PIR Motion Sensor module (HC-SR501)

Overview

The PIR Motion Sensor Module (HC-SR501) is a versatile and efficient motion detection module used in various applications such as security systems, automatic lighting, and occupancy sensing. It utilizes Passive Infrared (PIR) technology to detect motion by sensing changes in infrared radiation emitted by nearby objects. The HC-SR501 module is known for its reliability, sensitivity, and ease of integration, making it a popular choice among electronics enthusiasts and professionals alike.

Key Features

1. Passive Infrared Technology:
   • Detects motion by sensing changes in infrared radiation emitted by objects in its field of view.
2. Adjustable Sensitivity and Delay Time:
   • Allows users to adjust sensitivity and delay time settings via onboard potentiometers, providing flexibility for different applications.
3. Wide Detection Range:
   • Effective detection range adjustable up to approximately 7 meters, depending on environmental factors.
4. Digital Output:
   • Provides a digital output (high or low) upon detecting motion, compatible with microcontrollers and logic circuits.
5. Low Power Consumption:
   • Operates on a low voltage (typically 5V DC) and consumes minimal power, suitable for battery-powered applications.
6. Compact and Lightweight Design:
   • Small form factor with dimensions approximately 32mm x 24mm, facilitating easy integration into various projects.
7. Simple Interface:
   • Requires minimal external components and interfaces easily with microcontrollers such as Arduino, Raspberry Pi, and ESP8266/ESP32.
8. Fast Response Time:
   • Responds quickly to motion detection, making it ideal for applications requiring rapid sensor feedback.

Applications

• Security Systems: Detects intruders and triggers alarms or notifications.
• Automatic Lighting: Activates lights when motion is detected, enhancing energy efficiency.
• Occupancy Sensing: Controls devices based on the presence or absence of individuals.
• Smart Home Automation: Integrates with home automation systems for enhanced convenience and security.

Specifications

• Sensor Technology: Passive Infrared (PIR)
• Operating Voltage: 4.5V to 20V DC
• Current Consumption: <50 μA in idle mode, <60 mA in active mode
• Detection Range: Adjustable up to approximately 7 meters
• Detection Angle: Approximately 120 degrees cone angle
• Output Type: Digital signal (high or low)
• Dimensions: Approximately 32mm x 24mm
• Weight: Lightweight and portable

Benefits

• Reliable Detection: Utilizes PIR technology for accurate and reliable motion detection.
• Flexible Settings: Adjustable sensitivity and delay time settings cater to various applications.
• Easy Integration: Simple interface and digital output streamline integration with microcontrollers and systems.
• Energy Efficient: Low power consumption extends battery life in portable applications.
• Versatile Use: Suitable for security, lighting control, and automation applications in both residential and commercial settings.

The PIR Motion Sensor Module (HC-SR501) is an essential component for projects requiring motion detection capabilities. Its robust features, compact design, and ease of use make it a preferred choice for enhancing security, automation, and energy efficiency in diverse applications.