HC-SR501 Infrared PIR Motion Sensor Module for Arduino Raspberry Pi, Adjustable Delay Time
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HC-SR501 Infrared PIR Motion Sensor Module | Adjustable Delay (5-18s) Wide-Range 4.5-20V Supply Passive Infrared Motion Detection Module with Low Quiescent Current for Arduino, Raspberry Pi and Embedded Security / Automation Projects
The HC-SR501 is the standard PIR (Passive Infrared) motion sensor module for Arduino and Raspberry Pi embedded designs. Detects motion via infrared radiation changes — ideal for security products, human body sensor toys, industrial automation, smart home security, and any application needing passive motion detection without active illumination.
Wide operating voltage range of DC 4.5-20V works directly from 5V Arduino rails, 12V industrial supplies, or battery packs without level shifters. Adjustable delay time from 5 to 18 seconds via onboard potentiometer — lets you tune the output pulse width to your application logic. Quiescent current less than 50 µA enables long battery life in always-on standby. Cone angle <100° provides wide detection coverage from a single sensor. Compact 32 × 24 mm board size fits inside small enclosures.
Trigger Modes
The HC-SR501 supports two trigger modes selectable via on-board jumper:
- L mode (non-repeated trigger) — output goes high for the delay period, then low, regardless of continued motion.
- H mode (repeated trigger, default) — output stays high as long as motion is detected, plus the delay period after motion stops.
Typical Applications
- Security alarm products — intrusion detection in indoor / outdoor security systems.
- Smart home automation — motion-activated lighting, occupancy sensors for HVAC.
- Human body sensor toys — interactive electronics, robotics that respond to people.
- Industrial automation — motion-based machine control, presence sensing in workflows.
- Embedded MCU integration — Arduino / STM32 / ESP32 / RPi-based motion-triggered logic.
- Educational electronics — teaching PIR sensing, GPIO interrupt handling.
HC-SR501 Specifications
| Feature | Specification |
|---|---|
| Sensor Type | Passive Infrared (PIR) |
| Operating Voltage Range | DC 4.5 – 20V |
| Quiescent Current | < 50 µA |
| Trigger Modes | L (non-repeated) / H (repeated, default) |
| Delay Time (Adjustable) | 5 – 18 seconds (onboard potentiometer) |
| Board Size | 32 × 24 mm (compact) |
| Cone Angle | < 100° |
| Output Type | Digital (high/low) |
| Compatibility | Arduino / Raspberry Pi / STM32 / ESP32 / generic MCU |
| Condition | Brand New |
FAQ — HC-SR501 PIR Motion Sensor
Q: How sensitive is it? Will it trigger from a pet / fan / sunlight?
A: PIR sensors detect changes in infrared radiation — moving warm bodies trigger them. Pets typically trigger PIR sensors as much as humans. Direct sunlight, hot HVAC vents, or rapidly-changing temperature can cause false triggers. Use the onboard sensitivity adjustment + L-mode trigger + software debouncing for cleaner motion detection.
Q: What's the detection range?
A: Typical detection range is 3-7 meters in front of the sensor, with cone angle <100°. Range depends on temperature difference between target (warm body) and background, and ambient temperature. Cooler background = better range.
Q: How do I adjust the delay and sensitivity?
A: Two onboard potentiometers control delay (5-18s) and sensitivity. Rotate clockwise to increase. The jumper next to the potentiometers selects L vs H trigger mode. Default H mode + medium delay is the common starting point — tune from there for your application.
Q: Bulk pricing for production runs?
A: Yes — email contact@lys-sz.com with your quantity for tier pricing on HC-SR501 stock for educational kits or production deployments.
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Educational kit makers or system integrators stocking HC-SR501 by the reel? Email contact@lys-sz.com for bulk pricing. Worldwide shipping from our Shenzhen warehouses.
Buying in bulk for a mining farm or repair shop?
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