The following table compiles the key electrical and mechanical parameters found in the hw‑416‑b pir sensor datasheet:
The is one of the most popular and cost-effective Passive Infrared (PIR) motion sensor modules available on the market. Often recognized by its white circular housing and three-pin male header, this board is a staple in Arduino, Raspberry Pi, and ESP32 projects. Despite its widespread use, finding a consolidated, accurate datasheet for the HW-416-B can be challenging, as it is frequently confused with the HC-SR501.
Every object with a temperature above absolute zero emits infrared radiation. The HW-416-B contains a pyroelectric sensor split into two halves. hw-416-b pir sensor datasheet
The module typically features three pins, usually marked on the PCB or under the white Fresnel lens: Power input ( is recommended for most applications). OUT: Digital output signal ( 3.3V3.3 cap V GND: Ground connection. On-Board Adjustments
This knob adjusts the detection distance. Turning it clockwise increases the sensitivity (up to ~7 meters), while counter-clockwise decreases it. 4.2 Time Delay Adjustment (Potentiometer) The following table compiles the key electrical and
Decreases the output high duration (down to ~5 seconds). 3. Jumper Trigger Selection
What should react when motion is detected (e.g., a relay, a buzzer, an MQTT broker packet)? Are you designing a battery-powered system? Share public link Every object with a temperature above absolute zero
delay(1000);
Turn the sensor over to inspect the back of the PCB. You will find two small potentiometers (trim pots) that allow you to calibrate the module's behavior manually without altering your source code:
In this post, we’ll break down the technical specifications, pinout, and key features to help you integrate it into your next build. Core Specifications