Product: HW-416-B Passive Infrared (PIR) Motion Sensor
Purpose: Human/animal motion detection for low-power security, automation, and IoT applications
The HW-416-B output is 5V tolerant but outputs ~Vcc. To safely interface with 3.3V logic: hw-416-b pir sensor datasheet
Critical Note: Do not connect the output directly to a high-current load (e.g., a relay or LED strip). Use a transistor or an optocoupler for isolation. Operating Voltage: 4
💡 Quick Pro-Tip: PIR sensors require a "warm-up" period of about 30 to 60 seconds after powering on to calibrate to the environment's infrared signature. During this time, you may get false triggers. hw-416-b pir sensor datasheet
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).
⚠️ Important: The sensor needs 10–60 seconds to calibrate after power-on. During this time, it may trigger falsely or stay LOW. This is normal.