DFRobot
5.8GHz Microwave Radar Module
The 5.8GHz Microwave Radar Module is a high-sensitivity motion detection sensor that transmits and receives 5.8GHz electromagnetic waves. By analysing the di...
The 5.8GHz Microwave Radar Module is a high-sensitivity motion detection sensor that transmits and receives 5.8GHz electromagnetic waves. By analysing the difference between transmitted and reflected signals, it reliably detects movement within its detection zone.
Unlike traditional PIR sensors that only respond to large body movements, this FMCW/CW microwave radar can detect subtle motion such as breathing, making it capable of true human presence detection — even when a person is sitting still or sleeping. Results are output via UART serial or digital I/O level.
Key Features
- Human Presence Detection – Detects micro-movements like breathing, not just walking
- Dual Modulation – Supports both FMCW and CW radar modes
- Wide Beam Angle – 120° × 120° detection cone covers large areas
- Long Range – Up to 11m detection distance
- Dual Output – UART serial (115200 baud) and digital I/O level output
- Compact Design – Just 20 × 18mm, easy to integrate into enclosures and projects
- Wide Temperature Range – Operates from −40°C to +85°C
Specifications
- Operating Frequency: 5.8GHz
- Modulation Mode: FMCW, CW
- Operating Voltage: 4.5–5.5V
- Operating Current: 22mA
- Detection Distance: 11m
- Equivalent Transmission Power: 3–5dBm
- Beam Angle: 120° × 120°
- Baud Rate: 115200
- Operating Temperature: −40°C to +85°C
- Dimensions: 20 × 18mm
Ideal For
- Smart lighting and occupancy-based automation
- Security and intrusion detection systems
- Home appliance presence sensing
- Hotel and building room occupancy monitoring
- Garage and parking detection
Package Contents
- 1× 5.8GHz Microwave Radar Module
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- baud
- Baud is the signalling rate of a serial connection, often used as the speed setting for UART communication. Matching the baud rate matters because both connected devices must use the same setting for readable data.
- FMCW
- Frequency-modulated continuous wave is a radar method that sends a changing radio signal and compares the reflection to estimate movement and distance. It matters for presence sensors because it can provide more detailed detection than a simple motion-only sensor.
- Motion detection
- A camera feature that checks the image for changes that suggest something has moved. It matters because your project can use movement as a trigger instead of constantly saving or processing every frame.
- UART
- UART is a simple serial connection that sends data over separate transmit and receive wires, often labelled TX and RX. It matters because this module is designed to replace a wired UART cable with a wireless link while keeping the same serial data format.
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Sensors & Input
Supplier page — dfrobot.com
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