Hi-Link HLK-LD2420 24GHz Human Presence Radar Sensor Module (Millimeter Wave Motion Detection Module)

The Hi-Link HLK-LD2420 is a 24GHz millimeter-wave radar sensor module designed for accurate human presence detection, motion sensing, and micro-movement monitoring. Unlike conventional PIR sensors that only detect motion, the HLK-LD2420 can detect both moving and stationary human bodies by sensing subtle movements such as breathing and body micro-motion.

The module utilizes advanced radar signal processing technology and supports UART and GPIO interfaces, making it suitable for smart home automation, occupancy detection, security systems, IoT devices, and embedded sensing 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 20mm x 20mm module size

• Configurable detection range and sensitivity

• UART and GPIO communication support

• Suitable for smart home and IoT applications

Specifications -

• Product type - Human Presence Radar Sensor Module

• Model - HLK-LD2420

• Radar frequency - 24GHz ISM Band

• Technology - Millimeter Wave Radar Sensing

• Supply voltage - 3.0V to 3.6V DC

• Operating voltage - 3.3V DC

• Operating current - Approximately 50mA

• Motion detection distance - Up to 8m

• Presence detection distance - Up to 5m

• Module dimensions - 20mm x 20mm

• Interface type - UART and GPIO

Interfaces -

• VCC - 3.3V Power Supply Input

• GND - Ground Connection

• TX - UART Transmit Data

• RX - UART Receive Data

• OUT - Human Presence Detection Output Signal

Applications -

• Smart home automation systems

• Occupancy detection systems

• Lighting automation

• Security and alarm systems

• IoT sensor networks

• Energy-saving control systems

• Embedded presence detection projects