HLK-LD2420 24GHz Human Presence Radar Sensor Module

The Hi-Link HLK-LD2420⁠ is an advanced 24GHz millimeter-wave radar sensor module designed for highly accurate human presence detection. Unlike traditional PIR sensors, the HLK-LD2420 can detect both movement and stationary human presence through micro-motion sensing technology.
Using FMCW radar technology, the module can identify human motion, occupancy, and even subtle body movements like breathing, making it ideal for smart lighting, security monitoring, occupancy sensing, and energy-saving automation systems.
The compact design, UART communication interface, and configurable sensing parameters allow easy integration with ESP32, Arduino, STM32, Raspberry Pi, Home Assistant, and other embedded platforms.
Features
24GHz millimeter-wave radar technology
Detects both moving and stationary humans
High sensitivity micro-motion detection
Better accuracy than PIR sensors
UART communication interface
Low power consumption
Adjustable detection parameters
Supports firmware configuration tools
Compact SMD module design
Suitable for smart home and IoT projects
Specifications
Model: HLK-LD2420
Operating Voltage: 5V
Frequency: 24GHz
Detection Type: Human presence & motion
Communication Interface: UART
Detection Distance: Up to 6m
Detection Angle: Approx. ±60°
Operating Temperature: -40°C to +85°C
Output Type: UART / GPIO
Installation: Indoor use
Applications
Smart Home Automation
Human Presence Detection
Smart Lighting Systems
Security & Alarm Systems
Automatic Display Wake-Up
Energy Saving Systems
IoT Occupancy Detection
Home Assistant Projects