void loop() motionState = digitalRead(motionPin); if (motionState == HIGH) digitalWrite(ledPin, HIGH); Serial.println("Motion detected!"); else digitalWrite(ledPin, LOW);
| Feature | HW-416-B | HC-SR501 | | :--- | :--- | :--- | | Size | Smaller (32x24mm) | Larger (32x24mm approx, thicker) | | Quiescent Current | < 50 µA | < 65 µA | | Adjustable Time Delay | Usually fixed or very short (2.5s) | Yes (0.3s – 600s) | | Retriggering Mode | Internal (automatic) | Jumper-selectable (single/retrigger) | | Best for | Battery-powered, short-lived triggers | Security lights, long delays | hw-416-b pir sensor datasheet
delay(100);
Introduction The HW-416-B is one of the most popular and cost-effective Passive Infrared (PIR) motion sensor modules available in the electronics market. Often found in Arduino starter kits, security lighting projects, and automatic door systems, this module is frequently compared to its predecessor, the HC-SR501. However, the HW-416-B offers distinct advantages in terms of size, power consumption, and adjustability. | Pin Name | Function | Description |
| Pin Name | Function | Description | | :--- | :--- | :--- | | | Power Input | Connect to +5V DC (or 4.5V–20V). Do not exceed 20V. | | GND | Ground | Common ground with the microcontroller or load circuit. | | OUT | Digital Output | Goes HIGH (3.3V) when motion is detected. Falls LOW after lock-down time. | | | OUT | Digital Output | Goes HIGH (3
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