HC-SR501 PIR Motion Sensor Module with Adjustable Case

The HC-SR501 PIR Motion Sensor Module is a compact, high-sensitivity infrared detection component designed for smart home DIY projects, security alarms, automatic lighting systems, and Raspberry Pi builds. Whether you're a hobbyist, maker, or electronics enthusiast, this adjustable module delivers precise, reliable motion detection right out of the box.

Key Features

• High-Transmittance Fresnel Lens: The HDPE Fresnel optical lens expands the sensing range and accurately captures infrared signals, dramatically reducing false trigger rates for consistent performance.
• Adjustable Sensitivity & Time Delay: Two onboard potentiometers let you fine-tune detection distance and trigger duration to suit your specific project needs.
• Protective Case Included: The compatible enclosure shields the sensor module from dust and accidental contact, making it ideal for both prototyping and finished installations.
• Wide Compatibility: Works seamlessly with Raspberry Pi, Arduino, and other popular microcontroller platforms for fast, straightforward integration.
• Low Power Consumption: Energy-efficient design makes it suitable for battery-powered and continuous-use applications alike.
• Easy Plug-and-Play Setup: Standard 3-pin interface (VCC, GND, OUT) means no complex wiring — ideal for beginners and experienced builders.

Ideal Applications

• DIY home security alarm systems
• Automatic lighting control (lights on/off with motion)
• Smart door/entry detection
• Raspberry Pi and Arduino motion-triggered projects
• Educational electronics experiments

Specifications

• Model: HC-SR501
• Detection Method: Passive Infrared (PIR)
• Operating Voltage: 4.5V – 20V DC
• Output Signal: Digital (High/Low)
• Lens Type: High-transmittance HDPE Fresnel optical lens
• Case Material: Compatible protective enclosure included

For guidance on safe DIY electronics practices and working with low-voltage components, visit the U.S. Consumer Product Safety Commission (CPSC) for consumer safety resources.

Frequently Asked Questions

Q: What is the HC-SR501 PIR Motion Sensor Module used for?

A: The HC-SR501 is a passive infrared (PIR) motion sensor module widely used in DIY electronics projects such as smart home security alarms, automatic lighting control, entry detection systems, and Raspberry Pi or Arduino-based builds. It detects movement by sensing changes in infrared radiation emitted by people or animals within its field of view.

Q: Is the HC-SR501 compatible with Raspberry Pi and Arduino?

A: Yes! The HC-SR501 PIR sensor module is compatible with Raspberry Pi, Arduino, and most other microcontroller platforms. It uses a simple 3-pin interface (VCC, GND, OUT) that makes integration quick and straightforward, even for beginners starting their first DIY electronics project.

Q: Can I adjust the sensitivity and detection range on this sensor?

A: Absolutely. The HC-SR501 module features two onboard potentiometers — one for adjusting detection sensitivity (distance) and one for setting the trigger time delay. This allows you to customize the sensor's behavior to perfectly match your project requirements.

Q: What does the included protective case do?

A: The compatible protective case shields the HC-SR501 sensor module from dust, debris, and accidental physical contact. It's ideal for both prototyping stages and more permanent installations, helping to extend the module's lifespan and maintain reliable performance over time.