volatile bool motionDetected = false; unsigned long lastMotionTime = 0; const unsigned long MOTION_HOLD_MS = 3000; // Match sensor's delay
else if (val == LOW && pirState == HIGH) Serial.println("Area Clear"); pirState = LOW;
Here’s the truth: But don’t worry—that doesn’t mean you can’t use it perfectly. In fact, once you understand what the HW-416B really is, you’ll be better off than if you had a 30-page spec sheet.
Most HW416B modules have five pins arranged in two rows. Here’s the standard pinout based on actual board labels and verified user experiences: hw416b pir sensor datasheet better
This determines how long the "High" signal lasts after the last detected movement. Integration Tips for Better Stability
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: Avoid placing the sensor near air conditioners, heaters, vents, or direct sunlight. Moving air masses of varying temperatures trigger the sensor. Here’s the standard pinout based on actual board
Extremely low static current ( ), ideal for battery-powered IoT applications. Expert & User Review Highlights Reliability: Experts from AliExpress Wiki note that the
void loop() if (motionDetected) digitalWrite(LED_PIN, HIGH); Serial.println("Motion detected!"); motionDetected = false; lastMotionTime = millis();
In this mode, the output remains HIGH as long as motion is continuously detected. Each time motion is detected, the delay timer resets. The output will only go LOW after the delay period has elapsed without any motion detection. Each time motion is detected
const int PIR_PIN = 2; const int LED_PIN = 13;
The HW-416B and HC-SR501 are often considered interchangeable, but they're not identical.
The HW-416B has (trimpots).
Default 2.5 seconds (prevents immediate re-triggering) Operating Temperature: -15°C to +70°C HW416B Pinout and Interface