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.
Gongma Car Tire Stone Removal Tool Set, Tire Cleaning Hook, Multi-Function Stone Picker and Extractor
$40.00
Feileniao 'Competing Beauties' Traditional Chinese Painting Gift Set - Gongbi Line Drawing DIY Kit for Beginners & New Year Gifts
$41.60
9A Natural Ice-Grade Aquamarine Loose Beads - Handmade DIY Bracelets and Necklaces for Women, Devil Blue Crystal Single Bead
$23.10
High-Precision Digital Tire Pressure Gauge with Large Display for Car Inflation
$49.50
Premium Factory Price Low-Temp 3D Printing Pen (2-Pack) - Compatible with PCL Filament
$67.91
Music Theory Book Jazz Theory Introduction Volume 1 Jazz Teaching Theoretical Knowledge Basic Textbook Tutorial HD Electronic Version
$5.00
Extra-Large Transparent Plastic Storage Box with Lid, Home Organizer for Clothes and Household Items
$4.80
Baijiali Artistic Eyebrow Hair Transplant: Bilateral Filling for Sparse Areas, Dense and Natural-Looking Results
$7,800.00
Plastic U-Shaped Trough Mold for Yam Cultivation, Directional Shallow Growth Slots (100 Pieces, Free Shipping)
$31.40
Maikeku Commercial Slow Juicer, Large Pulp-Separating Juice Extractor with High Power, Wide Mouth, Fully Automatic for Street Vending
$7,456.32
Continental CSC5 Tire 245/50R18 104V MO-V for Mercedes-Benz Viano, Vito, V260
$882.00
English Vocabulary Flashcards for Classroom Teaching - Categories Include Weather, Days, Months, Clothing, Home, Seasons, Fruits, Food, and Professions
$8.42
Cabinet Storage Box, Foldable Rattan-Style Basket for Countertop Snacks, Clothes, and Toys
$19.90
Custom PVC Sign Letters, Advertising Signs, Branding Wall Characters, Snowflake Board, Acrylic Crystal Letters for Background Walls
$5.00
Specialized Vegetable Growing Box - Foam Balcony Planter, Rectangular Plastic Pot for Home Gardening
$41.70
Fully Protected Smart Battery Tester - Performance Detector for Electric Vehicle and Car Batteries
$286.00
Large-Diameter Steel Corrugated Drainage Pipe for Bridge Culverts
$61.11
Water Curtain Paint Booth - 3-Meter Spray Station with Water Circulation for Paint Mist Purification, Eco-Friendly Dust Removal, 1-Meter Small Water Curtain Cabinet
$1,980.00
Portable Cleaning and Storage Box for Elderly Dentures, Compact Case for Full-Set False Teeth Soaking and Storage
$32.22
RC Model A07 PNP FPV Analog/Digital Racing Drone 7-Inch Aerial Photography Quadcopter Frame
$1,643.00
ACCSOON SeeMo Monitor Converter for iPhone and iPad, Real-Time Monitoring and Live Streaming
$1,059.00
Solenoid Valve Initial Inspection Test Bench / Solenoid Valve Leakage Test Bench / Solenoid Valve Airtightness Test Bench
$7,482.00
Factory Direct Hardware Screw and Parts Automatic Weighing and Packaging Machine, Vertical Weighing and Packing Equipment
$36,860.00
Commercial Heated Beverage Cabinet, Small Countertop Display Warmer with Constant Temperature for Supermarkets
$1,099.00
Manufacturer Supply Standard Dual-Color Film Copy Paper Ink Water-Based Ink Gravure Printing Machine
$17,500.00
Gray Surface Pen for Sketching and Quick Drawing - Art Highlight Sketch Paper Blending Stump and Sponge Eraser Tool Set for Still Life, Geometry, and Portraits, Designed for Art Students and Exam Candidates, Complete Beginner Kit
$6.80
Extra-Large Denture Storage Box for Seniors, Food-Grade Portable Cleaning and Soaking Container for Full Dentures
$29.90
![[Sheet Music Collection for Teachers] Continuously Updated – HD, No Watermark, Includes Tutorial Videos](https://www.gosteppe.com/cache/small/product/270366/legacy-main-31b5e0667fb30a4c5628abbc.webp)
[Sheet Music Collection for Teachers] Continuously Updated – HD, No Watermark, Includes Tutorial Videos
$49.90
Orthodontic Retainer Case for Invisible Braces, Portable Storage and Cleaning Box for Teeth Aligners and Dentures
$23.10
Portable Retainer Case for Braces, Orthodontic Clear Aligner Storage Box with Chewie and Removal Tool
$3.98
![[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)
