This sensor serves as a replacement for a PIR sensor and works on the basis of microwaves and the doppler effect. Due to a difference in speed, this sensor can detect motion, this also works through almost all materials except metal. The sensor status can be read via the UART interface or via Bluetooth to read out more information such as detection distance.

The sensor can be used in different ways:

• You can use the sensor with ESPHome via the following library: ESPHome Hi-Link HKL-LD2450
• You can configure and update this sensor via the HLKRadarTool app on Android/iOS.
• You can read the sensor with a microcontroller such as an Arduino via the following library: arduino-lib_HLK-LD2450_Radar

See the following page for more information: Drive

Check the tab "Downloads" for more information and/or downloads.

Key Features

• Frequency: 24 GHz ISM band (24–24.25 GHz), using FMCW modulation and 250 MHz sweep bandwidth. :contentReference[oaicite:0]{index=0}
• Ultra-compact size: 15 × 44 mm. :contentReference[oaicite:1]{index=1}
• Detection range up to 6 m (wall-mounted). :contentReference[oaicite:2]{index=2}
• Wide coverage: ±60° azimuth, ±35° elevation. :contentReference[oaicite:3]{index=3}
• Captures micro-movements; unaffected by environment (light, temperature, humidity). :contentReference[oaicite:4]{index=4}
• Penetrates non-metal enclosures—no surface openings required. :contentReference[oaicite:5]{index=5}

Applications

• Presence-aware control of lighting, HVAC, and appliances.
• Smart toilets with automatic lid control.
• Doorway detection or proximity-based interactions in offices and public spaces. :contentReference[oaicite:6]{index=6}

Technical Specifications

• Power: 5 V DC input; >200 mA current. :contentReference[oaicite:7]{index=7}
• Interfaces: UART serial output, default baud rate 256,000; 1 stop bit, no parity. :contentReference[oaicite:8]{index=8}
• Data Rate: 10 Hz (10 frames per second). :contentReference[oaicite:9]{index=9}
• Operating Temp: –40 °C to +85 °C. :contentReference[oaicite:10]{index=10}
• Dimensions: 15 mm × 44 mm. :contentReference[oaicite:11]{index=11}

Installation & Usage

• Supports wall-mount setup at 1.5–2 m height for optimal coverage. :contentReference[oaicite:12]{index=12}
• Ensure antenna faces the detection zone, without obstructions or strong reflections. Avoid interference from fans, HVAC outlets, or swinging objects. :contentReference[oaicite:13]{index=13}
• Install in non-metal enclosures or apply appropriate radio-transparent radome materials. :contentReference[oaicite:14]{index=14}

Setup & Data Integration

• Comprehensive instruction manual included—for wiring, dimension specs, communication protocol, and performance data. :contentReference[oaicite:15]{index=15}
• Compatible with ESPHome and Home Assistant via ESPHome component or external library. Requires firmware V2.02.23090617+ and proper UART configuration. :contentReference[oaicite:16]{index=16}
• Community projects (e.g., Hackster.io) demonstrate practical use—for tracking individuals in zones, applying custom coordinate transformations, or building enclosure housings. :contentReference[oaicite:17]{index=17}

Why Choose HLK-LD2450?