Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Operating Frequency	24 GHz ISM Band
Detection Range	0.5m to 8m (Adjustable)
Communication Interface	UART (TTL Level)
Supply Voltage	3.3V DC ±5%
Current Consumption	< 60mA (Active Mode)
Beam Angle	±45° Horizontal, ±30° Vertical
Output Protocol	Modbus / Custom UART
Operating Temperature	-40°C to +85°C
Module Dimensions	26mm x 18mm x 2.5mm
Application Scenario	Smart Lighting, Security Systems, HVAC Control

6 reviews

Anonymous

Mar 28, 2026

Rating: 5/5

Reliable for occupancy counting

We are testing these for a small meeting room counter. The ability to distinguish between static presence and motion is a game changer. The data output is consistent and easy to integrate into our MQTT bridge.

Anonymous

Mar 23, 2026

Rating: 4/5

Good value but requires 3.3V logic

Works great, but remember this is a 3.3V device. I accidentally connected it to 5V initially and had to be careful. Make sure your microcontroller logic levels match or use a converter. Performance is solid after fixing that.

Anonymous

Mar 20, 2026

Rating: 5/5

Perfect replacement for PIR

Finally, a sensor that knows when someone is actually sitting still in the room. I used this to control my office lights, and they no longer turn off while I'm reading. The documentation provided by Hi-Link was helpful.

Anonymous

Mar 14, 2026

Rating: 5/5

Excellent sensitivity for smart home projects

This LD2412 module works flawlessly with my ESP32 setup. It detects even slight movements like typing on a keyboard, which older PIR sensors missed completely. The UART communication is straightforward to parse.

Anonymous

Mar 14, 2026

Rating: 5/5

Compact and powerful

Small form factor makes it easy to hide behind diffusers or in junction boxes. The 24GHz frequency penetrates thin plastic covers without issues. Highly recommended for commercial presence detection prototypes.

Anonymous

Mar 08, 2026

Rating: 4/5

Great range, needs calibration

The detection range is impressive up to 6 meters in my hallway. However, you need to spend time tuning the sensitivity gates via the serial command to avoid false positives from ceiling fans. Once configured, it's very reliable.

5 FAQ

Q: Can this sensor detect people through a thin wooden door?

A: While millimeter wave radar can penetrate some non-metallic materials, detection through wood depends heavily on thickness and density. For the LD2412, we recommend line-of-sight installation or mounting behind thin plastic covers for optimal performance. Thick wood may significantly attenuate the signal.

Q: Is there a Python library available to parse the UART output?

A: Hi-Link does not provide an official Python library, but the protocol is well-documented in the datasheet. Many users have created open-source parsers available on GitHub for ESPHome and Home Assistant which work perfectly with this module.

Q: What is the maximum number of targets this sensor can track simultaneously?

A: The LD2412 is primarily designed for presence detection rather than multi-target tracking. It reliably detects the presence of one or more humans within the zone but does not provide distinct coordinates for multiple separate individuals like higher-end imaging radars.

Q: Does this module come with an antenna included?

A: Yes, the LD2412 module comes with integrated PCB antennas. You do not need to purchase or solder external antennas for standard operation. Just ensure there is no metal obstruction directly in front of the antenna area.

Q: How do I reset the configuration if I mess up the sensitivity settings?

A: You can restore factory defaults by sending the specific 'restore default' command via the UART interface as detailed in section 4.2 of the user manual. Alternatively, cycling the power while holding the configuration pin (if accessible on your specific breakout) may also reset it.

Explore your interests

STC32G12K128 STC8H8K64U Microcontroller Small System Core Board Development Board Emulator

$16.50

Youxin Electronics_STM32H743IIT6 Core Board System Board Learning Board STM32 Development Board

$118.00

Arduino DUE Development Board 32-bit ARM Controller A000062 Italian Official Original Import with Cable

$299.00

Ultrasonic Sensor HC-SR04 Ultrasonic Distance Measuring Module Bracket US015-025-026-100

$3.16

Serial SHT20 Chip Temperature and Humidity Sensor Test, SHT30 Chip Measurement and Monitoring Module by Viter Intelligence

$11.00

High-Speed Yabo Smart Raspberry Pi 4B Motherboard Development Board Accessories RaspberryPi 2G/4G/8G RAM Py

$494.30

Magnetic Circular Counting Chips, Two-Sided Flip Coins for Elementary Math, Kindergarten Early Education, Ten-Frame Matrix, Addition/Subtraction within 10 & 20, Teaching Tools

$11.90

3-Wire/4-Wire Flame Sensor Module, Fire Source Detection with IR Receiver, Flame Detection and Alarm

