Radar motion and presence sensor module 24GHz HLK-LD2420
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HLK-LD2420 - Radar module 24GHz for motion and micromotion detection
The compact HLK-LD2420 radar module operates in the 24 GHz band and is designed for precise detection of motion, micromotion, and constant human presence. It utilizes millimeter-wave (FMCW) technology and advanced signal processing algorithms, offering a detection range of up to 8 meters and communication via UART interfaces and digital inputs/outputs (GPIO). Thanks to its plug-and-play design, the module is perfect for Smart Home systems, intelligent lighting, and advanced AIoT applications.
Key features:
- Integrated SoC with an intelligent detection algorithm in the band 24 GHz ISM (FCC and CE compliant).
- Compact module size: 20 × 20 mm.
- Reliable detection of motion and subtle micromotions (e.g., breathing, slight body movements).
- Wide supply voltage range: 3,0 V - 3,6 V (typically 3,3 V) with an average current consumption of 50 mA.
- No blind zone: close-range detection from 0,2 m to a maximum of 8 m for motion.
- Wide detection angle: coverage of an area with an angle of ±60°.
- Ease of integration: UART and GPIO interfaces.
- Extensive configuration of zones, sensitivity, and delays (hold time) to reduce environmental interference.
Applications and possibilities
Due to its high precision, the HLK-LD2420 presence sensor is ideal for many Internet of Things (IoT) scenarios:
- Smart Home: intelligent control of home appliances and air conditioning based on the actual presence of household members.
- Smart Business: automatic wake-up of advertising screens or kiosks when a user approaches.
- Smart Security: intercoms, electronic door viewers, access control systems.
- Smart Lighting: precise control of lamps in public places, stairwells, and homes without the problem of lights turning off during inactivity.
Range and mounting options
The module supports ceiling and wall mounting, with the manufacturer's recommended method being ceiling installation (at a height of 2,7 - 3 m). In the default configuration, it offers a three-dimensional cone-shaped detection zone with a base radius of up to 5 m.
For wall mounting (height 1,5 - 2 m), the maximum sensor range is 8 m, covering an area with an angle of ±45° in the horizontal and vertical planes.
Pinout and interface
The HLK-LD2420 module provides a J2 connector for communication and power. The board also features an SWD interface (J1) dedicated to programming and debugging the MCU.
- 3V3: Power supply 3,0 V - 3,6 V (typically 3,3 V)
- GND: System power ground
- OT1 (UART_TX): UART interface data transmission (logic voltage 0 - 3,3 V)
- RX (UART_RX): UART interface data reception (logic voltage 0 - 3,3 V)
- OT2: Detection signal output pin (High state - person detected; Low state - no presence)
Technical specification
- Operating band: 24 GHz - 24,25 GHz
- Supply voltage: 3,0 V - 3,6 V DC
- Average current consumption: 50 mA
- Maximum radiated power: 11 dBm
- Distance measurement accuracy: ±0,35 m
- Refresh rate: 10 Hz
- Range (wall mounting): motion up to 8 m, micromotion up to 6 m
- Range (ceiling mounting): motion up to 5 m, micromotion up to 4 m
- Overall dimensions: 20 × 20 mm
- Operating temperature: from -40°C to +85°C
- Certifications and standards: compliance with FCC and CE requirements
Kit contents
- HLK-LD2420 radar presence sensor module - 1 pcs.
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