The sensor is split into two halves. When there is no movement, both halves detect the same amount of ambient IR radiation. When a warm body (like a human) passes by, it intercepts one half of the sensor first, causing a positive differential change between the two halves. As the body leaves the detection area, the reverse happens. This differential change triggers the onboard processing IC (commonly the BISS0001), which then drives the pin to a HIGH (3.3V) state. Step-by-Step Arduino Integration
sat atop a stack of breadboards, its white, faceted dome—the Fresnel lens—looking like a miniature igloo under the desk lamp. Leo was an inventor by night, and tonight, his mission was simple: build a security system for his snack drawer.
The HW-416-B is a pyroelectric infrared motion sensor module. It detects infrared radiation (heat) emitted by humans, animals, or objects moving within its field of view.
He squinted at the datasheet, noting the module’s core—the hw-416-b pir sensor datasheet
, offering tight component tolerances for stable performance in varying temperatures. Specification DC 4.5V – 20V Static Current Output Level 3.3V (High) / 0V (Low) Detection Range Adjustable from 3m to 7m Detection Angle < 120° cone angle Delay Time Adjustable (approx. 0.3s to 5 minutes) Operating Temp -20°C to +80°C Pinout & Wiring HC-SR501 PIR MOTION DETECTOR
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 (or BISS0001) generic infrared controller.
| Parameter | Min | Typical | Max | Unit | | :--- | :--- | :--- | :--- | :--- | | Supply Voltage (VCC) | 4.5 | 5.0 | 20 | V | | Output Current (sink/source) | – | 10 | 100 | mA | | Output Logic High | 2.4 | 3.3 | 3.5 | V | | Output Logic Low | 0 | 0.4 | – | V | | Standby Current | 20 | 45 | 60 | µA | | Warm-up Time (initial power-on) | – | 30 | 60 | sec | The sensor is split into two halves
2.5 seconds (default time the sensor ignores movement after an output cycle)
This comprehensive guide serves as an expanded technical datasheet and practical integration manual for the HW-416-B module. You will learn its technical specifications, pinout configurations, internal mechanics, and how to interface it with microcontrollers like Arduino. 1. Product Overview
| Problem | Likely Cause | Solution | |---------|--------------|----------| | No output | Warm-up period | Wait 60 seconds after power-on | | Always HIGH | SENS too high | Reduce SENS pot counter-clockwise | | Always LOW | Delay too short or SENS too low | Increase TIME or SENS pot | | False triggers | Vibration, RF noise, or heat sources | Mount securely; add 100nF cap across VCC/GND | | Short detection range | Lens dirty or SENS low | Clean lens; increase SENS | As the body leaves the detection area, the reverse happens
Passive Infrared (PIR) sensors are the backbone of modern security systems, automated lighting, and smart home robotics. Among the various budget-friendly modules available to makers and engineers, the stands out for its compact form factor, reliability, and ease of integration.
Pairing the HW-416-B with a buzzer or GSM module to alert homeowners of entry.
Inadequate filtering or voltage fluctuations on the VCC line can cause false triggers. Add a 100µF decoupling capacitor across VCC and GND close to the sensor.
Activating a buzzer or sending a notification when movement is detected in a restricted area.
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.