HR-SC505 Mini Infrared PIR Motion Sensor

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The HC-SR505 is a tiny motion detector module that uses a Passive Infrared (PIR) sensor. It’s designed to detect the infrared energy (body heat) emitted by people and animals. Its small size and very low power consumption make it perfect for battery-operated and compact projects.

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How It Works

The sensor detects changes in the infrared levels in its detection area. When a person or animal moves in front of it, this change triggers the module. It then sends a HIGH signal (usually 3.3V) on its output pin for a fixed duration (typically around 8 seconds) before returning to a LOW state.

Key Features

Type: Passive Infrared (PIR) Motion Sensor
Operating Voltage: 4.5V to 20V DC
Power Consumption: Very low (<60uA), ideal for battery power.
Detection Range: Up to 3 meters.
Detection Angle: Less than 100 degrees.
Output: Digital HIGH/LOW signal.
Size: Extremely small (about 10mm x 23mm).

In short, it’s a simple, low-cost, and efficient “set-and-forget” motion sensor for projects that need to be aware of the presence of people or animals, such as automatic lighting, security alarms, and interactive installations.

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