Hi-link HLK-LD2412 24Ghz Human Presence (Noise reduction 9M Distance) Radar Sensor Module
Hi-Link HLK-LD2412 24GHz Human Presence Radar Sensor Module – 9M Detection Range
The Hi-Link HLK-LD2412 24GHz Human Presence Radar Sensor Module utilizes advanced FMCW millimeter-wave radar technology to detect human presence, motion, and micro-movements with a sensing range of up to 9 meters. Featuring configurable sensitivity, UART and GPIO outputs, it is ideal for smart home, occupancy detection, lighting control, and security applications.
The HLK‑LD2412 is a millimeter‑wave radar module from Hi‑Link Electronics designed for detecting human presence — both moving and (to some extent) stationary or micro‑movements. It uses FMCW technology, has a relatively wide detection angle, and offers configurable sensing distance, sensitivity, and output modes. It supports both UART and GPIO outputs.
It’s aimed at indoor applications like smart lights, occupancy detection, security, etc.
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Description
The Hi-Link HLK-LD2412 24GHz Human Presence Radar Sensor Module is a high-performance millimeter-wave radar sensor designed for precise human presence detection. Using advanced FMCW (Frequency Modulated Continuous Wave) radar technology, the module can accurately detect moving, stationary, and micro-moving human targets while minimizing environmental interference and false detections.
Unlike traditional PIR sensors that only detect motion, the HLK-LD2412 can identify human occupancy even when a person remains still, making it ideal for modern smart home and building automation systems.
The module offers a maximum sensing distance of up to 9 meters, configurable distance gates, adjustable sensitivity settings, and customizable unmanned delay times. Through its UART communication interface, users can configure and monitor sensor parameters, while the GPIO output provides simple presence/no-presence signals for easy integration into automation projects.
With excellent adaptability, compact design, and reliable detection performance, the HLK-LD2412 is suitable for a wide range of smart sensing applications.
Key Features
Advanced 24GHz FMCW millimeter-wave radar technology
Detects human presence, motion, and micro-movements
Maximum sensing range up to 9 meters
Adjustable detection distance using configurable distance gates
Detection resolution of approximately 0.75m per gate
Configurable sensitivity levels (0–100)
Adjustable unmanned delay timing
Supports UART communication for configuration and monitoring
Supports GPIO output for direct presence indication
Accurate occupancy detection with reduced false triggering
Wide detection coverage for indoor environments
Reliable operation regardless of lighting conditions
Compact module design for embedded applications
Advantages Over PIR Sensors
Detects stationary humans and micro-movements
Higher detection accuracy and reliability
Not affected by darkness, sunlight, or ambient lighting
Adjustable sensing zones and sensitivity
Suitable for hidden installations inside devices
Better occupancy detection for smart automation
Applications
Smart Home Automation
- Intelligent lighting control
- Smart switches and occupancy sensing
- Automated appliance control
Occupancy Detection
- Meeting rooms
- Offices and commercial buildings
- Energy-saving systems
Security Systems
- Human intrusion detection
- Smart surveillance systems
- Restricted area monitoring
Smart Appliances
- Air conditioners
- Smart TVs
- Energy management systems
Commercial & Industrial Automation
- Occupancy-based lighting
- Building management systems
- Human presence monitoring
Technical Specifications
| Parameter | Value |
|---|---|
| Operating Frequency | 24GHz |
| Technology | FMCW Millimeter-Wave Radar |
| Detection Range | Up to 9m |
| Distance Resolution | 0.75m |
| Sensitivity Adjustment | 0 – 100 |
| Output Interface | UART + GPIO |
| Detection Type | Presence, Motion & Micro-Motion |
| Delay Time | Configurable |
| Installation | Indoor Applications |
| Configuration Tool | Supported |
Package Includes
1 × Hi-Link HLK-LD2412 24GHz Human Presence Radar Sensor Module
Why Choose HLK-LD2412?
The HLK-LD2412 offers a significant upgrade over traditional motion sensors by combining 24GHz mmWave radar technology, up to 9-meter detection range, configurable sensing zones, and accurate stationary human detection. Its ability to detect presence rather than just movement makes it the ideal solution for smart homes, intelligent lighting, occupancy monitoring, and advanced automation systems.
From the user manual and forum / user reports, these are the behaviors and parameters you can adjust or need to be aware of:
- Maximum distance / minimum distance: You can set these in “distance gates”. Each gate is 0.75 m. So if you set max = 2 gates, that means ~1.5 m, etc.
- Sensitivity: From 0‑100. The module measures some “energy” from target; if it’s above the sensitivity threshold, it counts as presence.
- Unmanned delay time: The delay after no presence before module reports “no human” or signals the absence. Configurable via serial protocol.
- Output modes:
- GPIO “OUT” pin for simple presence / non‑presence signal.
- UART output gives richer data, including maybe distance auxiliary info etc.
