The HLK-LD2410B is a high-sensitivity 24GHz mmWave human presence radar module designed by Hi-Link Electronics. It uses FMCW (Frequency Modulated Continuous Wave) radar technology combined with advanced signal processing and human body sensing algorithms to detect both moving and stationary human presence. The module can sense micro-movements such as sitting, lying, or fretting and can provide human presence detection with a maximum sensing distance of up to 5-6 meters and a detection angle coverage of ±60 degrees.

Key features include:

• Detection of motion and micro-motion including sitting and lying human presence.

• Supports output via GPIO and UART interfaces.

• Plug-and-play design with visual configuration tools for adjusting sensing distance, sensitivity, and delay times.

• Power supply of 5-12V with low power consumption (approx. 80-200mA).

• Serial port default baud rate is 256000 (some versions 115200).

• Small size (minimum 7mm x 35mm) suitable for indoor smart applications like automated lighting, security, advertising screen wake-up, and safety alert systems.

• Resistant to environmental factors such as temperature, humidity, and light changes.

• Can penetrate non-metallic enclosures such as plastic, glass, and wood without performance loss.

• Certified for FCC and CE spectrum regulations.

This radar module is used mainly for indoor human presence sensing in smart homes, security, energy saving, and automation applications. It is popular for its ability to detect static humans and fine movements that traditional PIR sensors cannot sense, making it superior for presence and occupancy detection tasks.