Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Detection Gas | Formaldehyde (CH2O) |
| Model Number | CJSH22-CH2O |
| Operating Voltage | 3.3V - 5V DC |
| Output Signal | UART / PWM |
| Response Time | < 30 seconds |
| Power Consumption | < 50mW |
| Operating Temperature | -10°C to 50°C |
| Dimensions | 20mm x 15mm x 8mm |
| Sensor Life | > 5 years |
| Application | Air Quality Monitoring, Smart Home Systems |
Anonymous
Mar 27, 2026
Rating: 5/5
Low power consumption as advertised
I am using this in a battery-powered device, and the low power draw is a game changer. It detects formaldehyde spikes quickly when I bring new furniture into the room.
Anonymous
Mar 22, 2026
Rating: 4/5
Compact and effective
Very tiny form factor which fits perfectly inside my custom enclosure. It reacts well to alcohol-based cleaners too, so keep that in mind during testing.
Anonymous
Mar 09, 2026
Rating: 5/5
Perfect for my air quality project
This module is incredibly small and easy to integrate with an ESP32. The readings seem consistent when compared to my standalone meter. Great value for the precision offered.
Anonymous
Mar 07, 2026
Rating: 4/5
Good sensitivity, fast shipping
Works well out of the box. It took about 2 minutes to warm up, but then the data stream was stable. Deducting one star because the documentation could be more detailed regarding calibration.
Anonymous
Mar 05, 2026
Rating: 5/5
Excellent precision for the price
I was skeptical about the 'high precision' claim at this price point, but it holds up. The voltage requirements are flexible, making it easy to power from various sources.
Anonymous
Mar 04, 2026
Rating: 5/5
Reliable industrial grade component
Bought five units for a prototype. All of them performed identically. The UART output is clean and easy to parse. Highly recommended for professional prototypes.
Q: What is the communication protocol used by the CJSH22-CH2O?
A: The module supports both UART (TTL level) and PWM output. You can select the mode via the configuration pins as described in the datasheet.
Q: How often does the sensor need recalibration?
A: Under normal operating conditions, the sensor maintains calibration for over a year. For critical applications, we suggest an annual check against a reference gas source.
Q: Can this sensor detect other VOCs besides formaldehyde?
A: While optimized specifically for Formaldehyde (CH2O), the sensor may show some cross-sensitivity to other volatile organic compounds like alcohol or benzene, but the primary output is calibrated for CH2O.
Q: Is this suitable for outdoor use in rain?
A: No, this is a bare module and is not water-resistant. It must be housed in a protective enclosure with proper airflow if used in outdoor or humid environments.
Q: Does this module require a warm-up period before giving accurate readings?
A: Yes, we recommend allowing the sensor to warm up for approximately 2 to 3 minutes after powering on to ensure stable and accurate baseline readings.
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
Xiupu Fraycolor Marker Airbrush Kit for Figure Model Painting Portable Rechargeable Airbrush and Pump Set
$127.00
Caoyige Thickened Felt Calligraphy Mat with Bound Edges - Ideal for Students and Beginners Practicing Brush Writing
$4.93
Colored Paper Signing Board CP Autograph Panel Japanese Anime Drawing Paper Watercolor Paper Square Blank Signature Card for Markers Anime OC Hand-Drawn Cards
$10.80
![[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)
