Product Description
The HC-SR501 PIR Motion Sensor Module is a Passive Infrared (PIR) sensor designed to detect movement by sensing changes in infrared radiation from objects within its field of detection.
When motion is detected, the module provides a digital output signal that can be read by a compatible microcontroller or control circuit. This makes it useful for projects where motion detection needs to trigger an action such as switching a light, activating an alarm, recording an event, or starting another automated process.
The module provides adjustable controls for detection sensitivity and output delay, allowing users to configure how the sensor responds to movement. Common HC-SR501 specifications include an adjustable detection range of approximately 3 to 7 metres and an adjustable delay period.
It is suitable for educational and prototyping applications involving Arduino, IoT, home automation, robotics, security concepts, and motion-activated systems.
Technical Specifications
- Technical Specification: Passive Infrared (PIR) motion detection with adjustable sensitivity and delay settings.
- Detection Range: Approximately 3–7 metres, adjustable.
- Output: Digital HIGH/LOW signal.
- Operating Voltage: 4.5–20V DC.
- Detection Angle: Approximately 110° cone.
- Delay Time: Adjustable according to module settings.
Detailed Product Specifications
| Specification | Details |
|---|---|
| Sensor Type | Passive Infrared (PIR) Motion Sensor |
| Model | HC-SR501 |
| Operating Voltage | 4.5–20V DC |
| Detection Range | Approximately 3–7m, Adjustable |
| Output Type | Digital HIGH/LOW |
| Output Level | Approximately 3.3V HIGH / 0V LOW |
| Detection Angle | Approximately 110° |
| Sensitivity | Adjustable |
| Delay Time | Adjustable |
| Trigger Mode | Selectable according to module configuration |
| Application | Motion Detection, Automation, IoT & STEM |
| Quantity | 1 Piece |
The HC-SR501 documentation and product references consistently describe the module as a PIR detector with adjustable range/sensitivity and delay controls.
Key Features
- Passive infrared motion detection
- Detects movement through changes in infrared radiation
- Adjustable detection sensitivity
- Adjustable output delay
- Digital HIGH/LOW output
- Adjustable detection range
- Suitable for microcontroller-based projects
- Useful for automation and IoT applications
- Suitable for security and motion-detection prototypes
- Beginner-friendly for sensor-based electronics projects
Recommended Applications
- Motion-activated lighting
- Automatic switching systems
- Security alarm prototypes
- Intrusion detection projects
- Smart home automation
- Occupancy detection
- Visitor detection
- Energy-saving automation
- IoT motion monitoring
- Robotics projects
- STEM and electronics experiments
Educational Applications
The HC-SR501 can help students learn:
- Passive infrared sensing
- Motion detection
- Digital sensor interfacing
- Microcontroller programming
- Conditional logic
- Automation systems
- IoT concepts
- Sensor-based security systems
- Smart lighting concepts
- Real-world event detection
Project Possibilities
The sensor can be used as the motion-detection input in projects such as:
PIR Sensor → Microcontroller → Program Logic → Output Device
For example, detected movement can be used to activate an LED, buzzer, relay-controlled device, display, or other compatible output.
What’s Included
- 1 × HC-SR501 PIR Motion Sensor Module
Important Notes
- The HC-SR501 detects changes in infrared radiation associated with movement; it should not be treated as an identification or facial-recognition sensor.
- Detection range and delay depend on the module’s adjustment settings and installation conditions.
- Avoid placing the sensor where unwanted heat or rapid environmental changes can cause unintended triggering.
- The module is intended for general-purpose electronics, educational, and prototyping applications.
- Use an appropriate supply voltage and ensure the connected controller is compatible with the module’s output signal.
Why Choose It?
The HC-SR501 PIR Motion Sensor Module provides a simple way to introduce motion detection into electronics and automation projects. Its adjustable sensitivity and delay controls allow students and makers to experiment with different motion-triggered behaviours without requiring complex sensing hardware.
It is a practical choice for Arduino, IoT, robotics, smart-home, security-prototype, and STEM education projects.
Product Summary
The HC-SR501 PIR Motion Sensor Module is a Passive Infrared motion detector with adjustable sensitivity, adjustable delay, approximately 3–7m detection range, and digital HIGH/LOW output. It is suitable for motion-activated lighting, automation, IoT, robotics, security prototypes, and STEM learning projects.
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