MQ-7 Carbon Monoxide (CO) Gas Sensor Module
High-Sensitivity Detection for Safety and Monitoring Systems
The MQ7 gas sensor module is a costeffective, low-power solution designed specifically for detecting carbon monoxide (CO) in the air [citation:1][citation:5][citation:11]. Utilizing a tin dioxide (SnO2) semiconductor sensitive layer, its conductivity increases with the concentration of CO, making it ideal for home and industrial safety applications [citation:11].
Carbon Monoxide Specific High sensitivity to CO with a detection range of 1010,000 ppm [citation:5][citation:6]
Dual Output Modes - Provides both an analog (AO) signal proportional to gas concentration and a digital (DO) trigger signal [citation:1][citation:5]
Operating Voltage is 5V DC. Requires a preheat time of up to 48 hours for optimal stabilization.
Use the onboard potentiometer to adjust the digital output threshold sensitivity [citation:1][citation:5].
Technical Specifications
| Parameter | Value |
|---|
| Target Gas | Carbon Monoxide (CO) [citation:1][citation:5] |
| Detection Range | 10-10,000 ppm [citation:5][citation:6] |
| Operating Voltage | 5V DC [citation:5][citation:10] |
| Output Signal | 0-5V Analog (AO) & TTL Digital (DO) [citation:1][citation:5] |
| Load Resistance | 10kΩ (adjustable) [citation:11] |
= Key Features =
High Sensitivity - Excellent response to carbon monoxide and hydrogen [citation:3][citation:7].
Fast Response - Response time of ≤1 second [citation:5].
Adjustable Sensitivity Builtin potentiometer for setting the digital trigger threshold [citation:5].
Long Service Life - Stable and durable construction [citation:3][citation:7].
Easy to Interface Standard 4pin header (VCC, GND, DO, AO) compatible with microcontrollers [citation:1][citation:12].
= Applications =
- Residential and industrial CO detectors [citation:2][citation:5].
- Gas leak alarm systems [citation:2].
- Air quality monitoring [citation:5].
- IoT and DIY environmental safety projects [citation:2].
Reliable Safety Component - Widely used for carbon monoxide detection with Arduino [citation:2][citation:12].
Wide Compatibility - Works with Arduino, ESP32, and other 5V logic systems.
√ On-board power and signal indicators.
√ 4 mounting holes for secure installation [citation:5].
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