Czujnik ruchu i obecności człowieka HLK-LD2412 radar 24GHz Home Assistant

HLK-LD2412 24 GHz Smart Radar Sensor

The HLK-LD2412 module is a high-precision radar sensor operating in the 24 GHz band, designed to detect human presence. The device uses frequency-modulated continuous-wave (FMCW) technology, which allows for effective detection of both moving and stationary people. Advanced signal processing algorithms enable accurate distance measurement and interference filtering.

Thanks to its UART and GPIO interfaces (3.3V logic level), the sensor is fully compatible with popular microcontroller platforms. It is ideal as a module for the ESP8266, ESP32, Arduino, and Raspberry Pi.

Key Technical Features

The module features high sensitivity and extensive configuration options for detection parameters. The most important operating parameters are:

• Operating frequency: 24 GHz
• Supply voltage: DC 5V or 3.3V (3.3V logic voltage)
• Average current consumption: 90 mA
• Maximum detection range: up to 9 meters (configurable)
• Detection angle: up to ±75 degrees
• Distance measurement resolution: 0.75 m
• Communication interfaces: GPIO (3.3V) and UART (3.3V)
• Module dimensions: 11 mm x 28 mm
• Operating temperature: -40 to 85 degrees Celsius

Example Applications

Thanks to its compact size and high resistance to environmental interference, the sensor is widely used in modern electronic projects:

• Smart lighting systems that respond to presence in a room
• Building automation and Smart Home systems (AIoT)
• Advanced alarm systems and security monitoring
• Energy management in offices and public spaces
• Contactless switches and device control panels
• Monitoring the occupancy of workstations or parking spaces

Benefits of using the module

The choice of FMCW radar technology offers a number of advantages over traditional motion detection methods:

• High precision: Detects micro-movements and stationary people, unlike standard PIR sensors.
• Environmental resilience: Reliable operation regardless of temperature, humidity, or fluctuations in lighting levels.
• Flexible configuration: Multi-level sensitivity adjustment for different distance zones.
• Easy integration: Compact dimensions that facilitate wall or ceiling mounting in small enclosures.
• Quick setup: Plug-and-play operation and visual configuration tools available via computer.