$1.08

SANSI White Label Class A Glass Graduated Cylinder C18 Micro-Precision Demulsification Cylinder with Scale Measurement Includes Certificate Ground Joint Stopper Hexagonal Bottom Borosilicate Glass Lab Equipment

$3.68

EV2400 Battery Unlock Fuel Gauge Programmer MSP430 HPA500 Evaluation Module Interface Board SMBus

$323.00

Cube Three-View Teaching Aid with Grid - 3D Geometry Observation Tool for Grades 4-5 Math (2cm Cubic Blocks Set)

$15.10

OrangePi Orange Pi Zero3 Zero 3 Development Board Allwinner H618 Orange Pi

$228.00

Digital 38KHz Infrared Receiver Transmitter Head Sensor Module Electronic Building Blocks Robot Infrared Communication Remote Control

$2.29

12V Stable Version Light-Control Switch No-Light Sensing with Extension Cable Photoresistor Plus Relay Module

$49.20

STM32 Smart Car 51 Microcontroller Arduino Obstacle Avoidance Chassis Kit Mecanum Wheel Robot Car

$40.80

Tech Small Production Small Invention DIY Piano Electronic Keyboard Real Playable Science Small Handmade DIY Materials

$33.00

HX711 Pressure Sensor Module Electronic Scale Bracket Weighing DIY Scale Pan Tray Set 5/10/40kg200

$3.28

Transparent 3D Geometric Model Perspective Decomposition Graphic Teaching Aid, Complete Set for Elementary Grades 1-6 Math

$6.80

Thin Film Pressure Sensor Display, USB Rechargeable Flexible Resistive Pressure Digital Display Module, Wide Range Wireless

$20.00

E18-D80NK Infrared Photoelectric Switch Diffuse Reflection Obstacle Avoidance Sensor Module 3-80CM

$12.60

LAN8720 Module Network Module Ethernet Transceiver RMII Interface Development Board Xinwei Electronics

$7.85

STC15W408AS Core Board Minimum System Board 51 Microcontroller Development Board TTSOP20 Learning Board

$18.47

New Version MEGA2560 R3 Development Board, Improved MEGA2560 R3 with Sensor Expansion Board

$13.68

Gradient Visual Illusion Kit: Electric Rotating Assembly Toy for Maker DIY, Paintable Handmade Model

$8.72

51/AVR Microcontroller Core Development Board STC89C52RC/51MCU Experiment Board/ATMEGA32 Learning Board

$37.90

[Trial Pack] Xianlang Complete Cat Treat Sticks Meal Packs Main Course Cans Freeze-Dried Cat Food Sample Snacks Gift Set

$15.00

5A Range Current Transformer Module Voltage Sensor Single-Phase AC Active Output Current Transmitter

$5.06

Foldable Clothes Drying Rack Floor Standing Home Balcony Bedroom Hanging Clothes Quilt Drying Artifact Outdoor Cooling Rod Indoor Drying Rack

$47.10

Metal Detector Module Non-Contact Metal Induction Sensor Detection Module Metal Detector

$8.70

RV1103 Miniature Linux Development Board: RISC-V Vision and AI with Ethernet Port

$53.10

For Arduino Development Board R3 Mainboard Microcontroller Module Kit Programming Learning Board Sensor Suite

$78.00

Xuefen Geometry Stamping and Tracing Set for Grades 1-2, 3D and 2D Ink Pads, Math Learning Tools, Cube and Cuboid Models

$4.51

Rubber Tire Toy 4WD Smart Car Wheels Car Model Robot Accessories (Suitable for 2mm Axle)

$0.50

E18-D80NK Infrared Obstacle Avoidance Sensor Proximity Switch Smart Robot Car 10-80cm

$6.30

Digital 38KHz Infrared Receiver/Transmitter Head Sensor Module for Electronic Building Blocks Robots, Infrared Communication Remote Control

$2.80

51 MCU Minimum System STC89C52 DIP40 Through-Hole Smart Car Main Control Board Learning Experiment

$19.80

Outdoor Adventure Kids' Insect Observation Box with Magnifying Glass, Boys & Girls Toy for Exploration, Butterfly Catching and Fish Scooping Tools

$7.80

MPU-9255 9-Axis Attitude 3-Axis Electronic Compass Accelerometer Gyroscope Magnetic Field Sensor Module

$13.42

Freeze-Dried Chicken Treats for Dogs: Nutritious Weight-Gain Breast Meat Chunks for Puppies – Teeth Cleaning, Grain Mixing, Universal Use

$3.90

Ningbo Keli SQB Cantilever Beam Weighing Module Sensor 100kg 500kg 1t 2t 3 Ton Small Floor Scale Inductor

$48.00