PIR Motion Sensor Module HC-SR501

HC-SR501 Infrared Motion Sensor Module for Automation

The HC-SR501 Infrared Motion Sensor Module is a widely used, cost-effective, and reliable solution for detecting human body movement using passive infrared (PIR) technology. Ideal for home automation, security systems, lighting control, robotics, and DIY electronics, it offers adjustable delay and sensitivity settings for flexible applications. Available at Bigyan Project, this sensor module ensures you get authentic components with dependable quality for all your electronics projects.

Product Specifications

Features

• Adjustable delay time and sensitivity for custom applications
• Wide operating voltage range supports various power sources
• Low quiescent current for energy-efficient designs
• Compact module size suitable for embedded projects
• Reliable detection of human body motion using PIR technology
• Simple digital output for easy integration with microcontrollers
• Stable performance even in varying ambient conditions

Applications / Use Cases

• Smart home automation for automatic lighting control
• Security alarm and intrusion detection systems
• Human presence detection in energy-saving systems
• DIY electronics and robotics projects with Arduino and Raspberry Pi
• Commercial and industrial automation systems
• Automatic door opening systems

User Guide / How to Use

Using the HC-SR501 is simple. Connect the VCC and GND pins to your power supply (DC 4.5–20V). Connect the OUT pin to your microcontroller's input pin. Adjust the two onboard potentiometers to set the delay time and sensitivity to your desired level. Select the trigger mode using the onboard jumper—set to H for repeatable triggering or L for single triggering per detection event. Once connected, the sensor outputs a HIGH signal when motion is detected, making it easy to control lights, alarms, or other devices.

Frequently Asked Questions (FAQs)

• What is the detection range of the HC-SR501?
• The sensor can detect motion up to 7 meters with a cone angle of approximately 100°.
• Can I adjust the delay time?
• Yes, the delay time is adjustable between 5 to 200 seconds using the onboard potentiometer.
• Is it compatible with Arduino and Raspberry Pi?
• Yes, it provides a simple digital output that works perfectly with Arduino, Raspberry Pi, and other microcontrollers.
• What is the default trigger mode?
• By default, the sensor is set to repeatable trigger mode (H), which can be changed as needed.

Challenges and Considerations

• The sensor may trigger falsely in environments with rapid temperature changes
• Lens contamination can reduce detection accuracy
• Requires careful positioning to avoid blind spots
• May require tuning delay and sensitivity settings for optimal results
• Performance can vary slightly between units

Compatibility

• Arduino Uno, Nano, Mega
• Raspberry Pi models
• ESP8266 and ESP32
• Other 3.3V and 5V microcontrollers
• Relay modules and automation controllers

Future Enhancement Options

• Integrate with wireless modules for remote monitoring
• Combine with cameras for smart surveillance systems
• Add machine learning algorithms for advanced motion detection
• Integrate with home automation hubs and IoT platforms
• Develop low-power battery-operated designs for remote installations

Benefits

• Cost-effective solution for reliable motion detection
• Easy to integrate with popular development boards
• Adjustable settings for flexible use
• Low power consumption suitable for energy-saving designs
• Widely available and supported by the maker community including Bigyan Project

Conclusion

The HC-SR501 PIR Motion Sensor Module is a proven, affordable, and highly effective component for motion detection in a wide range of projects. Whether you're working on home automation, security systems, or robotics, this sensor offers reliable performance and easy integration. Bigyan Project is committed to providing authentic, high-quality components to help you bring your ideas to life with confidence. Choose the HC-SR501 for your next project and experience dependable motion detection with flexible control options.