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 / Bluetooth 5.0 BLE |
| Supply Voltage | 3.3V DC ±5% |
| Current Consumption | < 15mA (Active Mode) |
| Beam Angle | ±45° Horizontal, ±30° Vertical |
| Microcontroller | Integrated High-Performance MCU |
| Operating Temperature | -40°C to +85°C |
| Dimensions | 26mm x 20mm x 2.5mm |
| Application Scenario | Smart Lighting, HVAC Control, Security Systems |
Anonymous
Mar 30, 2026
Rating: 5/5
Reliable presence detection
Unlike standard PIR sensors, this millimeter-wave radar detects stationary humans effectively. I used it to control my office AC, and it no longer turns off while I'm sitting still at my desk. Highly recommended.
Anonymous
Mar 24, 2026
Rating: 5/5
Best in class for 24GHz
I have tested several modules in this category, and the LD2401 offers the best balance of performance and ease of use. The multi-target detection capability is impressive for such a compact module.
Anonymous
Mar 20, 2026
Rating: 5/5
Easy integration with ESP32
Connected this directly to an ESP32 using the TX/RX pins. The protocol is straightforward, and the data output is consistent. The ability to update firmware over Bluetooth is a nice bonus feature.
Anonymous
Mar 15, 2026
Rating: 4/5
Compact and powerful
Very small footprint which fits perfectly inside my custom switch boxes. Detection range is accurate as advertised. Only giving 4 stars because the antenna orientation matters quite a bit for optimal performance.
Anonymous
Mar 11, 2026
Rating: 4/5
Great value but needs careful calibration
The hardware quality is solid for the price. Initially, it had some false positives near a vibrating fan, but after tweaking the sensitivity parameters via UART, it works flawlessly. Documentation could be slightly more detailed.
Anonymous
Mar 02, 2026
Rating: 5/5
Perfect for Smart Home Automation
This sensor is incredibly sensitive and accurately detects even subtle movements like breathing. The Bluetooth configuration app made setting up detection zones a breeze. Integrated it into my living room lighting system successfully.
Q: Does this module come with a casing or is it just the bare PCB?
A: This product is sold as a bare PCB module intended for integration into other devices or enclosures. It does not include a plastic housing, but the pin headers are pre-soldered for easy prototyping.
Q: Is there a Python library available for parsing the UART data?
A: Yes, the community has developed several open-source Python libraries for parsing LD2401 data streams. You can find them on GitHub by searching for 'LD2401 Python'. We also provide a basic protocol document in the download section.
Q: Can this sensor detect people through a thin wooden door?
A: While millimeter-wave radar can penetrate non-metallic materials to some extent, performance depends on material thickness and density. For reliable operation, we recommend line-of-sight installation or mounting where the signal does not need to pass through solid obstacles.
Q: What is the maximum number of targets this module can track simultaneously?
A: The LD2401 can typically distinguish and track up to 3 separate moving targets within its field of view, depending on their separation distance and the configured sensitivity settings.
Q: Can I power this directly from a 5V Arduino pin?
A: No, the module operates at 3.3V. Connecting it directly to a 5V source may damage the sensor. Please use a 3.3V regulator or a logic level converter if your microcontroller operates at 5V.
Japanese High-Concentration Oxalic Acid Toilet Cleaner, Powerful Urine Scale Remover and Stain Eliminator
$23.82
Biliansheng No-Shave Hair Transplant - Hairline and Crown Thinning Treatment, Hair Loss Detection Service
$86.00
Laorentou Paper Blending Stump for Sketching - Professional Art Supply for Highlighting and Pastel Work
$6.80
Fast-Drying Glue for ABS Plastic - Transparent, High-Strength, Odorless, Non-Whitening Instant Adhesive for ABS and PC Plastics
$58.96
Manufacturer Supply Oxygen Absorber Oxygen Generator Stable Performance Hydrogen-Rich Machine Hydrogen Generator
$5,058.00
POPMART CRYBABY Vacation Mode On - Vinyl Plush Keychain Blind Box
$106.99
Portable Travel Potty for Kids, Outdoor Toilet, Foldable Car Seat Potty for Babies, Travel Urinal for Outdoors
$29.90
Wen Zhengming Red Cliff & Tengwang Pavilion Copybook - 2-Volume Running Script Long Scroll for Calligraphy Practice
$22.00
Commercial Food Warmer Cabinet, Double-Layer Display Unit for Western Restaurants and Burger Shops, Wholesale Two-Tier Heating Showcase
$2,527.00
Electromagnetic Pulse Valve Blow-Type Submerged Right-Angle Explosion-Proof Solenoid Valve
$152.00
Pure Brass Backflow Incense Holder with Wooden Base, Incense Burner Stand for Sandalwood
$4.17
Multi-Function Over-Toilet Freestanding Shelf - Bathroom Storage Rack for Sink Area and Behind-Toilet Space
$958.10
Catalytic Combustion Equipment RCO Activated Carbon Adsorption Desorption Integrated Machine Industrial Plastic Waste Gas Purification Treatment Device
$4,400.00
RoHS Ten Hazardous Substance Alloy Analysis and Coating Thickness Gauge - EDXRF Environmental Testing Instrument
$10,856.00
Outes Air Energy Water Heater for Home Heating, Inverter Floor Heating & Central AC All-in-One Unit
$18,000.00
2025 Limited Edition Colorful Mesh Tofu Bag - Ultra-Light Breathable Multi-Purpose Storage Pouch
$11.90
Liupintang Calligraphy Felt Mat – Traditional Chinese Style Cultural Creative Painted Desk Pad for Brush Writing, Practice, and Ink Painting
$19.30
Shengneng Commercial Air Source Heat Pump Host KFXRS-40Ⅱ
$45,000.00
Yiyi Electric Pad Printing Ink Cups (150/175/300/380) - Magnetic Doctor Blade Ink Wells for Coding Machines
$68.00
ML-150 Standard Material Leveling Machine - Economical and Practical Model
$11,780.00
3-in-1 Multi-Function Paint Brush Washer with Palette Compartments for Art Students
$5.02
Silicone Dental Retainer Case - Portable Storage Box for Orthodontic Aligners & Dentures
$19.30
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
![[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)
