Hi-Link HLK-LD2420 24GHz mmWave Motion and Presence Sensor

Description

The HLK-LD2420 is a compact, high-performance mmWave radar module designed for detecting human motion and presence — including micro-movements such as sitting or standing still — with a range up to 8 m.

It integrates a complete signal processing chain on-chip, providing accurate real-time detection via UART and a simple presence output via GPIO. Its advanced filtering and configurable zone masking make it suitable for complex environments. The module operates at 3.3 V and is plug-and-play with default parameters, but can also be tuned using the official PC tool.

Ideal for smart home, touchless interfaces, and indoor automation systems where high sensitivity and minimal false triggers are key.

Specifications

• Technology: 24GHz mmWave radar (single Tx/Rx)

• Detection Range: Motion up to 8 m, Presence (micro-motion) up to ~5 m (realistic)

• Resolution: 12 zones, user-configurable

• Outputs: UART (3.3 V logic), GPIO presence signal

• Supply Voltage: 3.0–3.6 V

• Power Consumption: ~50 mA

• Dimensions: 20 mm × 20 mm

• Angle Coverage: ±60°

• Configuration Tool: PC visual configuration software

• Special Features: Real-time result reporting, Interference shielding via configurable zone masks

Use cases

• Turn lights on/off when someone enters or leaves a room

• Detect presence in a room even if the person is not moving

• Save power by putting devices to sleep when nobody’s around

• Wake up a screen or device when someone approaches

• Control fans, lights, or speakers with motion or presence

• Make your project react to someone sitting at a desk or lying in bed

• Trigger alerts or automations when someone enters a zone

• Detect people behind plastic or acrylic enclosures

• Replace PIR sensors for better accuracy and reliability indoors

• Build touchless controls for displays, doors, or gadgets

Comparison