Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Model Number | S21C |
| Operating Voltage | DC 3.3V - 5V |
| Detection Range | 2cm to 400cm |
| Accuracy | ±3mm |
| Beam Angle | 15 degrees |
| Protection Rating | IP67 Waterproof |
| Interface Type | UART / TTL |
| Operating Temperature | -20°C to +70°C |
| Dimensions | 45mm x 20mm x 15mm |
| Application | Robot Obstacle Avoidance |
Anonymous
Mar 21, 2026
Rating: 5/5
Beginner friendly
As someone new to sensors, I found this very easy to set up. The voltage range is flexible, and it worked immediately with my 5V power supply. Great product!
Anonymous
Mar 21, 2026
Rating: 5/5
Reliable in various conditions
I tested this in light rain and dusty environments thanks to the IP67 rating. It maintained high precision throughout. Best ultrasonic module I have purchased this year.
Anonymous
Mar 13, 2026
Rating: 5/5
Excellent value for money
Compared to other high-precision sensors on the market, this S21C offers unbeatable value. The build quality is solid, and the ranging consistency is impressive.
Anonymous
Mar 11, 2026
Rating: 5/5
Perfect for my robotics project
This sensor is incredibly accurate. I used it for a line-following robot with obstacle avoidance, and the response time is instant. The waterproof coating gives me peace of mind for outdoor tests.
Anonymous
Mar 07, 2026
Rating: 4/5
Great precision, easy to integrate
Works flawlessly with Arduino and Raspberry Pi. The documentation could be slightly better, but once connected, the data stream is very stable. Highly recommend for hobbyists.
Anonymous
Mar 07, 2026
Rating: 4/5
Solid performance for smart cars
Using this for an automatic induction car prototype. It detects obstacles smoothly without false positives. Only minor issue is the cable length, which I had to extend myself.
Q: Is this compatible with Arduino Uno?
A: Yes, the S21C module operates on 3.3V to 5V and uses a standard UART interface, making it fully compatible with Arduino Uno and most microcontrollers.
Q: Does it come with mounting brackets?
A: The package includes the sensor module and connecting wires. Mounting brackets are not included, but the module has two standard 3mm mounting holes for easy customization.
Q: Can this sensor detect glass obstacles?
A: Ultrasonic sensors can sometimes struggle with smooth glass surfaces as sound waves may pass through or reflect at odd angles. We recommend testing your specific use case, but adding a textured surface to the glass helps.
Q: What is the maximum update rate?
A: The module supports an update rate of up to 50Hz, allowing for real-time obstacle detection in fast-moving applications like smart cars.
Q: How deep can it be submerged?
A: With an IP67 rating, the sensor can withstand temporary immersion in water up to 1 meter for 30 minutes. It is designed for splash resistance and brief submersion, not continuous underwater operation.
UHT Ultra-High Temperature Sterilizer, Room-Temperature Set Yogurt Production Line, Yogurt Processing Equipment, Stirred Yogurt System
$80,640.00
Professional Sketch Blending Kit for Art Students: Gray Tone Pencils, Sponges, Stumps, and Erasers
$4.17
Custom Solid Wood Signboard with Engraved Lettering, Advertising Carved Plaque for Homestays, Tea Rooms, Studios, Wooden Entrance Hanging Sign
$16.90
MOKO Stainless Steel Expandable Dish Drainer - Multi-Function Kitchen Sink Rack for Bowl and Plate Storage
$28.00
WoSporT Factory Direct WST Safety Case 32cm (12.6 inch) - Dustproof, Waterproof, and Impact-Resistant Tool Box
$95.00
South Korea DIO Dental Implant / Implant + Abutment + Crown
$1,580.00
40cm Extended Drill Attachment with Scouring Pad Head for Polishing, Rust Removal, and Marble Countertop Cleaning
$60.00
Authentic Ou Style Tian Kaishu Thousand Character Classic Calligraphy Card for Adult Practice, High-Definition Coated Paper
$55.10
Zer0g Ultra-Light 14g Backpack Waterproof Liner - Polycro Odor-Barrier Pack Liner for Hiking and Trekking
$21.20
Touchmark Liquid Acrylic Markers with Soft Tips, Specialized for Elementary School Art, Ideal Birthday Gift for Children
$18.90
Paper Blending Stump for Sketching - Professional Art Tool with Blade for Highlights, Pastels, and Oil Pastels
$3.74
Wen Zhengming Small Regular Script Love Lotus Essay Brush Tracing Practice Copybook Calligraphy Paper Copying Custom Wholesale for Beginners
$8.80
Heavy-duty Industrial Scouring Pad Roll with Aluminum Oxide for Stainless Steel Polishing and Rust Removal
$57.52
1.06m Leather Slitting Machine – Wide-Range Strip Cutter for Leather, Luggage, and Rubber Materials
$16,250.00
Ceramic Double-Boiler Steaming Bowl with Lid – Ideal for Eggs, Bird's Nest, Custard, and Soup for Home or Commercial Use
$21.11
![[Ya Que You Sheng] DT900 PRO X Calibration File V2 Version EQ Equalization](https://www.gosteppe.com/cache/small/product/269040/legacy-main-a3c0c55ffaafe89c05afced1.webp)
[Ya Que You Sheng] DT900 PRO X Calibration File V2 Version EQ Equalization
$15.00
Ceramic Rabbit Egg Holder, Creative Irregular Egg Stand, Home Breakfast Small Dish, Craft Gift Ornament
$44.78
Hot-Selling Wire Money Tree Bonsai Base – Ceramic Pot for Wealth Attraction Incense
$37.00
Maike Outdoor Sports Waterproof Backpack Wet-Dry Separation Ski Bag Fishing Creek Fins Multi-Function Gear Storage
$152.00
Viral NFC Chip Stickers for Music Wall - Adhesive Read/Write Tags for Song Scanning, Cards, and Photo Frames
$2.38
Rechargeable Generation 2 Personal Air Purifier - Safe Portable Electric Fan for Travel Commuting and Flights
$181.00
Integrated Sink Splash Guard with Silicone Drain Mat - Auto-Draining Countertop Organizer
$23.30
Ultra-Light Aluminum Camping Light Pole – Foldable Mini Lamp Stand for Outdoor Picnics and Tabletop Use
$8.33
bimoz Under-Desk Cable Organizer No-Drill Shelf for Home Office Socket Strip Router Wire Data Cable Fixer Minimalist Wire Winder Dual-Side Mount Ventilated Design
$40.80
Extended Deep-Cut External Thread Tool Holder with Relief Groove for Swiss-Type Lathe HKFF42R6001
$15.50
Meiao Dental Imported Dental Implant Package, Swiss ITI Straumann Implant Abutment, False Teeth, Filling, and Planting
$14,188.00
Assorted Colors Kids' Painting Crayons - Washable Oil Pastels in 12, 18, 24, or 36 Colors for Graffiti and Coloring
$2.47
Fruit and Vegetable Slicer - Stainless Steel Commercial Electric Multi-Function Shredder for Radish, Potato, Cucumber, Pepper, Automatic
$2,880.00
CAAS-Developed Granular Insecticide and Fungicide for Vegetable Gardens – Soil Pest Control and Fertilizer for Enhanced Vegetable Growth and Yield
$13.50
Marie's C6823 Sketch Blending Stumps (3-Pack), Professional Charcoal and Pastel Smudging Tools for Art Students and Beginners, Hard/Small/Highlight Set on Newsprint
$7.48
![[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)
