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Hi-Link HLK-LD2410C

₦ 15,000

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Product details

The Hi-Link HLK-LD2410C is a high-sensitivity, 24GHz millimeter-wave (mmWave) human presence radar sensor module. Unlike standard Passive Infrared (PIR) motion sensors that require a person to move to trigger them, the HLK-LD2410C can detect both moving and completely stationary individuals (such as someone sitting still, sleeping, or breathing softly). [1, 2, 3]

Technical Specifications

Operating Frequency: 24 GHz to 24.25 GHz (ISM Band)
Technology: Frequency Modulated Continuous Wave (FMCW) radar
Sensing Range: 0.75 meters up to 5–6 meters (configurable)
Detection Angle: ±60° (120° total horizontal beamwidth)
Power Supply: 5V default input (supports 5V–12V with ~79mA average current consumption)
Logic Level: 3.3V UART (Transmit/Receive communication pins)
Default Baud Rate: 256,000 bps (256K)
Form Factor: Compact square layout, measuring roughly 16mm x 22mm

Gating and Distance Zones

The sensor’s detection range is uniquely divided into 9 range gates spaced exactly 0.75 meters apart. This granular design allows you to:

Set unique motion and static sensitivity thresholds for each zone.
Exclude specific zones to eliminate false positives (e.g., ignoring a rotating ceiling fan or curtains moving near a window in Gate 4).
Define different maximum ranges for moving targets versus stationary targets.

Pinout Configuration

The module features a standard 5-pin layout with a 2.54mm pitch spacing:

VCC: 5V Power Input.
GND: Power Ground.
OUT: Digital Output pin. Outputs a high level (3.3V) when human presence is detected and a low level (0V) when empty.
UART_Tx: Serial data transmission pin (outputs radar tracking data).
UART_Rx: Serial data reception pin (receives configuration parameters).

Specifications

Key Features

Connectivity and Upgrades (vs. Base Models)

The "C" in HLK-LD2410C denotes its Bluetooth Low Energy (BLE) capability. While earlier base models like the LD2410 only used wired serial connections, the "C" variant allows you to wirelessly configure, tune, and read data over Bluetooth.

Configuration & Integration Tools

You can tune the sensitivity and latency of your sensor using three main methods:

HLKRadarTool (Mobile App): Available on Android and iOS. Connects wirelessly via Bluetooth and is the only tool that lets you change the default 256K baud rate to a lower rate (like 115,200) to match slower microcontrollers. [1]
Web & PC Utilities: The desktop application (LD2410-Tool) or Web Serial browsers (like Chrome or Edge visiting specialized configurator pages) let you visually map target distances with real-time graphs when using a USB-to-TTL serial adapter. [1, 2]
Smart Home Integrations: It is natively supported by ESPHome and Home Assistant. You can wire it directly to an ESP32 microchip to track real-time occupancy coordinates or pair it wirelessly as a Bluetooth tracking entity. Note: The sensor can only handle one Bluetooth connection at a time; disconnect it from Home Assistant if you need to use the mobile app.