HC-SR501 PIR Motion Sensor Module
₹64.90 incl. GST (₹55.00 + GST)
The HC-SR501 PIR Motion Sensor Module detects human and animal movement using infrared sensing, with an adjustable 3–7m detection range and 5–200s delay. Operating at 4.5V–20V, it provides a digital HIGH/LOW output and low power consumption. Ideal for security systems, automatic lighting, robotics, Arduino, ESP32, and Raspberry Pi projects.
HC-SR501 PIR Motion Sensor Module
Product Description
The HC-SR501 PIR Motion Sensor Module is a reliable and adjustable Passive Infrared (PIR) motion sensor designed to detect movement of humans and animals by sensing changes in infrared radiation. It is widely used in home security, automatic lighting, robotics, industrial automation, Arduino, Raspberry Pi, and ESP32 projects.
The module features a high-sensitivity dual-element PIR sensor with a Fresnel lens that provides a wide detection area. Its adjustable controls allow users to configure both the detection distance and the output delay according to project requirements.
Adjustable Sensitivity and Delay
The HC-SR501 includes two onboard potentiometers for convenient adjustment.
Sensitivity Adjustment
The sensitivity control allows the detection range to be adjusted from approximately 3 meters to 7 meters.
- Clockwise: Increases detection distance
- Counterclockwise: Decreases detection distance
Time Delay Adjustment
The time-delay control determines how long the output remains HIGH after motion is detected.
- Clockwise: Increases delay
- Counterclockwise: Decreases delay
- Adjustable from approximately 5 seconds to 200 seconds
High-Sensitivity PIR Detection
The module uses a dual-element infrared sensor combined with a Fresnel lens to detect changes in infrared energy caused by moving objects. When motion is detected, the module produces a HIGH 3.3V TTL output.
When no motion is detected, the output returns to LOW 0V.
Low Power Operation
With a static current consumption of less than 60µA, the HC-SR501 is suitable for applications where low power consumption is important, including battery-operated security systems and automatic lighting projects.
Key Features
- Passive infrared motion detection
- High-sensitivity dual-element PIR sensor
- Fresnel lens for wide-area detection
- Adjustable detection distance
- Adjustable output delay
- 3m–7m detection range
- <140° detection angle
- Low static current consumption
- 4.5V–20V DC operating voltage
- Digital HIGH/LOW TTL output
- Suitable for Arduino, Raspberry Pi, and ESP32
- Compact and easy-to-mount design
Technical Specifications
| Feature | Specification |
|---|---|
| Model | HC-SR501 |
| Operating Voltage | 4.5V – 20V DC |
| Static Current | <60µA |
| Output Level | HIGH 3.3V / LOW 0V TTL |
| Detection Range | 3m – 7m Adjustable |
| Detection Angle | <140° Cone Angle |
| Delay Time | 5s – 200s Adjustable |
| Blockade Time | 2.5s Default |
| Dimensions | 32mm × 24mm × 18mm |
| Operating Temperature | -20°C to +80°C |
Working Principle
The HC-SR501 detects changes in infrared radiation emitted by objects within its sensing area. When a person or animal moves through the detection zone, the change in infrared energy is detected by the PIR element.
The onboard processing circuit then generates a digital output signal. The output becomes HIGH (3.3V) when motion is detected and LOW (0V) when the sensor is idle.
Output Interface
The module provides a digital TTL-compatible output that can be connected to a microcontroller or control circuit.
- HIGH (3.3V): Motion detected
- LOW (0V): No motion detected
This makes the module easy to integrate with Arduino, Raspberry Pi, ESP32, relay modules, alarms, and automation controllers.
Typical Application Scenarios
Home Security
Suitable for burglar alarms, intrusion detection systems, and motion-triggered security devices.
Automatic Lighting
Can be used to automatically control hallway, bathroom, stairway, and room lighting when movement is detected.
Robotics
Useful for robots that need to detect nearby human movement and respond accordingly.
Industrial Automation
Can be integrated into access control systems, automatic doors, and other motion-triggered equipment.
Applications
- Home security systems
- Burglar alarms
- Intrusion detection
- Automatic lighting
- Smart home automation
- Motion-activated switches
- Robotics
- Automatic doors
- Access control systems
- Industrial automation
- Arduino projects
- Raspberry Pi projects
- ESP32 projects
- DIY IoT projects
Package Includes
- 1 × HC-SR501 PIR Motion Sensor Detector Module
Product Disclaimer
Product information provided on our website may not be entirely accurate as specifications can vary between manufacturers, suppliers, and production batches. Please verify the actual product specifications before using the module in critical applications.
Product images are for illustrative purposes only and may differ from the actual product in colour, component placement, dimensions, or other visual details.
This sensor is intended for general motion detection and should not be considered a standalone safety or security system for critical applications.
Important Note
Sensitivity Adjustment
Turn the sensitivity potentiometer clockwise to increase the detection distance up to approximately 7m. Turn it counterclockwise to reduce the range toward approximately 3m.
Time Adjustment
Turn the time-delay potentiometer clockwise to increase the output delay up to approximately 200 seconds. Turn it counterclockwise to reduce the delay toward approximately 5 seconds.
Warm-Up Period
After the sensor is powered on, allow approximately 30–60 seconds for the module to settle and calibrate to the surrounding infrared environment. False triggers may occur during this initial period.
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Frequently Asked Questions
1. What is the HC-SR501 PIR Sensor?
The HC-SR501 is a Passive Infrared motion sensor module designed to detect movement of humans and animals.
2. What is the operating voltage?
The module operates from 4.5V to 20V DC.
3. What is the detection range?
The detection range can be adjusted from approximately 3m to 7m.
4. Can the detection distance be adjusted?
Yes. The onboard sensitivity potentiometer allows the detection distance to be adjusted.
5. Can the output delay be adjusted?
Yes. The time-delay potentiometer allows the delay to be adjusted from approximately 5 seconds to 200 seconds.
6. What output does the sensor provide?
It provides a digital TTL output, with approximately 3.3V HIGH when motion is detected and 0V LOW when idle.
7. Can I use it with Arduino?
Yes. The HC-SR501 can be easily connected to an Arduino digital input.
8. Can I use it with ESP32?
Yes. It can be connected to an ESP32 GPIO, provided the signal voltage is suitable for the selected GPIO.
9. Can I use it with Raspberry Pi?
Yes. The sensor can be connected to a Raspberry Pi GPIO with appropriate voltage considerations.
10. What is the sensing angle?
The specified detection angle is less than 140°.
11. How much current does it consume?
The specified static current is less than 60µA.
12. Does the sensor need warm-up time?
Yes. Allow approximately 30–60 seconds after powering on for the sensor to stabilize.
13. Can it be used for automatic lights?
Yes. It is commonly suitable for motion-activated lighting and home automation projects.
14. Is the sensitivity fixed?
No. The HC-SR501 provides an adjustable sensitivity control, unlike compact fixed-parameter PIR modules such as the AM312.
15. What is included in the package?
The package includes 1 × HC-SR501 PIR Motion Sensor Detector Module.Only logged in customers who have purchased this product may leave a review.
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