Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Model Number | KY-003 / A3144E |
| Operating Voltage | 4.5V to 24V DC |
| Output Type | Digital Switch (Open Collector) |
| Sensing Principle | Unipolar Hall Effect |
| Pin Configuration | 3-Pin (GND, VCC, Signal) |
| LED Indicator | Yes, Power On/Signal Status |
| Mounting Hole Diameter | 3mm |
| PCB Dimensions | 16mm x 12mm x 3mm |
| Compatible Platforms | Arduino, Raspberry Pi, ESP32 |
| Application Range | Speed Detection, Position Sensing, Proximity Switching |
Anonymous
Mar 24, 2026
Rating: 5/5
Perfect for Arduino projects
This module works flawlessly with my Arduino Uno. The detection range is consistent, and the built-in LED makes debugging very easy. Great value for the price.
Anonymous
Mar 14, 2026
Rating: 5/5
Reliable magnetic switch
Used this to create a non-contact limit switch for my 3D printer modification. It has been running for weeks without any false triggers. Highly recommended.
Anonymous
Mar 14, 2026
Rating: 5/5
Fast shipping and works great
Arrived earlier than expected. Tested immediately with a simple sketch and the output signal is crisp. No noise issues observed even with long wires.
Anonymous
Mar 10, 2026
Rating: 4/5
Solid build quality
The PCB looks clean and the soldering points are well-made. It detects standard neodymium magnets from about 1cm away, which is perfect for our conveyor belt counter.
Anonymous
Mar 10, 2026
Rating: 5/5
Great for learning electronics
Bought a pack of five for my university project. All of them worked out of the box. The voltage range is wide enough for both 5V and 12V systems.
Anonymous
Mar 06, 2026
Rating: 4/5
Good sensor, clear documentation needed
The hardware quality is solid and responds quickly to magnets. I deducted one star because the pinout wasn't clearly marked on the back, but a quick multimeter check solved it.
Q: Can I use this outdoors in the rain?
A: The PCB itself is not waterproof or conformal coated. If you plan to use it outdoors, you must enclose it in a waterproof housing or apply your own conformal coating to protect the electronics from moisture.
Q: Is this a bipolar or unipolar sensor?
A: This is a unipolar Hall effect sensor. It activates when a magnetic south pole approaches the front face of the package and deactivates when the magnet is removed. It does not require a north pole to reset.
Q: What is the maximum current this sensor can switch directly?
A: The A3144E chip itself has a limited output current capability (typically around 25mA). It is designed to drive logic inputs or small LEDs. For driving motors or relays, please use an external transistor or MOSFET.
Q: How far away can it detect a standard fridge magnet?
A: Detection distance depends on the strength of the magnet. For a standard ceramic fridge magnet, the range is typically 5mm to 10mm. Stronger neodymium magnets can be detected from 15mm to 20mm away.
Q: Does this module work with 3.3V logic levels like the ESP32?
A: Yes, the module operates between 4.5V and 24V, but the output is open-collector. You can use it with 3.3V systems by powering the module at 5V and using a pull-up resistor to 3.3V on the signal line, or simply rely on the low-state grounding which is compatible.
