Non-repeatable) | | Warm-up Time | 30 to 60 seconds | | Operating Temp. | -15°C to +70°C | | Dimensions | ~32mm x 24mm x 24mm | | Mounting | Flange with two mounting holes |
The HW416B functions by tracking changes in ambient infrared radiation emitted by living organisms. It passes these localized thermal variations through a dual-element pyroelectric material covered by a multi-segmented dome.
Focuses infrared radiation onto the pyroelectric element, enhancing sensitivity and expanding the detection field.
| Symptom | Likely Cause | Fix from Our Improved Datasheet | |---------|--------------|----------------------------------| | Output always HIGH | Saturated sensor or lens covered | Reduce sensitivity (right pot CCW), clean lens, avoid direct sunlight or heat vents | | Output always LOW | Power ripple too high | Add 220µF + 0.1µF capacitors; ensure VCC > 3.0V | | Very short range (1-2m) | Wrong potentiometer adjustment | Turn right pot fully CW, then back 10%; check lens for scratches | | Triggers randomly every few seconds | Jumper in retrigger mode with high sensitivity | Change jumper to single mode; reduce sensitivity | | Output stays HIGH for hours | Defective delay capacitor | Replace module (C1 tantalum cap often fails) | | No response after sleep | Power removed from VCC | HW416B requires continuous power; use a MOSFET to cut power only if you allow 30s warm-up again |