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...
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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
- The ability to sense that something has moved, either by comparing successive camera frames or by using a dedicated sensor such as a PIR (infrared) or radar module. When a product lists motion detection, movement can be used as a trigger so a system only acts or records when there is activity rather than running continuously.
- UART
- UART is a simple asynchronous serial interface that sends data over separate transmit and receive wires, usually labelled TX and RX, with both ends set to the same baud rate. It is a common way for microcontrollers and other serial devices to exchange data.
Find this product in
Sensors & Input
Supplier page — dfrobot.com
Supplier Description · 664.4 KB · Click any page to view full size
SEN0521 5 8ghz microwave radar module datasheet v1
Datasheet · 585.2 KB · Click any page to view full size
Source Code
Open-source libraries, firmware & example projects for this product
5,8 ghz human radar detection
a17cf21
about 4 years ago
· 2 commits
- examples first commit about 4 years ago
- DFRobot_Microwave_Radar_Module.cpp first commit about 4 years ago
- DFRobot_Microwave_Radar_Module.h first commit about 4 years ago
- keywords.txt first commit about 4 years ago
- LICENCE first commit about 4 years ago
- README.md Update README.md about 4 years ago
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