HCSR501 PIR Motion Sensor

MOTION DETECTION PRINCIPLE: Utilizes a pyroelectric infrared sensing element to detect motion by sensing changes in infrared radiation emitted by human bodies
DETECTION RANGE: Capable of detecting motion within a distance of approximately 3 m to 7 m, depending on environmental conditions and sensor configuration
POWER SPECIFICATIONS: Operates within a 4.5V to 20V DC supply range with very low current consumption of about 60 µA, making it highly energy-efficient
INTERFACE DESIGN: Provides a digital output signal that switches HIGH when motion is detected and returns LOW after the preset delay period
PIN CONFIGURATION: Features a 3-pin interface (VCC, OUT, GND) for direct connection with Arduino, ESP32, Raspberry Pi, AVR, PIC, and 8051 microcontrollers
DELAY ADJUSTMENT: Includes an adjustable time delay setting from approximately 3 seconds to 5 minutes, allowing customization of motion detection response time
TRIGGER MODE CONTROL: Equipped with a repeat trigger selection jumper, enabling either single trigger or continuous trigger detection modes
OPTICAL DESIGN: Incorporates a dome-shaped Fresnel lens that expands the detection area and improves sensitivity to motion
MODULE DIMENSIONS: Compact module measuring approximately 32 × 24 × 18 mm, suitable for integration into embedded and automation systems
APPLICATION SCOPE: Widely used in security alarm systems, automatic lighting control, smart home automation, motion-activated devices, energy-saving systems, and robotics projects