The MQ-7 Gas Sensor Module is a 32mm x 20mm x 22mm SnO2 semiconductor sensor dedicated specifically to carbon monoxide (CO) detection across 10 to 1,000 ppm, operating from 2.5V to 5V — a wider voltage range than most MQ-series sensors which typically fix at 5V — across -20°C to 50°C ambient temperature. The mq7 gas sensor uses a dual-voltage heating cycle similar to MQ-9, but focused entirely on CO: a high-voltage heating phase cleans the sensor surface of residual gases, followed by a low-voltage phase during which CO concentration is measured most accurately.
The mq7 sensor 10 to 1,000 ppm detection range is narrower and more sensitive at low concentrations than MQ-9’s 200-10,000 ppm — this matters because dangerous CO exposure for humans begins around 50-100 ppm, so the gas sensor mq7 lower-range sensitivity suits indoor CO safety alarms better than broader-range combustible gas sensors. The CO Detector Sensor heating resistance of ±31Ω is a circuit design parameter for the heater driving stage, relevant when designing custom PCBs rather than using pre-built breakout modules. The mq7 co sensor analog output requires the same heater warm-up considerations as other MQ-series sensors.
the dual-voltage heating cycle requires firmware timing similar to MQ-9, adding complexity compared to single-phase sensors, but the resulting CO-specific accuracy is important for life-safety CO alarm applications. This MQ-7 gas sensor module is ideal for project developer and makers developing carbon monoxide detection systems, safety monitoring devices, and embedded gas sensing projects with reliable CO measurement capabilities.
Related Products:
- Checkout The MQ-135 Gas Sensor Module
Features:
- CO-dedicated sensing with dual-voltage heating cycle for accuracy
- 10-1000ppm range matches dangerous human CO exposure thresholds
- 2.5V to 5V wider voltage range than most MQ sensors
- ±31Ω heating resistance spec relevant for custom PCB designs
- -20°C to 50°C suits indoor residential CO alarm placements
Technical Specifications:
 Applications:
- MQ-7 Sensor used for Arduino indoor CO safety alarm build
- College project uses mq7 gas sensor for CO detection safety demo
- Home safety uses mq7 sensor for India kitchen CO monitoring
- Garage uses gas sensor mq7 for vehicle exhaust CO alarm build
- IoT monitor uses CO Detector Sensor for remote CO level logging
Package Includes:
- 1 x MQ-7 Gas Sensor Module
Mithun Shetty –
Packed carefully with transparent checkout process, and the support team was helpful with project integration and sensor usage guidance.
Sharath Alva –
This module provides reliable carbon monoxide detection and is suitable for electronics projects, air quality monitoring systems, and educational experiments
Nishmitha Poojary –
Pan India delivery available
Pradeep Mallya –
Reliable store product
Aadarsh Rai –
Best purchase ever