A
Anonymous
Apr 15, 2026
Rating: 5/5
Reliable detection
Used this for a workshop monitoring system. Digital output triggers reliably.
Description
Tmall 14-Year Store Risym Weixin High-Quality Best Seller
Reviews
Attributes
| Brand | - |
| Category | Electronic Components / Maker DIY / Computer Hardware, Monitors & Peripherals |
| Origin | - |
| Sensor Model | MQ-7 |
| Detection Gas | Carbon Monoxide (CO) |
| Operating Voltage | 5V DC |
| Output Type | Digital DO and Analog AO |
| Comparator Chip | LM393 |
| Sensitivity | Adjustable via Potentiometer |
| PCB Size | 32mm x 22mm |
| Preheat Time | Approx. 24 Hours |
| Interface | 4-Pin Header |
| Application | DIY Electronics & Prototyping |
5 reviews
A
Anonymous
Apr 09, 2026
Rating: 4/5
Solid value
Good build quality for the price. Analog output gives nice granular data.
A
Anonymous
Feb 27, 2026
Rating: 5/5
Easy to use
Clear labeling on pins. Documentation online helped me get started quickly.
A
Anonymous
Feb 06, 2026
Rating: 5/5
Great for Arduino projects
Works perfectly with my Uno board. Easy to calibrate using the potentiometer.
A
Anonymous
Jan 29, 2026
Rating: 4/5
Good sensor module
Sensitive to CO changes. Remember to let it preheat for a day before relying on readings.
5 FAQ
Q: What is the detection range?
A: It detects CO concentrations typically between 20 to 2000 ppm depending on calibration.
Q: Is this certified for home safety alarms?
A: No, this is a development module for DIY projects and not a certified safety device.
Q: Can it detect smoke?
A: It is primarily tuned for Carbon Monoxide, though it may react to some combustion byproducts.
Q: How long does it take to warm up?
A: MQ-7 sensors typically require about 24 hours of initial preheating for stable readings.
Q: Does this work with 3.3V logic?
A: The module operates at 5V. For 3.3V systems, use a logic level converter.
