PIR Motion Detector Sensor Module HC-SR501

Overview

A passive infrared (PIR) motion sensor module — detects movement by sensing changes in infrared radiation, the classic sensor behind motion-activated lights and alarms.

Key Specs

Pinout

VCC, GND, OUT (digital)

Features

• Adjustable sensitivity and delay-time potentiometers
• Selectable trigger mode (repeatable vs. single trigger) via a jumper

Compatible With

Arduino, ESP32, ESP8266, Raspberry Pi

Use Cases

• Motion-activated lighting
• Security/alarm systems
• Automatic door or gate triggers

FAQ

How do I adjust sensitivity and delay? Two onboard potentiometers — one for detection range, one for how long the output stays HIGH after triggering.