HC-SR501 Pyroelectric Infrared Sensor Module for Motion Detection with 33V Supply and Fast Response

The HC-SR501 human infrared module is a pyroelectric infrared sensor designed to detect human motion across a wide temperature range from -15 to 70 degrees Celsius. With a response time of just 1-3ms and precision of 1x2 degrees this sensor delivers reliable performance for security systems automatic lighting and motion-activated projects. Operating on a 33V power supply it provides a straightforward interface for integration into existing circuits or new builds making it a practical choice for both hobbyists and professionals.

Features and Construction

This infrared module comes in two variants SR501 blue board and SR501 green board offering flexibility for different applications. Its construction focuses on dependable motion sensing without unnecessary complexity.

Temperature Range and Response

The sensor functions effectively in temperatures from -15 to 70 degrees Celsius enabling use in both cold and moderate environments. The 1-3ms response time ensures near-instantaneous detection of movement suitable for time-sensitive applications like alarm triggers or automatic door openers.

Power and Precision

With a power supply voltage of 33V the module requires minimal setup and is compatible with many standard electronics projects. The precision rating of 1x2 degrees indicates accurate detection focused on human-scaled motion reducing false triggers from small animals or environmental changes.

Board Variants

Available as SR501 blue board or SR501 green board both share the same core specifications so you can choose based on availability or colour preference for your project. No performance difference exists between the two options.

Uses and Placement

This pyroelectric sensor is suited for indoor and outdoor applications where human presence detection is required. Its wide operating range and fast response make it versatile for security automation and energy-saving systems.

Security and Automation

Pair the sensor with an alarm or microcontroller to detect unauthorised entry or automate lighting in corridors and entrance areas. The quick response time minimises delay between movement and system reaction.

Everyday Home Use

Use the module for automatic lights in garages hallways or pantries where hands-free operation adds convenience. Its sensitivity and precision help avoid nuisance triggers from pets or passing vehicles.

Benefits and Buying Value

The HC-SR501 offers a cost-effective way to add motion detection to projects with minimal wiring and power requirements. Its straightforward design and available board colours simplify integration.

Reuse and Low Maintenance

Once installed the sensor requires little upkeep beyond occasional lens cleaning. Its solid-state construction means no moving parts to wear out making it suitable for long-term fixed installations.

Why Choose This Product

This module delivers reliable human detection across a broad temperature range at a fast response speed. The choice of blue or green board and simple 33V power connection make it an accessible component for electronics enthusiasts and professionals alike.