HLK-LD2402 24GHz Millimeter Wave AIoT Sensor GPIO UART
HLK-LD2402 24GHz Millimeter Wave AIoT Sensor GPIO UART
HLK-LD2402 24GHz Millimeter Wave AIoT Radar Sensor
The HLK-LD2402 is a compact, high-performance 24GHz millimeter wave radar module designed for intelligent human presence detection in smart home, AIoT, and automation applications. Measuring just 20 × 20mm and housed in a durable metal enclosure, this tiny powerhouse integrates seamlessly into embedded projects, smart devices, and IoT systems.
Using FMCW (Frequency Modulated Continuous Wave) radar technology, the LD2402 can accurately detect human targets within a defined space — distinguishing between stationary and moving occupants with impressive reliability. With built-in GPIO and UART interfaces, it connects easily to popular microcontrollers, development boards, and single-board computers for rapid prototyping and production deployment.
Key Features
- 24GHz Millimeter Wave Radar: Advanced FMCW technology for accurate, non-contact human presence sensing
- AIoT Ready: Designed for seamless integration into smart home and IoT automation systems
- Dual Interface Support: GPIO and UART interfaces for flexible connectivity with microcontrollers and SBCs
- Ultra-Compact Form Factor: Just 20 × 20mm — fits into space-constrained enclosures and PCB designs
- Durable Metal Construction: Robust build quality for reliable, long-term use
- Human State Perception: Detects both stationary and moving human targets within a set detection zone
- Low Power Consumption: Ideal for battery-powered and energy-conscious AIoT deployments
- Available in 2 Color Options: Choose the finish that suits your project aesthetic
Specifications
- Model: HLK-LD2402
- Frequency: 24GHz
- Detection Technology: FMCW Millimeter Wave Radar
- Dimensions: 20 × 20mm
- Material: Metal
- Interfaces: GPIO, UART
- Application: Human presence detection, smart home, AIoT automation
What's in the Box
- 1 × HLK-LD2402 AIoT Millimeter Wave Sensor Module
Ideal For
- Smart home automation and occupancy sensing
- AIoT development projects and prototyping
- Security and monitoring systems
- Lighting control and energy management triggers
- Embedded systems and IoT device integration
For more information on millimeter wave radar technology and its applications in smart sensing, visit the National Institute of Standards and Technology (NIST) — Electromagnetic Metrology.
Frequently Asked Questions
Q: What is the HLK-LD2402 millimeter wave sensor and what does it do?
A: The HLK-LD2402 is a 24GHz FMCW millimeter wave radar module engineered for intelligent human presence detection. It uses frequency modulated continuous wave technology to sense human targets — both stationary and moving — within a defined space, making it ideal for smart home automation, AIoT systems, and occupancy-triggered controls.
Q: What interfaces does the HLK-LD2402 support for connectivity?
A: The HLK-LD2402 is equipped with both GPIO and UART interfaces, enabling easy integration with a wide range of microcontrollers, development boards (such as Arduino, ESP32, Raspberry Pi), and embedded systems. This dual-interface design ensures flexible deployment across various AIoT and automation projects.
Q: How compact is the HLK-LD2402 sensor module?
A: The HLK-LD2402 features an ultra-compact footprint of just 20 × 20mm with a durable metal housing. This makes it an excellent choice for space-constrained enclosures, custom PCB designs, and any application where a small, reliable radar sensor is needed.
Q: What detection technology does the HLK-LD2402 use?
A: It uses FMCW (Frequency Modulated Continuous Wave) radar operating at 24GHz. This technology allows the module to accurately detect the presence and state of human occupants within a set detection zone — even when the target is relatively still — providing more reliable occupancy sensing than passive infrared (PIR) alternatives.