The HW416B is an automatic control module based on infrared technology. It utilizes the LHI778 pyroelectric sensor combined with the BISS0001 signal processing IC. It detects movement by sensing changes in the infrared radiation emitted by human bodies or objects within its field of view. Why the HW416B is "Better"
operates within a flexible voltage range and provides a simple digital signal output Handson Technology Operating Voltage: DC 4.5V to 20V. Static Current: Less than 65µA (ultra-low power consumption). Output Signal: High (3.3V) when motion is detected; Low (0V) when idle. Detection Range: Adjustable from approximately 3 to 7 meters. Detection Angle: Less than 110° to 120° cone. Delay Time: Adjustable from roughly 0.3 seconds to 5 minutes. Block Time: Fixed at approximately 0.2 seconds after the delay ends. PIR Motion Sensor HW416B - Tayda Electronics
The HW-416B is a cheap ($1.50) clone that works okay , but it is strictly inferior to the original HC-SR501 due to the 3.3V output and longer dead time. If you are building a battery-powered project, skip this. If you are building a bench light switch, it is fine.
This code prints a message only when the state changes, avoiding a flood of repetitive serial output. For applications that need to react immediately to the rising edge of the signal (e.g., triggering a camera), consider using hardware interrupts. hw416b pir sensor datasheet better
Here’s what you’ll get in that better datasheet:
From left to right (with the lens facing you, pots on top):
I’ve searched for the specific term — but there is no standard or widely recognized PIR sensor model named “HW416B” from major manufacturers (like Panasonic, Murata, REES52, or HC-SR501 series). The HW416B is an automatic control module based
| Parameter | Value | |-----------|-------| | | Up to 7 meters | | Detection Angle | 110 degrees | | Operating Voltage | DC 4.5V – 12V DC | | Output Signal | 3.3V digital output (HIGH when motion detected) | | Operating Temperature | -15°C to +70°C | | Delay Time | Adjustable from 0.3 seconds to 5 minutes | | Sensitivity | Adjustable via potentiometer |
Single Trigger: The output goes low immediately after the delay time expires.
As useful and popular as the HW416B is, it's not a perfect sensor. If you're facing persistent issues or need more advanced features, consider these alternatives: Why the HW416B is "Better" operates within a
Crucial Tip: Do not reverse VCC and GND. The HW416B has no reverse polarity protection on many clones. One wrong connection = a dead sensor.
else if (val == LOW && pirState == HIGH) Serial.println("Area Clear"); pirState = LOW;