PIR Motion Sensor Module HC-SR501
50.00 EGP
he PIR Motion Sensor Module HC-SR501 is a reliable, affordable, and easy-to-use infrared motion detector that belongs in every electronics toolkit. With its wide detection range, adjustable settings, low power consumption, and compatibility with Arduino and Raspberry Pi, it is perfect for DIY, robotics, security systems, smart homes, and STEM education.
Whether you are a hobbyist experimenting with Arduino, a student learning electronics, or a professional building security solutions, the HC-SR501 PIR sensor provides the accuracy, flexibility, and efficiency you need.
Description
PIR Motion Sensor Module HC-SR501
The PIR Motion Sensor Module HC-SR501 is one of the most widely used and affordable motion detection modules for electronics, DIY projects, and security systems. PIR stands for Passive Infrared Sensor, which means the module detects motion by sensing changes in infrared radiation (heat) emitted by objects, such as the human body. This makes it an ideal choice for applications like automatic lighting, burglar alarms, and smart home automation.
Compact, reliable, and easy to use, the HC-SR501 motion sensor is a must-have component for hobbyists, students, and professionals working on projects involving movement detection.
How the HC-SR501 PIR Sensor Works
The HC-SR501 module uses a pyroelectric sensor to detect infrared radiation levels in its field of view. When a warm body, such as a human or animal, moves in front of the sensor, the infrared radiation pattern changes. The sensor detects this change and outputs a signal, which can then be used to trigger another device—such as a light, buzzer, or microcontroller input.
This working principle makes the PIR sensor highly reliable for motion detection without requiring direct contact.
HC-SR501 vs Other PIR Sensors
| Feature | HC-SR501 | HC-SR505 | AM312 |
|---|---|---|---|
| Detection Range | Up to 7m | ~3m | ~5m |
| Detection Angle | 120° | 100° | 100° |
| Adjustable Sensitivity | ✅ Yes | ❌ No | ❌ No |
| Adjustable Delay Time | ✅ Yes | ❌ No | Limited |
| Operating Voltage | 5–20V | 4.5–20V | 3–5V |
| Best Use Case | DIY, Security, Smart Homes | Small devices | Low-power IoT |
The comparison shows that the HC-SR501 offers superior range and flexibility, making it the best choice for most DIY and professional projects.
Features of PIR Motion Sensor Module HC-SR501
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Operating Voltage: 4.5V – 20V DC, making it compatible with most microcontroller boards like Arduino, ESP8266, and Raspberry Pi.
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Detection Range: Adjustable from 3 to 7 meters.
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Detection Angle: Approximately 120°, providing wide coverage.
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Output: Digital output (HIGH when motion is detected, LOW otherwise).
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Delay Time Adjustment: Adjustable delay (from 3 seconds up to 5 minutes) to control how long the output remains HIGH after motion is detected.
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Trigger Modes: Supports both repeatable and non-repeatable trigger modes.
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Compact Size: Small, lightweight module suitable for integration in compact projects.
Adjustable Settings
The HC-SR501 module comes with two onboard potentiometers:
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Sensitivity Adjustment: Controls the detection distance.
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Time Delay Adjustment: Sets how long the output stays active after motion detection.
This makes the module customizable for various projects—whether you need short trigger times for quick responses or long delays for applications like automatic lighting.
Applications of PIR Motion Sensor Module HC-SR501
The versatility of the PIR motion sensor makes it suitable for numerous applications, including:
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Security Systems: Motion-activated alarms, intruder detection, and surveillance systems.
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Home Automation: Automatic lighting systems that switch on when someone enters a room.
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Energy Saving: Turning devices on or off automatically when motion is detected.
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Robotics: Adding motion-detection features to smart robots.
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IoT Projects: Integration with smart devices for real-time automation.
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Public Spaces: Automatic lighting in corridors, washrooms, and offices.
Benefits of Using HC-SR501
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Energy Efficient: Helps reduce power consumption by activating devices only when needed.
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Affordable: Provides reliable motion detection at a low cost.
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Beginner-Friendly: Simple digital output makes it easy to interface with microcontrollers.
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Adjustable and Flexible: Customizable settings for sensitivity and delay.
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Wide Compatibility: Works with Arduino, Raspberry Pi, ESP8266, and other development boards.
Conclusion
The PIR Motion Sensor Module HC-SR501 is a must-have component for anyone working on DIY electronics, home automation, or security projects. With its wide detection range, adjustable sensitivity, low power consumption, and ease of use, it offers an excellent balance of performance and affordability.
Whether you are a hobbyist building a smart lighting system, a student learning about sensors, or a professional developing a security application, the HC-SR501 provides reliable and efficient motion detection for countless projects.
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