HLK-LD2402 24GHz Millimeter Wave Radar Presence Sensor Module

HLK-LD2402 24GHz Millimeter Wave Human Presence Detection Radar Module

The HLK-LD2402 is a compact, high-sensitivity 24GHz millimeter wave radar sensor module designed for intelligent human presence detection in AIoT applications. Using FMCW (Frequency Modulated Continuous Wave) technology combined with advanced signal processing and precise human-sensing algorithms, this module can reliably detect both moving and stationary human targets within a defined space — making it ideal for smart home, security, and energy-saving systems.

With GPIO and UART interfaces, simple serial ASCII output, and a compact 20×20mm metal form factor, integrating this module into your embedded or IoT project is straightforward and efficient. Made in Mainland China.

Key Features

• Frequency: 24G – 24.25GHz
• Sweep Bandwidth: 250MHz (CE/FCC compliant)
• Modulation: FMCW
• Detection Angle: ±60°
• Detection Distance: Presence & movement up to 5m / movement up to 8–10m (typical)
• Distance Resolution: 0.15m (typical)
• Supply Voltage: 3.3V (typical)
• Dimensions: 20 × 20mm
• Operating Temperature: -40°C to +85°C
• Data Format: Serial port ASCII output
• Interface: Default 2.54mm × 5-Pin
• Material: Metal

Application Scenarios

The HLK-LD2402 is perfectly suited for a wide range of AIoT use cases, including:

• 🏠 Intelligent lighting control (auto on/off based on occupancy)
• 📺 Advertising screen wake-up and power management
• 🔒 Security and intrusion detection systems
• ⚡ Smart home appliance energy-saving automation
• 🛡️ Life safety monitoring and alert systems

What's in the Box

• Option 1: 1× HLK-LD2402 Radar Module
• Option 2: 1× HLK-LD2402 Radar Module + 1× Connection Cable
• (2-pack options also available)

Why Choose the HLK-LD2402?

Unlike passive infrared (PIR) sensors, this millimeter wave radar module can detect completely still individuals — such as a person sitting or sleeping — not just motion. Its wide ±60° detection cone, long range, and robust -40°C to +85°C operating temperature range make it reliable across both indoor and outdoor environments. The compact 20×20mm footprint fits easily into space-constrained enclosures, and the standard 2.54mm pin header ensures drop-in compatibility with most development boards.

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Frequently Asked Questions

Q: Can the HLK-LD2402 radar module detect stationary (non-moving) people?

A: Yes. The HLK-LD2402 uses FMCW millimeter wave radar technology combined with advanced human-sensing algorithms specifically designed to detect both moving and completely stationary human targets, such as someone sitting still or sleeping — making it far more capable than standard PIR motion sensors.

Q: What interfaces does the HLK-LD2402 support?

A: The HLK-LD2402 supports both GPIO and UART interfaces via a standard 2.54mm × 5-Pin header, and outputs data as serial ASCII, making it easy to integrate with microcontrollers, development boards (such as Arduino or ESP32), and other embedded systems.

Q: Is the HLK-LD2402 certified for use in consumer electronics products?

A: Yes. The module operates within a 250MHz sweep bandwidth that is compliant with CE and FCC certification standards, making it suitable for integration into consumer and commercial AIoT products.

Q: What is the maximum detection range of this radar module?

A: The HLK-LD2402 can detect presence and movement up to approximately 5 meters, and movement-only detection up to 8–10 meters (typical values). The detection angle covers ±60°, providing a wide field of sensing coverage.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.