Universal Bamboo Joint Fume Extraction Arm Welding Smoke Exhaust Pipe Industrial Waste Gas Collection Hood Support-Free Suction Arm
$33.30
Fengzhu Wet-Dry Separation Waterproof Bag Shoulder Crossbody Pack for Outdoor Fitness Swimming Camping Electronics Storage
$109.00
Palette for Traditional Chinese Painting, Oil, Acrylic - Art Student and Kids Painting Watercolor Pigment Tray
$5.78
Huirui Polypropylene (PP) Super Glue - Fast-Setting Adhesive for Metal, Plastic, TPE, Silicone, Soft PVC, and TPU
$16.80
Bybo Dental Sweden Nobel CC Dental Implant Package Including Crown and Abutment
$6,924.00
Remote Control Negative Ion Air Purifier Home Indoor Formaldehyde Smoke Odor Haze Removal Intelligent Sterilization Disinfection Machine
$76.30
Car Tire Stone Removal Hook, Tool for Clearing Stones Stuck in Tires to Prevent Blowouts, Multi-Function Stone Extractor
$8.42
Motorcycle and E-bike Storage Hook Kit - Multi-function Hanging Hooks for Storage Boxes, Locks, and Racks
$2.01
Mojo 100% Cotton Baohong Watercolor Line Art - Beginner Watercolor, Colored Pencil & Marker Coloring Kit: Cat Letters
$32.80
![[X11] McDull Little Theater Series Plush Sticker Blind Bag, Official Authentic Trendy Collectible Hanging Ornament Toy](https://www.gosteppe.com/cache/small/product/269614/legacy-main-c0c30a047a8b8fb01f07e4d1.webp)
[X11] McDull Little Theater Series Plush Sticker Blind Bag, Official Authentic Trendy Collectible Hanging Ornament Toy
$41.60
Factory Supply Food Processing Equipment - High-Yield Fruit Pitting Machine for Commercial Berry Peeling and Mud Removal
$6,210.00
Fast Shipping Stone Removal Hook New Car Tire Stone Cleaner Tool Multi-Function Vehicle Stone Remover
$29.82
Five Elements Balance Keychain – Pixiu Charm with Natural Crystal Pendant for Wood/Fire Enhancement
$42.40
Chunfei Grocery Store: Commuter Hard Fork Low-Top Tube Mountain Bike for Urban Roads, Suburbs, School Runs, and Outings
$2,246.00
Infant Rattle Toy - Baby Soothing Shaker Drum for Newborns, Chewable and Safe for Boys and Girls
$10.90
Car Tires for Sedans and Vans, Original Equipment Sizes 165/175/185/195/205R in 14/15/16 Inches
$59.00
New Cute Tomato-Shaped Cable Organizer Clip for Charging Cords and Headphone Wires, Fabric Fixed Winding Management
$15.60
Yokohama 245/50R19 V107E 105W Original BMW iX3 EV Tire - Factory Removed
$382.00
DC Drive Equipment
$18,800.00
Meiyike Plant Slow-Release Fertilizer – All-Purpose Nutrient Pellets for Green Plants and Flowers, Household Controlled-Release Compound Fertilizer
$20.15
Pelican Air 1535 Waterproof Shockproof Lightweight Case - Photography Equipment Safe with Wheels - 1535TP Carry-On
$2,565.00
Exclusive for 618 Live Stream 20260508
$199.00
Compact Home Range Hood, Portable USB Desktop Smoke Extractor for Living Room Hot Pot and BBQ Odor Removal
$41.00
Seed Bead Tassel Song Brocade Accessories DIY Ancient Style Bracelet Bag Chest Ornament High-Quality Pendant Versatile Tassel Accessory
$2.98
Popular Pagoda-Shaped Tea Set - Chinese Style Kung Fu Tea Ceremony Set for Home, Living Room, and Office Guest Reception
$67.00
Swiss-Type Lathe External Thread Insert 60° CNC TKFT12RA60005 Stainless Steel Cutting Tool RN6001
$33.00
Dual-Tip Highlighter Set, 6 Colors, Student Marker Pens, Pastel INS-Style Colorful Emphasis Markers
$3.02
Natural 7A Moist Blue Sapphire Loose Beads for DIY Crystal Jewelry Making
$2.24
Custom Company Door Sign, Office Nameplate, Outdoor Cut-Out Enterprise Studio Logo Identifier Background Plaque
$122.20
LA・LA・LA LOVE SONG by Toshinobu Kubota - Precise Saxophone Transcription Sheet Music (3-Piece Set)
$16.00
![[Youxin Electronics] GP2Y0E03 Infrared Distance Sensor Module 4-50cm Range](https://www.gosteppe.com/cache/medium/product/74667/legacy-main-4da8cadc5fc82afe91b124e3.webp)
![[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)
