The onboard IC (e.g., BISS0001) processes this rapid differential voltage swing. If the swing passes a predefined threshold, the IC switches the OUT pin to 3.3V. The Role of the Fresnel Lens
Many sellers list HW-416-B as equivalent to HC-SR501, but there are subtle differences:
Because the digital output is 3.3V, it can safely connect directly to the digital pins of 5V microcontrollers like the Arduino Uno, as well as 3.3V boards like the ESP32 or Raspberry Pi Pico. Wiring Guide HW-416-B Pin Arduino Uno Pin OUT Digital Pin 2 GND Arduino Example Code
The dual slots look at two distinct zones.
Reverse Engineering the HW-416-B (HC-SR501) Control Logic. Component Focus: The unlabeled COB (Chip on Board) and adjustment potentiometers.
The following sketch initializes the HW-416-B on an interrupt-capable pin (Digital Pin 2) or standard polling pin to trigger an alert when movement is detected.
HW-416-B PIR Sensor Datasheet & Guide is a popular passive infrared (PIR) motion sensor module, commonly used in security systems, smart lighting, and DIY electronics projects . It is physically and functionally identical to the
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The HW-416-B is designed for reliability and ease of use. It operates by detecting changes in infrared radiation (heat) from moving objects like humans or animals. Operating Voltage: 5V to 20V DC. Static Current: Output Level: High 3.3V / Low 0V (TTL logic). Sensing Range: Up to 7 meters (adjustable). Detection Angle: 110 raised to the composed with power cone angle. Delay Time: 0.3 seconds to 5 minutes (adjustable). Block Time: Default 2.5 seconds. Pinout and Hardware Configuration
When a warm body passes from one zone to another, the sensor detects a differential shift in IR radiation.
If the output remains permanently LOW: