PIR Motion Sensor HC-SR501

PIR Motion Sensor (HC-SR501) The HC-SR501 PIR (Passive Infrared) Motion Sensor is a compact electronic module designed to detect the movement of people or other warm objects by sensing changes in infrared radiation within its detection area. It uses a pyroelectric infrared sensor to detect variations in thermal energy caused by moving objects. The module provides a digital HIGH/LOW output, making it easy to interface with microcontrollers such as Arduino, ESP32, and Raspberry Pi. When motion is detected, the output signal becomes HIGH for a configurable period. The sensor also includes adjustable controls for sensitivity and time delay, allowing its detection range and output duration to be customized. Key Features: Sensor type: Passive Infrared (PIR) Operating voltage: Approximately 5 V DC Detection range: Up to approximately 7 meters Detection angle: Approximately 120° Output: Digital HIGH/LOW Adjustable sensitivity: Yes Adjustable time delay: Yes Applications: Automatic lighting, security systems, smart home automation, occupancy detection, and energy-saving systems Working Principle: The HC-SR501 detects changes in infrared radiation produced by moving objects. When a person enters or moves within its detection zone, the sensor detects the change and generates a HIGH-level output signal, which can be processed by a microcontroller to activate an alarm, light, fan, or other connected device.Reasonable price in Bangladesh