Turning on LED strips or lamps when someone enters a room and turning them off after they leave.
Even with a datasheet, users face issues. Here are solutions specific to the HW-416-B:
from a wide area onto the small pyroelectric element.
The HW-416-B output is . To safely interface with 3.3V logic: hw-416-b pir sensor datasheet
Detection Range: 3 to 7 meters (Adjustable). Detection Angle: Approximately 110° to 120° cone. Operating Temperature: -15°C to +70°C. 🛠️ Tuning the Hardware
Looking directly at the back of the PCB board (with the pins facing downward), the layout is typically configured as follows:
int ledPin = D7; // Onboard LED int inputPin = D2; // Sensor input Turning on LED strips or lamps when someone
A known solution is interference from the microcontroller itself. If the sensor is placed too close to your Raspberry Pi, it may cause false triggering. Moving the sensor farther away (about 5 feet) can resolve this problem.
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.
Digital signal output (3.3V Logic). Connects directly to any microcontroller digital input pin. GND: Ground connection (0V). Onboard Adjustments The HW-416-B output is
The is a highly efficient, low-cost electronic module designed to detect human or animal movement. It is widely used in smart home automation, security systems, and energy-saving lighting projects. By capturing changes in infrared radiation emitted by living bodies, this compact sensor provides an easy-to-use digital output for microcontrollers.
These specifications show the HW-416-B is suitable for many indoor motion-sensing applications. Its wide voltage range and low power consumption make it ideal for battery-powered, IoT, and energy-harvesting projects.
Ultimate Guide to the HW-416-B PIR Motion Sensor: Datasheet, Pinout, and Arduino Integration
| Parameter | Value / Range | | :--- | :--- | | | Passive infrared (PIR) | | Operating voltage | 3.5 V – 5.5 V DC (with 5 V typical) | | Output signal | Digital (HIGH / LOW) | | Detection range | Adjustable from ~3 m to ~7 m | | Detection angle | ~110° – 120° cone | | Output high voltage | ~3.3 V (suitable for 3.3 V or 5 V logic) | | Output low voltage | 0 V | | Adjustable delay time (Ton) | ~3 s to ~5 minutes | | Blocking time (Toff) | ~2.5 s (fixed) | | Warm‑up time | ~30 – 60 seconds after power‑on | | Current consumption | < 65 mA (typically much lower) | | Operating temperature | -20 °C to +70 °C | | Dimensions | ~32.6 mm × 24.3 mm |