Hi-Link HLK-LD2410C-P 24GHz Human Presence Radar Sensor

Unlike PIR sensors which only detect moving heat sources, the HLK-LD2410C-P uses 24GHz FMCW radar technology to detect both moving and stationary human presence, including subtle movements like breathing. This makes it ideal for applications requiring accurate occupancy detection even when people are still, such as in meeting rooms or libraries. It also provides distance information and is less affected by ambient temperature changes.

The module is configured via its UART interface using the provided visual configuration tools on a PC or through a Bluetooth connection. You can set the maximum detection range, define up to multiple distance zones, and adjust the sensitivity independently for each zone to ignore interference (like moving fans). The unmanned delay time can also be programmed to determine how long after the last detection the output signal should change state.

The module provides two primary output methods: a UART (TX/RX) serial interface for detailed data (presence status, distance, etc.) and a GPIO pin that toggles high/low based on the detection state. To connect to an Arduino, you can use the SoftwareSerial library to read the UART data on any digital pins, or simply read the GPIO pin as a digital input. The module typically operates on 5V DC logic levels.

While the exact voltage range is not specified in the provided data, similar 24GHz radar modules from Hi-Link typically operate from a 5V DC supply. It is crucial to consult the official Hi-Link datasheet for the HLK-LD2410C-P to confirm the exact input voltage limits (e.g., 3.3V to 5V) and current consumption to ensure stable operation and prevent damage to the sensor.

The HLK-LD2410C-P is primarily designed for indoor scenes as stated in its description. It lacks a specified IP rating for dust and water resistance, making it unsuitable for outdoor or harsh industrial environments exposed to moisture, dust, or extreme temperatures. For such applications, an industrial-grade radar sensor with a proper IP67 or IP68 enclosure and a wider operating temperature range would be required.