Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Sensor Type | Digital Relative Humidity and Temperature |
| Communication Interface | I2C (Inter-Integrated Circuit) |
| Operating Voltage | 3.3V to 5.5V DC |
| Humidity Range | 0% to 100% RH |
| Temperature Range | -40°C to +125°C |
| Humidity Accuracy | ±2% RH (at 25°C) |
| Temperature Accuracy | ±0.3°C (at 25°C) |
| Response Time | 5 seconds (typical) |
| Package Type | DFN-6 Surface Mount with Breakout Board |
| Compatibility | Arduino, Raspberry Pi, ESP32, STM32 |
Anonymous
Mar 31, 2026
Rating: 5/5
Exceeded expectations
Bought this as an alternative to the more expensive SHT15 and honestly cannot tell the difference in performance for my use case. Fast shipping and well-packaged too.
Anonymous
Mar 29, 2026
Rating: 5/5
Perfect replacement for older SHT sensors
I needed a reliable sensor for my home weather station project and this HTU21D module works flawlessly. The I2C communication is stable, and the readings match my calibrated reference meter almost perfectly. Much easier to solder than the bare chip.
Anonymous
Mar 26, 2026
Rating: 4/5
Great accuracy for plant monitoring
Using this to monitor humidity in my indoor grow tent. It responds quickly to changes when I mist the plants. Only giving 4 stars because the breakout board pins are a bit close together for thick jumper wires, but otherwise excellent value.
Anonymous
Mar 20, 2026
Rating: 5/5
Stable long-term performance
I have three of these running in different rooms for over six months now. Zero drift observed and no connectivity issues. Highly recommended for any serious environmental monitoring application.
Anonymous
Mar 18, 2026
Rating: 5/5
Easy library support
Plug and play with standard Arduino libraries. I had data logging up and running in less than 20 minutes. The precision is noticeably better than the cheap DHT11 modules I used previously.
Anonymous
Mar 13, 2026
Rating: 4/5
Good value, small form factor
The module is tiny which is great for compact projects. Readings are consistent. Just make sure you have a 3.3V logic level if your microcontroller doesn't tolerate 5V on the data line, though the board seems tolerant.
Q: Do you provide a sample code library for ESP32?
A: Yes, we host example code for ESP32, Arduino, and Raspberry Pi on our GitHub repository. The link is included in the downloadable datasheet provided on the product page.
Q: Can I use this with a 5V Arduino Uno directly?
A: Absolutely. The module operates between 3.3V and 5.5V, making it fully compatible with 5V systems like the Arduino Uno. No logic level shifter is required.
Q: Is there a waterproof coating on the sensor element?
A: The sensor element has a protective polymer cover that resists dust and partial water immersion, but the PCB itself is not waterproof. For humid environments, conformal coating on the board is recommended.
Q: What is the sampling rate of this sensor?
A: The HTU21D can perform up to 10 measurements per second, though for high-precision applications, we recommend a interval of 1 to 2 seconds to allow the sensor to stabilize.
Q: Does this module come with pull-up resistors for the I2C lines?
A: Yes, the breakout board includes integrated 4.7kΩ pull-up resistors on both SDA and SCL lines, so you can connect it directly to your microcontroller without external components.
