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.
Iers Electric Airbrush/Marker Pen Wireless Handheld Portable for Gundam Model Painting
$322.00
Commercial Glass Food Warmer Display Case for Egg Tarts, Hamburgers, Fried Chicken, and Youtiao - Countertop Heating Cabinet for Catering
$1,795.00
Premium Used Tires Removed from Vehicles Sizes 155 165 175 185 195 205 215 225
$54.00
Storage Bag Compatible with Dyson/Laifen Hair Dryer Curling Iron Straightener Double-Layer Portable Travel Hand-Carry Case
$48.40
Chushinmi - Silicone Collapsible Dish Drying Rack, Kitchen Organizer, Sink Utensil Holder for Bowls and Chopsticks
$61.90
Wenxin Tang Ultra-Clear Zhi Yong Thousand Character Classic Regular Script Calligraphy Cards - Boxed Practice Sheets for Medium-Sized Brush Writing
$40.80
Cute Pig Pot Lid Holder and Drainage Mat, Multi-Function Heat Insulator and Cutting Board Rest
$2.01
![[Damai Micro-Needle Hair Transplant Patent] Top Scalp Thinning Treatment | High-Density 200 Grafts Micro-Needle Transplant](https://www.gosteppe.com/cache/small/product/269847/legacy-main-921c5365abd34b2597668ec5.webp)
[Damai Micro-Needle Hair Transplant Patent] Top Scalp Thinning Treatment | High-Density 200 Grafts Micro-Needle Transplant
$199.00
Song Dynasty Guo Xi's 'Traveling in Snowy Mountains' Hanging Scroll - Study Copy Template, Art Core, Landscape Painting, Zen Decorative Art, HD Collectible
$12.80
Drain Basket for Wet/Dry Separation with Hanging Vegetable Strainer Rack
$111,978.00
Custom Mesh Lid Organizer Bag for Pelican 1535 Case - Laptop Compartment
$118.70
Home LED High-Power Rechargeable Flashlight, Multi-Purpose Long-Range Portable Ultra-Bright Mini Torch
$20.60
Accsoon CineEye M7 Pro 4K Wireless Video Transmitter and Monitor with 7-inch HDMI/SDI Dual-Transmission Screen
$99.00
Stainless Steel Sink Rack Kitchen Organizer Over-Sink Dish Drying Rack with Utensil Holder
$48.00
Specialized Vegetable Growing Box - Foam Balcony Planter, Rectangular Plastic Pot for Home Gardening
$41.70
Thickened Resin Vegetable Planter Box - Rectangular Plastic Balcony Pot for Growing Vegetables and Flowers
$101.00
SEATOSUMMIT Outdoor Travel Portable Waterproof First Aid Kit Wilderness Survival Personal Medical Folding Storage Bag
$79.00
Commercial Gas Storage Water Heater, Condensing Low-NOx Boiler, Fully Automatic Natural Gas Hot Water Furnace for Hotels
$13,175.00
SH1.0/1.25/ZH1.5/PH2.0XH2.54 Electronic Wire Connector Terminal Cable 2P-12P
$0.04
VFD Capacitor ALS30A1363KJ/ALS30C1024NP/ALS30C1023NP
$500.00
200X18DNNmm L Shape Stainless Stel Corern Brace Repeair Ang
$88.28
Quilling Paper Set Gradient Color Tool Kit Handmade Quilling Strips Basic Packaging for Fine Line Coloring
$38.00
Standard Ou Kai Calligraphy Beginner's Sun Tzu's Art of War & Thirty-Six Stratagems Small Regular Script Brush Copybook Xuan Paper Long Scroll for Tracing
$18.00
Mold Release Oil for Incense Beads and Tags - Colorless, Odorless, Food-Grade Auxiliary Release Agent
$8.00
Tafara Aromatherapy Matches - Premium Extended-Length Safety Matches for Incense Burners (20 Count)
$23.80
Magnetic Sponge Holder and Steel Wool Rack for Sink, Stainless Steel No-Drill Kitchen Organizer
$9.94
Touchmark Square Sketchbook for Acrylic Markers - Thick Paper Art Journal for Quick-Dry, Smudge-Free Drawing
$10.80
Mo Hao Detail Brush Set, Goat Hair Liner, Wolf Hair Round/Flat Brushes for Oil Painting, Art & Gouache
$78.00
Authentic Military-style Socks for Men - Summer and Winter Anti-odor Sweat-absorbing Mid-calf Black and Navy Blue Training and Sports Socks
$23.80
Alliance Authorized Plaque - Yoga Alliance RYT, Pilates Alliance, International Yoga Alliance, China Yoga Alliance
$380.00
![[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)
