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.
Natural Crystal Morganite Pink Loose Beads - Single Round Beads for DIY Jewelry Making and Craft Accessories
$0.89
Mini Pencil Sharpener for Elementary Students - Small Manual Crank Sharpener for Kids' Pencils
$1.89
Bamboo Flute Bar Dynamic Sheet Music Book for Accompaniment, Sight-Reading, and Rhythm Practice
$221.00
Multi-Function Thickened Industrial Scouring Pad for Cleaning, Stainless Steel Brushing, Rust Removal, and Emery Cleaning
$7.80
Natural Light Yellow Azeztulite Loose Beads for DIY Jewelry Making and Craft Supplies
$2.00
Expanded Clay Pebbles for Gardening - Pot Bottom Layer, Surface Mulch, Soil-Free Hydroponics for Flowers, Succulents, Orchids - Breathable Planting Medium
$7.70
1/5 Pack Silicone Kitchen Utensils Set for Cooking Baking
$43.12
Aizaofang 6-Cavity Triple Flower Silicone Mold - DIY Handmade Soap Home Decor - Food-Grade Heat-Resistant Material
$12.70
Single-Leg Manganese Steel Lifting Hook with Wide Opening for Hoists and Cranes
$92.00
Hesdick HZL-32 Portable Stone Removal Hook, Multi-Function Groove Tool for Car Tire Debris Cleaning
$9.28
PC Bonding Sealing Waterproof UV1901 Guardrail Tube Adhesive Shadowless Glue UV Glue Electronic Glue
$859.00
Wan Dian Wu Xian Stackable Toy Accessories - Vol.3 Prosperous Era Series Blind Capsule Figures for Desktop Display
$29.00
In Stock Commercial Vegetable Chopper and Meat Mincer - Grinding Machine for Baozi Fillings, Chili Dumplings, and Sausage WTP Meat Paste Processing
$5,805.00
Industrial Lint-Free Cloth for Cleaning Lenses, Optical Instruments, and Phone Screens; Microfiber Dusting Wipes
$81.58
Electric Barrel Water Dispenser Pump Automatic Water Lifter for Mineral and Purified Water
$74.00
F01RB0WA23 Transmission Valve for Roewe DQCT280 Remanufactured
$324.00
Full Payment Pre-order Guzi Bear DMMD Dramatical Murder Badge Polaroid Set Merchandise
$29.00
Peach Wood Sheepskin Rattle and Clapper Brass Traditional Handmade Baby Teething Hand Drum Newborn Gift Box
$29.90
Pirelli Run-Flat Tires 235/245/255/265/275/285 40 45 50 55R19R20R21
$350.00
Protective Case Lid for Pelican Cases - Laptop Insert for Models 1510, 1560, and 1535
$254.00
Universal 5800 Super Glue for Plastic, Metal, Glass, and Wood, 10-Second Fast Curing
$2.01
White Noise Wood Chip Core Grid Scented Candle Wooden Core S-Type Brand Name Candle Container Soy Candle Core Wood
$1.50
Zunjue 100% Cotton Paper Block 300g Watercolor Paper, Fine/Medium Grain, Thickened 80 Sheets, Neutral Acid-Free Journal Paper for Art Students, Beginners, Watercolor, Colored Pencil, Pen, Light Wash, Marker
$27.20
Outdoor Waterproof Dry Bag for Rafting and Creek Walking - Large Capacity Backpack for Swimming, Hiking, Diving, and Flood Rescue
$132.00
Lukang 995 Door and Window Fast-Drying Glass Sealant - Transparent Weather-Resistant Neutral Silicone Structural Adhesive
$222.90
Large Flip-Type Water Draining and Air Drying Machine, Fully Automatic Air Knife Blower for Vegetables, Commercial Continuous Drying Equipment
$15,282.00
Large Capacity Household Quilt Storage Bag - Waterproof and Moisture-Proof Duvet Organizer for Moving, Packing, and Luggage Sorting
$5.88
Scented Candle Aluminum Alloy Turntable 360-Degree Rotating Double-Sided Silent Non-Slip Small Turntable for Cake Decorating and DIY
$30.40
Ceramic Five Oxen Painting Brush Washer – Antique-Style Ink Well for Calligraphy & Traditional Painting
$16.90
Liupintang 3-in-1 Brush Washing Bucket with Palette - Portable Handheld Multi-Function Art Tool for Chinese Painting, Watercolor, and Gouache, Foldable Small Pail
$17.80
![[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)