Selected Factory Low-Temperature 3D Printing Pen for Kids, Children's 3D Printing Pen Set, 3D Drawing Pen
$100.02
Milk Pasteurization Line - Small-Scale Yogurt Production Machine for Liquid Yogurt and Pasteurized Milk
$8,148.00
Commercial Small Heating Warmer Cabinet, Glass Constant-Temperature Countertop Display Case for Egg Tarts, Burgers, and Fried Chicken
$884.00
Custom Seal Stamp Engraving Personal Name Phone Number Private Chop
$5.89
Commercial Food Warmer Cabinet for Milk, Soy Milk, Burgers, Egg Tarts, Fried Chicken, Pies, Youtiao, and Bread Display
$1,355.00
PJ0040 Rose Embossed Cross Silicone Mold - For Candles, Aromatherapy, Soap, Plaster, and DIY Crafts
$11.20
Yuwell Oxygen Concentrator Control Board Motherboard 8F-3AW/8F-5AW/9F-5BW
$120.00
Leyingfang Floating Pen for Kids and Students - Water-Based Non-Toxic Erasable Whiteboard Pen for Drawing in Water, Large Capacity Suspension Pen
$18.00
Car Wheel Lug Nut Covers - Colorful Silicone Dust-Proof and Rust-Proof Caps for Tire Bolt Protection and Exterior Styling
$8.80
Automatic Stainless Steel Vegetable Slicer for Ginger, Potatoes, Carrots, Onions, and Cabbage - Commercial Dicing Machine
$3,951.36
![[Damai Holds Micro-Needle Hair Transplant Patent] Top Thinning Hair Transplant | Micro-Needle Density Enhancement (500 Units)](https://www.gosteppe.com/cache/small/product/270156/legacy-main-525bdaff56f89ee94752ef9c.webp)
[Damai Holds Micro-Needle Hair Transplant Patent] Top Thinning Hair Transplant | Micro-Needle Density Enhancement (500 Units)
$7,000.00
Little Leather Paper Strip Music Box (30-Note) Sheet Music - Contact Before Ordering; Specify Song Email for Digital Score Delivery
$1.00
Kitchen Sink Strainer Basket Push-Type Food Residue Separator Filter Hanging Storage Rack
$3.80
Heavy-Duty Heat-Treated CV Joint Puller Tool - Axle Ball Cage Removal and Installation Device for Automotive Repair
$66.00
Mobile Integrated Waste Transfer Station - 17 Cubic Meters Movable Compression Container
$159,443.00
Antique Glaze White Ceramic Brush Washer Large Brush Washer Water Pot Ink Stone Washing Calligraphy Painting Brush Washing Basin Four Treasures of the Study
$16.80
Authentic Chinese Philosophy Classics: Di Tian Sui, Qiong Tong Bao Jian, San Ming Tong Hui - Annotated & Illustrated Edition
$29.90
Household Disposable Kitchen Sink Garbage Filter Mesh Drain Pool Dishwashing Basin Strainer Vegetable Bowl Leftover Sink
$3.51
Continental Run-Flat Tires: 225/235/245/255/265 45/50/55 R17/R18/R19/R20/R21/R22
$357.00
Foldable Steel Tire Stone Removal Hook - Multi-Tool for Tire Repair, Stone Picking, and Emergency Window Breaking with Storage Bag
$11.70
Integrated Catalytic Combustion Unit RCO Furnace - Exhaust Gas Treatment System with Activated Carbon Adsorption-Desorption and Catalytic Combustion
$231,249.00
Universal Waterproof and Sunproof Cover for E-Bike Charger with Outdoor Storage Box
$11.85
Baohong Paper Brick Watercolor Paper Pad, Medium/Coarse Texture, Square/Round Shapes for Painting, Sketching, and Cotton Pulp Practice
$28.00
Commercial Food Warmer Cabinet for Pies, Youtiao, Burgers, Egg Tarts, and Fried Chicken, Heating and Temperature-Controlled Display Case
$977.00
Masking Tape Spray Paint Shielding Paper for Art Students and Sketching - Non-bleeding, Residue-free, Hand-tearable, Shoe-safe
$1.00
Electric Scooter and Motorcycle Hook - Multi-Functional Storage Hanger for Delivery Bikes and Cargo Boxes
$2.50
Huirui 420AB Fast-Drying Glue for Silicone - Bonds ABS, Stainless Steel, TPE, Rubber; High-Strength Instant Adhesive for Difficult Materials
$36.00
Color Proofing Instrument Ink Mixing Tool Sample Making Machine
$1,860.00
Variable Frequency Drive 0.75kW 2.6A Three-Phase 380V
$1,430.00
2026 Spring PEP New Edition Primary English Grade 3 Volume 2 Four-Line Three-Grid Word Cards for Teachers, Open Class Competition Creative Blackboard Design, Teaching Contest Blackboard Strips and Teaching Aids
$11.30
![[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)
