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Hi-Link HLK-LD2410B 24GHz mmWave Radar Human Presence Sensor Bluetooth + UART

Motion Sensors
₹499.00 ₹ 422.88 + 76.12 GST
In stock
SKU
PRO5541

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QTYUnit Price(Inlc. GST)
25+ ₹489.02 ₹ 414.42 + 74.6 GST
50+ ₹484.03 ₹ 410.19 + 73.83 GST
75+ ₹474.05 ₹ 401.74 + 72.31 GST
100+ ₹469.06 ₹ 397.51 + 71.55 GST

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The HLK-LD2410B uses 24GHz mmWave radar to detect human presence, even when stationary. Features built-in Bluetooth for easy sensitivity tuning via the app. Ideal for Home Assistant & Automation.

The "Invisible" Sensor That Knows You're There Standard motion sensors have a flaw: if you sit still to read or watch TV, they think you've left and turn off the lights. The Hi-Link HLK-LD2410B 24GHz mmWave Radar Sensor changes the game. Using advanced millimetre-wave technology, it detects not just large movements (walking) but also "micro-movements" like the rise and fall of your chest while breathing. The result? A sensor that knows you are in the room, even if you are completely stationary.

Quality Advantage: Bluetooth-Enabled Tuning The "B" in LD2410B stands for Bluetooth. Unlike the standard version that requires a complex PC connection to adjust settings, the LD2410B lets you tune sensitivity, range, and delay wirelessly using the free HLKRadarTool mobile app. This is a game-changer for installation—mount the sensor on the ceiling, and then tweak the settings from your phone without climbing a ladder. Probots™ Lab Verified, this module is the easiest way to add professional-grade presence detection to your Home Assistant setup.

Key Applications & Projects

  • Automated Lighting: Create "True Presence" lighting that never turns off while you are reading or working at a desk.

  • Home Assistant Integration: Use with ESPHome (Bluetooth Proxy or UART) to trigger complex automations based on room occupancy.

  • Digital Signage: Wake up a display only when a person is actually standing in front of it, saving power.

  • Bed/Sleep Monitoring: Non-contact monitoring to detect if an elderly person has left the bed at night.

Specifications

  • Model: Hi-Link HLK-LD2410B (Bluetooth Version).

  • Frequency: 24 GHz ISM Band.

  • Modulation: FMCW (Frequency Modulated Continuous Wave).

  • Detection Distance: 0.75m to 6m (Configurable).

  • Detection Angle: ±60° Horizontal / ±60° Vertical.

  • Interfaces:

    • UART: Serial communication (Baud 256000) for data.

    • GPIO (OUT): High (3.3V) when presence detected, Low (0V) when clear.

    • Bluetooth: BLE 4.2 for App Configuration.

  • Operating Voltage: 5V DC (Accepts 5V on VCC).

  • Logic Voltage: 3.3V (UART/GPIO).

???? Unlock New Capabilities (Project Evolution)

  • Prerequisite: You should be comfortable with basic wiring (VCC/GND/OUT).

  • The Upgrade: This replaces the HC-SR501 PIR. It solves the "waving hand" problem and adds a layer of intelligence to your smart home.

  • Effort Level: Beginner to Intermediate. The Bluetooth app makes it beginner-friendly, while UART integration offers depth for experts.

Virtual Technician & Wiring Guide

  • ⚠️ Logic Level Warning: While the VCC pin accepts 5V, the RX/TX and OUT pins use 3.3V Logic. If connecting to a 5V Arduino Uno, you MUST use a logic level converter or a voltage divider on the RX line to prevent damaging the radar module.

  • Pin Mapping:

    • VCC: 5V Power.

    • GND: Ground.

    • OUT: Digital Output (Simple High/Low).

    • TX: Transmits data to microcontroller.

    • RX: Receives commands (Use 3.3V!).

  • Mounting: Do not mount behind metal. Plastic, wood, and drywall are transparent to the radar signals.

Accessories & Compatibility

  • Included: 1x HLK-LD2410B Module.

  • Recommended Hardware: ESP32 (Native 3.3V), Wemos D1 Mini, or USB-TTL Converter (for PC debug).

  • Software: "HLKRadarTool" App (Android/iOS).

Helpful Tutorials & Resources

Frequently Asked Questions (FAQ)

  • What is the difference between LD2410 and LD2410B? The "B" version has Bluetooth, allowing you to configure it wirelessly via a phone app.
  • Does it work with Home Assistant? Yes, seamlessly via ESPHome (using UART or Bluetooth Proxy).
  • Can I use it without a microcontroller? Yes, the "OUT" pin works just like a PIR sensor (High/Low) based on your configured settings.
  • How do I change the distance range? Open the HLKRadarTool app, connect via Bluetooth, and adjust the "Moving" and "Static" distance gates.
  • Does it see through walls? It can detect through thin walls/doors. You may need to reduce sensitivity to prevent false triggers from the next room.
  • Can I turn off Bluetooth? Yes, there is a secure mode to disable Bluetooth after configuration to prevent unauthorized access.
  • Is it safe? Yes, the transmission power is very low (milliwatts), safe for continuous human exposure.
  • Why is the red LED blinking? A blinking light usually indicates it is in "Configuration Mode" or detecting a target (depending on firmware version).
  • What is the baud rate? The default baud rate for UART is 256000.
  • Can I use it outdoors? It is not waterproof. If placed in a waterproof plastic box, it can work, but rain may cause false triggers.
  • Does it detect pets? Yes, it is sensitive enough to detect cats and dogs. You can try to tune the "Sensitivity Gates" to filter small movements.
  • Does it interfere with Wi-Fi? No, 24GHz is far removed from 2.4GHz/5GHz Wi-Fi frequencies.
  • Why does it say "Presence" when no one is there? Check for moving fans, curtains, or even AC airflow. Radar is extremely sensitive.
  • How fast does it respond? Detection is almost instant (<0.5s). "OFF" delay is configurable (default 5s).
  • Can I solder it directly? The module has 1.27mm pitch headers. It is hard to hand-solder; we recommend using the included cable.
  • Is it better than LD2420? LD2410B is the "General Purpose" standard. LD2420 is newer/smaller but LD2410B has wider community support currently.
  • Does it measure distance? Yes, the UART data stream provides the distance to the target in centimeters.
  • Can I hide it inside a picture frame? Yes, as long as there is no metallic paint or foil backing.
  • What power supply do I need? A stable 5V DC supply (USB or regulated source) is recommended. Noisy power can cause false triggers.
  • Is the App free? Yes, HLKRadarTool is free on Play Store and App Store.
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Nischith shetty

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Rajeev Ranjan Pandey

Worst experience. UPI payment of Rupee 1,609 was successfully debited, but the order was later cancelled and no refund was issued.

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