But if you’re looking for the "better" datasheet, you’re usually looking for more than just pinouts—you want to know how to actually make it reliable . Here is everything you need to master the HW-416B. 1. Key Specifications at a Glance
The HW-416B PIR sensor is a capable, affordable motion detection module that works brilliantly for a wide range of projects when properly understood. The key to getting better results lies in:
Suggested post body: "Hi — I have an HW416B PIR motion sensor but can't find an official datasheet. I need: operating voltage, output type (active high/low), sensitivity/range, timing (retrigger/hold) and pinout. If anyone has a datasheet or test measurements, please share. Also welcome recommendations for better-documented replacement PIR modules compatible with 3.3–5V microcontrollers."
The datasheet gives you nothing. Here is practical, better code for both Arduino and ESP32 (with deep sleep for battery life). hw416b pir sensor datasheet better
The potentiometer labeled or Sensitivity allows you to adjust the detection range from approximately 3 meters up to 7 meters. Turning it clockwise increases the distance, while counter-clockwise decreases it. B. Time Delay Adjustment
The sensor detects motion, sets the output high, and holds it for the set delay time, regardless of whether motion continues.
| Pin | Label | Function | |-----|-------|----------| | 1 | Vcc (or +) | Power input – 5 V or 3.3 V (see power notes) | | 2 | OUT | Signal output – HIGH when motion is detected | | 3 | GND | Ground (0 V) | | 4 | (Unlabelled) | Configuration pin – used for 3.3 V bypass power | | 5 | (Unlabelled) | Second configuration pin – typically left unconnected | But if you’re looking for the "better" datasheet,
To get the most out of the HW-416B, you must understand its three-pin interface:
| Feature | HW416B | HC-SR501 | |---------|--------|----------| | Size | Smaller (32mm x 24mm) | Larger (48mm x 28mm) | | Voltage range | 3.0–5.5V | 4.5–20V | | Quiescent current | ~55µA | ~100µA (but stable) | | Retriggering jumper | Yes (poorly labeled) | Yes (clearly labeled) | | Built-in regulator | No | Yes (AMS1117 3.3V) | | Best for | Battery-powered, compact devices | Arduino projects, higher voltage |
This selection is critical for applications like automated lighting: repeat mode keeps lights on while someone is moving inside a room, while non‑repeat mode is better suited for one‑shot triggering (e.g., turning on a camera only when a door opens). Key Specifications at a Glance The HW-416B PIR
The output is active‑high and can be connected directly to the digital input pins of an Arduino, ESP32, Raspberry Pi, or similar microcontroller.
#include <esp_sleep.h>
(often identified as a high-performance version of the HC-SR501) is a widely used passive infrared (PIR) motion sensor module. It operates by detecting infrared radiation changes from moving objects like humans or pets. Tayda Electronics Key Technical Specifications HC-SR501 PIR motion sensor - Handson Technology
lastMotionState = motionState; delay(50); // Simple debounce
