Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Sensor Type | MAX44009 (Light) & BME280 (Temp/Humidity) |
| Communication Interface | UART Serial / TTL |
| Operating Voltage | 3.3V - 5V DC |
| Light Measurement Range | 0.045 to 188,000 Lux |
| Temperature Range | -40°C to +85°C |
| Humidity Range | 0% to 100% RH |
| Baud Rate | 9600 bps (Default) |
| PCB Dimensions | 24mm x 18mm x 4mm |
| Mounting Hole Diameter | 3mm |
| Application | Arduino, Raspberry Pi, IoT Projects |
Anonymous
Mar 23, 2026
Rating: 5/5
Perfect for my weather station project
This module works flawlessly with my Arduino setup. The serial output is clean and easy to parse. Both the light sensor and the BME280 provide accurate readings compared to my calibrated instruments.
Anonymous
Mar 20, 2026
Rating: 5/5
High precision as advertised
I needed a compact solution for monitoring indoor conditions and ambient light. The MAX44009 handles bright sunlight without saturating, which was a problem with my previous LDR setup.
Anonymous
Mar 19, 2026
Rating: 5/5
Excellent beginner sensor module
As someone new to electronics, I found this very easy to use. The community support for these chips is huge, so finding code examples was simple. Works great out of the box.
Anonymous
Mar 17, 2026
Rating: 5/5
Easy integration
Plug and play with standard UART libraries. The data stream is consistent, and the humidity readings stabilize quickly after power-on. Highly recommended for prototyping.
Anonymous
Mar 15, 2026
Rating: 4/5
Solid performance for plant monitoring
Using this to automate my greenhouse lights and fans. The temperature and humidity accuracy is spot on. Would love if it came with header pins pre-soldered, but that's a minor issue.
Anonymous
Mar 14, 2026
Rating: 4/5
Great value, minor wiring confusion
The sensors are high quality and respond quickly. I deducted one star because the pinout diagram on the back was slightly faint, but once wired correctly, it performs excellently.
Q: How do I calibrate the humidity sensor if it reads high?
A: The BME280 is factory calibrated. If readings seem off, ensure the sensor has been powered on for at least 5 minutes to stabilize. Persistent offsets may require software correction in your code based on a reference meter.
Q: Is the enclosure waterproof for outdoor use?
A: No, the PCB is not waterproof and does not come with an enclosure. For outdoor applications, you must house it in a suitable weatherproof case while ensuring the sensors have air exposure.
Q: What is the default baud rate for the serial output?
A: The factory default baud rate is 9600 bps. You can change this via software commands if your project requires a different speed.
Q: Can I power this directly from a 5V USB source?
A: Yes, the module includes an onboard voltage regulator and accepts input voltages between 3.3V and 5V, making it safe to connect directly to a 5V USB power supply.
Q: Does this module support I2C communication or only Serial?
A: This specific GY-39 model is configured for UART Serial communication by default. While the individual chips support I2C, the onboard circuitry routes them to the TX/RX pins for serial output.
