Hi-Link HLK-LD2410S 24GHz Human Presence Radar Sensor - FMCW mmWave, GPIO/UART

The HLK-LD2410S requires a power supply between 3.0V and 3.6V DC. It is designed for direct compatibility with 3.3V logic systems commonly found in microcontrollers like ESP32, STM32, and Raspberry Pi. Exceeding this voltage range may damage the sensor's RF and processing circuitry.

The sensor provides two primary interfaces: GPIO for simple presence/no-presence digital output, and UART (TTL level) for advanced configuration and data reading. You can use UART commands to set parameters like detection range zones, motion/stillness sensitivity thresholds, and the data reporting refresh rate. A detailed UART protocol document is required for full configuration.

Yes, the HLK-LD2410S uses advanced mmWave FMCW technology and algorithms capable of detecting micro-motions, such as breathing or slight shifts, from stationary human targets. The maximum reliable detection range for a stationary person is up to 4 meters, while moving targets can be detected up to 8 meters.

At a 1 Hz reporting frequency, the sensor consumes an average current of just 0.1 mA, making it exceptionally suitable for battery-powered IoT and wireless sensor nodes. Its ultra-low power design allows for months or even years of operation on a single battery charge when paired with an efficient sleep/wake cycle.

The sensor offers a wide horizontal detection field of view of ±60 degrees (120 degrees total). For optimal coverage, it should be mounted flat on a wall, facing the area to be monitored. The detection pattern is fan-shaped, so mounting height and orientation significantly impact the effective coverage area.