The module consists of a , a Fresnel lens , and an analog processor . The Fresnel Lens
The PCB typically includes reserved solder pads for a photoresistor (to disable the sensor during daylight) and a thermistor (for temperature compensation). Pinout and Connection Guide PIR Motion Sensor HW416B - Tayda Electronics
Outputs a 3.3V High signal when motion is detected, and 0V Low when idle.
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. hw-416-b pir sensor datasheet
Before diving into the electrical characteristics, here are the headline features of the HW-416-B:
After motion, the sensor stays HIGH for the set delay and then goes LOW, even if there is still movement.
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. The module consists of a , a Fresnel
Cone angle of approximately 100 to 110 degrees
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.
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. The HW-416-B is a pyroelectric infrared motion sensor module
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later.
PIR modules are highly sensitive to electrical noise. If your power supply has voltage spikes or ripple (common with cheap AC-to-DC adapters), it will cause false alarms. If necessary, add a 100µF capacitor across the VCC and GND pins right at the sensor.
Unlike some sensors, the HW-416-B requires a warm-up period after power-up. During the first 10–60 seconds, the output may toggle randomly. This is normal behavior as the sensor calibrates.
