HLK-LD2410B 24GHz Human Presence Radar Sensor Module

The HLK-LD2410B Human Presence Radar Module is a high-sensitivity 24GHz mmWave human presence sensor designed to detect both moving and stationary human presence. Unlike conventional PIR motion sensors, the LD2410B uses FMCW radar technology to detect subtle human movements and presence, making it suitable for smart lighting, room occupancy detection, automation, robotics, IoT, and security applications.

The module supports an adjustable sensing range of approximately 0.75m to 6m, with a detection angle of up to ±60° and a distance resolution of 0.75m. It provides both UART and GPIO output, allowing easy integration with popular development platforms such as Arduino, ESP32, ESP8266, STM32, Raspberry Pi and other microcontroller-based systems.

The HLK-LD2410B is especially useful for projects where detecting whether a person is actually present is more important than simply detecting movement. It can identify motion, micro-movement, and stationary presence, enabling smarter automation than traditional motion-only sensors.

For DIY electronics and engineering projects in Bangladesh, the compact size, configurable detection parameters, UART communication, GPIO output, and widely available development resources make the LD2410B 24GHz radar sensor a practical choice for smart-home and IoT experimentation.

Features:

• 24GHz FMCW millimeter-wave radar
• Human presence detection
• Detects moving and relatively stationary human presence
• Sensitive to micro-movements
• Adjustable detection distance
• Detection range up to 6 meters
• Detection angle up to ±60°
• 0.75m distance resolution
• UART serial communication
• 3.3V logic output
• GPIO presence output
• Configurable sensitivity for different distance zones
• Adjustable no-person delay
• Visual configuration and debugging tools
• Compact 7mm × 35mm module size
• Suitable for wall and ceiling installation
• Designed primarily for indoor applications

Specifications:

Specifications can vary slightly between hardware/firmware versions, so the seller’s supplied module and official Hi-Link documentation should be treated as the final reference.

How HLK-LD2410B Works

The LD2410B uses 24GHz FMCW radar to detect changes caused by a human body within its sensing area. Its signal-processing algorithms can distinguish human presence from simple environmental changes and provide real-time detection information.

This makes the sensor useful in applications where a person may remain relatively still. For example, a person sitting at a desk or remaining in a room can still be detected, whereas a traditional PIR sensor may stop detecting after movement ceases.

HLK-LD2410B vs PIR Sensor

For applications requiring presence detection rather than simple motion detection, the LD2410B can provide significantly more useful information than a basic PIR sensor.

Applications:

The HLK-LD2410B 24GHz radar sensor can be used in a wide variety of electronics and IoT projects:

Smart Home

• Automatic room lighting
• Occupancy detection
• Smart fan control
• Energy-saving automation
• Automatic appliance control

IoT Projects

• ESP32 presence sensor
• Arduino human detection
• Smart room monitoring
• Home automation
• IoT occupancy tracking

Robotics

• Human detection
• Robot proximity awareness
• Indoor navigation projects
• Human-following experiments
• Intelligent automation

Security

• Human presence detection
• Room occupancy monitoring
• Restricted-area detection
• Intrusion alerts

Commercial & Industrial

• Automatic display activation
• Energy management
• Occupancy-based automation
• Smart office systems
• Automated lighting systems

Hi-Link lists applications including lighting control, smart appliances, advertising-screen wake-up, intelligent security and other human-presence applications.

Arduino, ESP32 & Microcontroller Compatibility

The HLK-LD2410B can be integrated into projects using microcontrollers that provide suitable UART and 3.3V logic interfaces. It is particularly popular among developers working with:

• Arduino
• ESP32
• ESP8266
• STM32
• Raspberry Pi
• Other UART-compatible microcontrollers

Hi-Link also provides an Arduino library, configuration software, serial communication documentation and related development resources.

Important Voltage Note

The module's specified power supply is 5V, while its UART/GPIO logic is 3.3V. When connecting it to a microcontroller, always verify the logic-level requirements of your specific development board.