HC-SR501 PIR Motion Sensor

HC-SR501 PIR Motion Sensor – Motion Detection Module

The HC-SR501 PIR Motion Sensor is a reliable and low-cost motion detection module designed to detect human and animal movement by sensing changes in infrared (IR) radiation. Built around Passive Infrared (PIR) technology, this sensor is widely used in security systems, automatic lighting, home automation, robotics, and energy-saving projects. When motion is detected within its sensing range, the module outputs a digital HIGH signal, making it easy to interface with Arduino, Raspberry Pi, ESP32, and other microcontrollers.

Featuring adjustable sensitivity and delay settings, the HC-SR501 allows users to customize the detection distance and output duration according to project requirements. Its wide operating voltage range and low power consumption make it ideal for both battery-powered and permanent installations.

Features

• Passive Infrared (PIR) motion detection
• Adjustable detection distance (up to 7 meters)
• Adjustable output delay time
• Wide operating voltage range (4.5V–20V DC)
• Low power consumption
• Repeatable and non-repeatable trigger modes
• Digital HIGH/LOW output signal
• Compatible with Arduino, Raspberry Pi, ESP32, and other development boards
• Easy 3-pin interface (VCC, OUT, GND)

Specifications

• Operating Voltage: 4.5V – 20V DC
• Output Voltage: 3.3V TTL
• Detection Distance: 3–7 meters (adjustable)
• Detection Angle: Up to 120°
• Delay Time: 3–300 seconds (adjustable)
• Trigger Modes: Single Trigger (L) / Repeat Trigger (H)
• Standby Current: Less than 60μA
• Operating Temperature: -20°C to +80°C
• Dimensions: Approximately 32mm × 24mm × 18mm

Applications

• Motion-activated lighting
• Security and burglar alarm systems
• Smart home automation
• Occupancy detection systems
• Robotics and automation projects
• Energy-saving control systems
• Visitor counters and monitoring devices

Package Includes:

• 1 × HC-SR501 PIR Motion Sensor Module