Users have reported some common issues, particularly with false triggers or the sensor not behaving properly.
Power input. Connect to a 5V source on your microcontroller.
Turning off desk monitors, lights, or exhaust fans when a room becomes vacant.
The HW-416-B is notably smaller than the HC-SR501. Its compact form factor makes it ideal for wearable tech or small enclosure projects. hw-416-b pir sensor datasheet
Clockwise rotation increases the duration the output pin stays "HIGH" after detecting motion. Counter-clockwise rotation decreases the time down to roughly 5 seconds. How the HW-416-B Works
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
: The sensor outputs HIGH continuously with no motion present. Users have reported some common issues, particularly with
import RPi.GPIO as GPIO import time
if (val == HIGH) // Motion detected digitalWrite(ledPin, HIGH); if (pirState == LOW) Serial.println("Motion detected!"); pirState = HIGH;
The HW-416-B uses a simple three-pin interface for basic operation: Turning off desk monitors, lights, or exhaust fans
The HW-416-B uses a simple three-pin interface (VCC, OUT, GND), but also features a four-pin configuration header that allows advanced options.
The is a popular, low‑cost passive infrared (PIR) motion sensor module. It is frequently rebranded as the HC‑SR501 and is widely used in electronics projects, security systems, automatic lighting, and smart‑home automation. This article compiles all the essential information from the hw‑416‑b pir sensor datasheet and adds practical advice for beginners and experienced makers alike.
Power supply input (4.5V – 20V DC). Connect to the 5V output of your microcontroller.
What is the you are building (e.g., security system, automated light)?
Digital output. It sends a High (3.3V) signal when motion is detected and remains Low (0V) when idle. GND: Ground connection.