HC-SR501 PIR Motion Sensor Module

HC-SR501 PIR Motion Sensor Module

Add reliable human and animal motion detection to your projects with the industry-standard HC-SR501 PIR Motion Sensor. This module is the most popular choice for creating security alarms, automatic lighting, and motion-activated devices due to its high sensitivity, low power consumption, and ease of use.

The HC-SR501 works on the principle of Passive Infrared (PIR), which detects the infrared radiation (heat) emitted by warm bodies. When a person or animal moves in front of the sensor, it triggers its output pin to a HIGH state. The white Fresnel lens on top focuses the infrared signals onto the sensor element, increasing its detection range and angle.

This module is highly configurable, with two onboard potentiometers to adjust the **sensitivity (distance)** and the **time delay** (how long the output stays HIGH after motion stops). A jumper also allows you to select between retriggering and non-retriggering modes, making it adaptable to a wide variety of applications.

Key Features:

• Model: HC-SR501
• Sensing Principle: Passive Infrared (PIR)
• Adjustable Sensitivity: Control the detection range from approximately 3 to 7 meters.
• Adjustable Time Delay: Control the output duration from a few seconds to several minutes.
• Wide Detection Angle: Approximately 120-degree cone.
• Interface: Simple 3-pin header (Power, Ground, Signal Output).
• Low Power Consumption: Ideal for battery-powered security systems.

Applications:

The HC-SR501 is perfect for a huge range of projects, including home security alarms, automatic door openers, motion-activated lights, visitor counters, and interactive props for escape rooms or exhibits.