Hi-Link HLK-LD2420 24GHz Human Body Micro Motion Sensing Detection Radar Module

The Hi-Link HLK-LD2420 is a millimeter wave radar sensor designed to detect human presence and micro movements such as breathing or slight body motion. Unlike traditional PIR sensors that only detect motion, this radar module can also detect stationary humans, making it ideal for smart automation and occupancy sensing systems.

The module operates in the 24GHz ISM band and uses advanced radar signal processing to detect moving and static human bodies within a specified detection zone. It supports UART and GPIO interfaces which makes it easy to integrate with microcontrollers such as Arduino/ESP32/Raspberry Pi for IoT and smart home applications.

Key Features

• 24GHz millimeter wave radar human presence sensor
• Detects motion micro motion and stationary human presence
• Maximum sensing distance up to 8m
• Real time human presence detection
• Compact module size 20mm x 20mm
• Configurable detection range sensitivity and refresh rate
• Suitable for smart home automation and IoT systems

Specifications

• Model = HLK-LD2420
• Radar Frequency = 24GHz ISM band
• Supply Voltage = 3.0V-3.6V
• Operating Voltage = 3.3V
• Operating Current = About 50mA
• Motion Detection Distance = Up to 8m
• Presence Detection Distance = Up to about 5m
• Module Size = 20mm x 20mm
• Technology = Millimeter wave radar sensing

Interfaces

• VCC = Power supply input 3.3V
• GND = Ground connection
• TX = UART transmit data
• RX = UART receive data
• OUT = Human presence detection output signal