![[Shenzhen Best Seller] Premium Wearable Negative Ion Air Purifier - Neck-Hanging Portable Electronic Mask](https://www.gosteppe.com/cache/small/product/268987/legacy-main-5f71c8070119587e6427efe9.webp)
[Shenzhen Best Seller] Premium Wearable Negative Ion Air Purifier - Neck-Hanging Portable Electronic Mask
$298.00
Teruisi Electric Fruit and Vegetable Slicer, Multifunctional Chopper for Cafeterias and Hotels, Cutter for Green Onions, Chili Peppers, Radishes, and Ginger
$3,798.00
Waterproof Phone Pouch for Diving, Swimming, Rafting, and Hot Springs, Sealed Underwater Storage Bag with Waist Strap
$12.90
Premium Thick Cardstock Lin Zexu Representative Small Regular Script Infinite Life Sutra Close-Up Copying Calligraphy Copybook Regular Script for Beginners
$39.80
Zunjue Ticket-style 100% Cotton Watercolor Paper 300g Cold Press for Artists with Deckled Edges
$10.20
Kids' 3D Printing Pen – 3D Stereoscopic Drawing Toy for Girls, Perfect Birthday Gift
$104.66
Mifaner Handmade Watercolor Sketchbook – Oil Painting Series Canvas Journal, Travel-Friendly Mini Notebook for Acrylic Markers
$16.90
(Sasha Exclusive) Fat Small Card
$1,399.00
Silicone Faucet Side Drain Mat, Foldable Splash-Proof Pad for Kitchen Sink and Bathroom Washbasin
$4.93
Breathable Portable Invisible Aligner Case with Lanyard – Durable Hygienic Storage for Orthodontic Retainers and Dentures
$18.10
Snail-Specific Slug & Snail Killer Scatter-Type Anti-Pest Granules for Vegetable Gardens Slugs Apple Snails Fruit & Vegetable Fields
$10.00
Industrial Scouring Pad for Woodworking, Paint Sanding, and Polishing - Ultra-Fine Hand-Tear Sheets
$135.70
Custom G80 Manganese Steel Lifting Chain - High-Strength Alloy Chain Rigging for Hoisting and Cranes
$655.00
High-Concentration Oxygen Generator for Aquaculture with High-Pressure Outlet, Ceramic Nano Disc, and Oxygen Dissolution Cone
$50.00
Paint Brush Rinser – Art Supply Cleaning Cup for Brushes, Palettes, and Pigment Washing
$21.80
Heidelberg Printing Press Paper Pressure Wheel Screen Printing Roller Felt Wheel Guanghua Beiren Paper Feed Wheel Laminating Machine Brush Wheel
$6.00
Baofeifan Bubble Squeeze Painting Kit for Kids - Foaming Textured Paper, Wood Pulp Cotton DIY 3D Art with Markers
$10.00
Westwood Portable Retainer Case for Elderly Dentures and Children's Orthodontic Correctors, Storage Box
$14.20
PELICAN 1510 Protective Safety Case with Trolley - Waterproof Travel Box for Outdoor Photography Gear
$1,360.00
![Haisen [Exclusive Purchase Link] Livestream Link for New Arrivals and Clearance - Incense Sticks, Coil Incense, Agarwood, Sandalwood, Powder, Burners](https://www.gosteppe.com/cache/small/product/268968/legacy-main-4bd453bbd9b19100c4fd925a.webp)
Haisen [Exclusive Purchase Link] Livestream Link for New Arrivals and Clearance - Incense Sticks, Coil Incense, Agarwood, Sandalwood, Powder, Burners
$13.80
Ultralight Silicone-Coated Waterproof Dry Bag for Outdoor River Trekking, Rafting, Swimming, Beach Use – Wet/Dry Separation Storage for Swimwear and Towels
$38.20
Food Warmer Cabinet, Room Temperature Commercial Constant-Temperature Display Case, Egg Tart Heating Cabinet, Small Countertop Sample Retention Cabinet, Chestnut, White
$239.00
Ultra-Narrow 8/9/10cm Bathroom and Kitchen Gap Storage Rack with Wheels
$15.90
Glow-in-the-Dark 3D Printing Pen for Kids, Low-Temperature Stereoscopic Graffiti Magic Pen, Drawing Toy, Birthday Gift for Girls
$21.80
Custom Insulated Steel Pipes from Factory - Heating Pipes for Residential Complexes, Spiral Insulated Pipes, Polyurethane Insulated Pipes
$45.40
New Pirelli Tires 305/40R20 112V & 275/45R20 110V XL N1 for Porsche Cayenne
$1,409.00
Over-Toilet Storage Rack Wall-Mounted No-Drill Bathroom Multi-Function Organizer for Toilet Essentials
$20.50
Kang Kati Gardenia Tea Scented Candle Gift Set – Long-Lasting Fragrance, Elegant Birthday Gift for Her
$35.10
Safety Self-Locking Lifting Hook with Adjustable Chain for Hoisting and Rigging
$140.00
Thickened Mobile Phone Waterproof Case, Waterproof Box, Sealed Container, Pressure-Resistant Box, EDC Drop-Proof Storage Box for Outdoor Travel
$12.00
![[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)
