Description
Reviews
| 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 |
| Supply Voltage | 3.3V DC ±0.3V |
| Current Consumption | < 60mA (Active Mode) |
| Beam Angle | ±60° Horizontal, ±40° Vertical |
| Micro-Motion Sensitivity | Detects breathing and chest movement |
| Operating Temperature | -40°C to +85°C |
| Dimensions | 24mm x 16mm x 2.5mm |
| Protocol Support | Hi-Link Custom Protocol & Modbus |
Anonymous
Mar 27, 2026
Rating: 4/5
Good value for money
For the price point, the performance is outstanding. It handles through-plastic detection well, so I could mount it inside a junction box. Deducting one star because the default firmware settings are a bit too aggressive out of the box.
Anonymous
Mar 26, 2026
Rating: 5/5
Perfect for smart home presence detection
This sensor is incredibly sensitive. It detects my breathing even when I am sitting completely still reading a book, which solved the issue of lights turning off automatically in my office. The UART interface was easy to connect to my ESP32.
Anonymous
Mar 26, 2026
Rating: 5/5
Superior to standard PIR sensors
Unlike traditional PIR sensors that only detect gross motion, this millimeter wave radar picks up micro-movements. I used it for a bedroom automation project, and it never fails to detect occupancy. Highly recommended for advanced projects.
Anonymous
Mar 13, 2026
Rating: 5/5
Game changer for lighting control
Finally, a sensor that doesn't turn off the lights while I'm working at my desk. The micro-motion detection is the key feature here. Integration with my custom controller was straightforward using the provided protocol docs.
Anonymous
Mar 10, 2026
Rating: 4/5
Great range, needs calibration
The 8-meter range claim is accurate in open spaces. However, you need to spend time configuring the sensitivity thresholds via the serial tool to avoid false positives from ceiling fans. Once tuned, it works flawlessly.
Anonymous
Mar 06, 2026
Rating: 5/5
Reliable and compact
The form factor is tiny, making it easy to hide behind fixtures. The documentation provided by Hi-Link is decent, and the community support helps with integration into Home Assistant. No issues after 3 months of continuous operation.
Q: Can this sensor detect humans through a thin wooden door?
A: Yes, the 24GHz millimeter wave can penetrate non-metallic materials like wood, plastic, and drywall to some extent. However, detection range and sensitivity will be reduced depending on the thickness and density of the material.
Q: Does this module come with an antenna included?
A: Yes, the module comes with a built-in PCB antenna. You do not need to purchase or attach an external antenna for standard operation.
Q: Is there a Python library available for parsing the UART data?
A: Hi-Link does not provide an official Python library, but the communication protocol is documented in the datasheet. Many users have created open-source parsers for Python and Node-RED which you can find on GitHub.
Q: Can I adjust the detection distance via software?
A: Absolutely. You can configure the maximum detection range, sensitivity levels, and blanking areas using the Hi-Link debugging tool over the UART interface to suit your specific environment.
Q: What is the maximum number of targets this module can track simultaneously?
A: The LD2420 is primarily designed for single-target presence detection and micro-motion sensing. While it can filter out clutter, it is optimized for determining if a specific zone is occupied rather than multi-target tracking.
