Hi-Link HLK-LD6001C 60GHz Head Counting Radar Sensor - TTL Serial

The HLK-LD6001C operates on a 3.3V DC power supply. It is important to use a stable, regulated 3.3V source, as exceeding this voltage can damage the module. The average power consumption is low, typically around 0.3W, making it suitable for battery-powered or energy-efficient applications.

The module communicates via a TTL-level serial (UART) interface. You will need to connect the module's TX and RX pins to a microcontroller's UART pins (e.g., on an Arduino, ESP32, or Raspberry Pi). Data, such as head count and motion status, is output as structured packets according to the manufacturer's proprietary protocol, which can be parsed by your host system.

The 60GHz millimeter-wave signal can penetrate non-metallic materials like drywall, plastic, and glass, but with significant attenuation. It is primarily designed for line-of-sight or near-line-of-sight applications, such as above a doorway. Detection through solid walls is not reliable, and performance depends on the material's thickness and composition.

The sensor has a wide conical field of view of ±60° in both azimuth and pitch. This allows it to cover a broad area from a single mounting point. For optimal head counting, it should be mounted overhead (e.g., above a door), pointing downward, to ensure the detection cone covers the desired passageway or zone without obstructions.