Gravity: Arduino PIR (Motion) Sensor

A passive infrared (PIR) motion sensor from DFRobot's Gravity series. It detects infrared radiation from people and animals in motion and outputs a digital HIGH signal when movement is detected — ideal for security systems, occupancy sensing, and automated lighting projects.

The sensor operates at 3.3–5 V and uses DFRobot's Gravity 3-pin interface for plug-and-play connection to Arduino, Raspberry Pi, and other microcontrollers. An onboard LED lights up when motion is detected.

Key Features

• PIR Motion Detection – Detects human and animal movement via infrared
• 7 m Detection Range – 100° detection angle
• 3.3–5 V Operation – Compatible with both 3.3 V and 5 V logic
• Gravity Interface – PH2.0 3-pin connector for plug-and-play wiring
• Low Power – 15 µA working current
• LED Indicator – Lights when output is HIGH (motion detected)

Specifications

• Input Voltage: 3.3–5 V (6 V max)
• Working Current: 15 µA
• Output: Digital (HIGH 3 V / LOW 0 V)
• Output Delay: ~2.3–3 seconds (HIGH)
• Detection Angle: 100°
• Detection Distance: 7 m
• Pin Limit Current: 100 mA
• Connector: PH2.0 3-pin (Gravity)
• Module Size: 30 × 22 mm
• Operating Temperature: −20 to +85 °C

Ideal For

• Security and intrusion detection systems
• Occupancy-based automation (lighting, HVAC)
• Interactive installations and exhibits

Package Contents

• 1× Gravity Digital PIR Motion Sensor
• 1× Gravity Digital Cable

Resources

• PIR Motion Sensor Wiki (DFRobot)
• Schematic (PDF)