Hi-Link HLK-LD104 10GHz Motion Detection Radar Sensor Module

The HLK-LD104 operates on a wide DC voltage range from 3.3V to 12V. This makes it directly compatible with common 5V microcontroller platforms like Arduino Uno as well as 3.3V systems like Raspberry Pi or ESP32 without requiring a level shifter, providing significant design flexibility.

The sensing radius (3-5 meters) and trigger delay are configurable via the module's serial communication interface. You need to send specific configuration commands through a UART connection from a microcontroller or computer. The exact command protocol should be referenced from the manufacturer's datasheet or application notes.

Yes, microwave radar sensors like the HLK-LD104 can detect motion through thin, non-metallic barriers such as drywall, plastic, or glass, though with potentially reduced range. This makes it suitable for concealed installations. However, metal surfaces will block the signal completely.

The module provides a digital output via its serial (UART) port. To interface with an Arduino, connect the module's TX/RX pins to a software or hardware serial port on the Arduino, ensuring logic level compatibility (the module is 3.3V logic but is typically 5V tolerant). The Arduino can then read the digital motion status or send configuration commands.