Natural Crystal Raw Stone Aroma Diffuser Ornament Rose Quartz Crushed Stone Rough Ore Home Flameless Aromatherapy Healing Gift
$3.90
Blue Scale Line Printing Machine Pad with Ruler Markings for Water-Based Ink Printing
$80.00
Sponge Drain Rack for Kitchen Countertop - No-Drill Sink Organizer for Cloths and Narrow Edge Faucet Storage
$5.80
Kids' Art Round Sponge Stamp Brush for Kindergarten DIY Crafts, Mushroom Head Painting Tool
$3.59
Caiyan Art Blending Stumps for Oil Pastels and Sketching – Washable EVA Tips for Smooth Color Transition; Non-Staining, Ideal for Art Students
$6.50
Paper Blending Stump Set for Sketching, Oil Pastels, and Highlighting – Ultra Soft
$3.83
Tire Stone Removal Hook with Built-in Screwdriver - Multi-Function Tool for Tire Cleaning, Window Breaking, and Self-Defense
$8.90
Blower Motor Compatible with Hummer H3, Hummer H2, and Cadillac Escalade
$340.00
Custom Fertilizer Integration Machine for Agriculture and Landscaping - Smart Quantitative Mobile Filtration System
$1,960.00
High-Speed Cell Sieve with Handle - Stainless Steel Laboratory Sieves (100, 200, 300, 400, 600 Mesh)
$61.74
Stainless Steel Food Warmer for Hotels and Breakfast Buffets - Commercial Flip-Top Chafing Dish with Insulation; Compatible with Induction Cookers
$1,288.00
Marie's Blending Stumps Set for Sketching and Shading, Professional Art Supplies for Students
$2.55
National Standard JB/ZQ4606-86 Felt Oil Seal Ring - Bearing Oil Absorption, Dustproof, Industrial Wool Felt Gasket Strip
$0.50
Qingzhu Sketching Eraser Knife and Paper Stump Tool Set for Art Students - Includes Replacement Tips, Gray Surface Pens, Makeup Sponge Blenders, Cotton Swabs, Foam Balls, Soft Blending Pens, Precision Insert Knives, and Sketch Eraser Balls
$7.20
4-Leg Chain Rigging Set - Alloy Steel Lifting Tool (1-200 Tons) with Multi-Leg Electromagnetic Chuck
$52.50
Commercial 1.8/2.2m Food Warmer Cabinet for Fried Chicken and Burger Shops, French Fry Heating Unit, 1.5m Two-Way Pickup Display Case
$3,573.50
Commercial Electric Heated Stainless Steel Fast Food Serving Counter Soup Warmer Buffet Cart
$842.00
Natural Crystal White Azeztulite Loose Beads with Rainbow Luster for DIY Necklaces, Bracelets, and Jewelry Making
$5.54
Ai Zao Fang Six-Cavity Oval Totem Handmade Soap Silicone Mold - Yields Approx. 115g per Bar
$17.70
Zunjue Wire-Bound 8K Watercolor Notebook 300g Watercolor Sketchbook Loose-Leaf Portable 16K Water-Soluble Colored Pencil Notebook Coil-Bound 32K Medium Coarse Fine Grain 200g Kids Students A4 Watercolor Notebook Plein Air Sketch Drawing Book
$7.65
Yuan Dynasty Calligraphy by Zhao Mengfu - Small Regular Script Diamond Sutra Brush Tracing Long Scroll Copybook, Original Version, Wholesale and Customization Available
$15.00
Kodak Photo Printing Service - High-Definition Prints from Your Phone with Lamination and Album Binding
$12.47
Shenzhen Custom Storefront Signage and Lightbox Installation - Illuminated Letters and Shop Plaques
$50.00
Automotive AC Refrigerant Gauge Set – R134a Pressure Meter with Dual Valve Tool for Home R22/R410 Air Conditioning Systems
$329.00
Complete Collection of Taoist Talisman Art Copybooks - Zhengyi Thirty-Six Generals, Calligraphy Practice Sheets with Stroke Order and Red Tracing, Classic Taoist Calligraphy
$38.00
Marie's Blending Knife Replacement Head Set Sketch Blending Tools Sponge Stumps Paper Stumps for Art Students
$4.25
French Imported Arches Watercolor Paper - Handmade 100% Cotton, 300g-850g, Medium/Rough Grain, Extra-Large Rolls and Sheets (4K, Full, Half, Quarter)
$33.10
Commercial Countertop Food Warmer Display Case - For Fried Chicken, Burgers, Egg Tarts, Pies, Youtiao, and Shaobing
$720.00
Integrated Hospital Wastewater Treatment Unit Underground Integrated Sanitary System Sewage Discharge Unit Eco-Friendly Wastewater
$10,000.00
Double Loop Lifting Chain with Rebar Bottom Hook - Manganese Steel Sling for Heavy Duty Rigging
$29.00
![[Trial Pack] Xianlang Complete Cat Treat Sticks Meal Packs Main Course Cans Freeze-Dried Cat Food Sample Snacks Gift Set](https://www.gosteppe.com/cache/medium/product/208273/legacy-main-9ec245ebf781f65a434ba854.webp)
