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Welcome to Vol. 12 of The Probots Showdown. Three boards. Three price points. Three very different futures for your project.Should you stick with the
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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)


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Probots sells every Electronics Part for your next Project. You can order 10,000+ Electronic Parts Online - Arduino, Raspberry Pi, NodeMCU Development Boards, Sensors, Motors, Motor Drivers, SMPS, Plastic Enclosures etc in India directly on probots.co.in
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