HLK-LD2412 mmWave Sensor

The ultimate presence sensor for every application

Do you ever find yourself sitting quietly in a room, waving your arms because the lights have gone out again? The LD2412 mmWave sensor puts an end to that problem once and for all. This module uses advanced 24GHz radar technology to detect even the smallest micro-movements—like breathing. The result is foolproof, true presence detection.

This module is a powerful, versatile solution for any home automation enthusiast. Use it as a simple plug-and-play upgrade for your Apollo R PRO-1 , or as the heart of your own DIY home automation project.

The LD2412 mmWave Sensor is very simple to install in an Apollo R Pro-1 , click here for the manual.

Key Benefits

• True presence detection : Unlike traditional PIR sensors, the LD2412 detects not only motion but also actual presence. Even if you're sitting still, the sensor knows you're there, making your automations smarter and more reliable.
• Plug-and-play for Apollo R PRO-1 : This seamless upgrade is specifically designed for owners of the Apollo R PRO-1 PoE Multisensor . Simply click the module directly into the designated socket, and your sensor will instantly become significantly more powerful.
• Perfect for DIY & Home Assistant : Thanks to its standard GPIO and UART connections, the LD2412 is ideal for your own projects with an ESP32, ESP8266, or Arduino. Integrate it effortlessly into ESPHome for full control within Home Assistant.
• High precision and long range : The sensor has a wide detection range of up to 9 meters and a viewing angle of ±75 degrees, making it suitable for most rooms. Easily configure the sensitivity and range via software to perfectly tailor the operation to your environment.
• Note : The high sensitivity of mmWave can be a drawback. The sensor sometimes requires some fine-tuning in the software (e.g., ESPHome) to ignore detection through thin walls or the movement of a fan.

Practical application: the perfect office or bathroom automation

Whether you use the Apollo R PRO-1 or build your own ESPHome sensor, the application is equally powerful:

The light turns on as soon as you enter the room. As long as the sensor detects your presence—even if you're sitting still at your desk or reading a book in the bath—the light stays on. Only when you leave the room and no more presence is detected do the lights automatically turn off. No more unnecessary energy consumption and no more frustrating waving.

Technical specifications

• Technology : 24 GHz FMCW millimeter-wave radar
• Detection range : Adjustable, up to 9 meters
• Viewing angle : ±75 degrees
• Interface : GPIO & UART (for DIY), Direct Integration (for Apollo R PRO-1 )
• Power supply : 3.3V or 5V
• Compatibility : Apollo R PRO-1 (plug and play), various microcontrollers such as ESP32/ESP8266 (DIY)
• Platform support : Fully compatible with Home Assistant (via ESPHome) and other home automation platforms.

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