Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Sensor Type | MQ-7 Semiconductor Gas Sensor |
| Detection Target | Carbon Monoxide (CO) and Combustible Gases |
| Operating Voltage | 5V DC |
| Output Signal | Analog Voltage (0-5V) and Digital TTL |
| Heating Voltage | 5.0V ± 0.2V |
| Load Resistance | Adjustable via On-board Potentiometer |
| Response Time | < 30 Seconds |
| Recovery Time | < 60 Seconds |
| Interface | 3-Pin Header (VCC, GND, DO/AO) |
| Dimensions | 32mm x 20mm x 14mm |
Anonymous
Mar 25, 2026
Rating: 5/5
Great addition to my workshop alarm
I built a custom ventilation trigger for my garage workshop. This sensor reliably triggers the fan when I run the engine indoors. It gives me peace of mind knowing the system is monitoring CO levels actively.
Anonymous
Mar 19, 2026
Rating: 4/5
Good sensitivity, needs warm-up
The module detects CO very well once it has warmed up. Just remember that these sensors need about 24-48 hours of initial burn-in for best stability, and a few minutes of warm-up each time you power them on. Otherwise, solid performance.
Anonymous
Mar 09, 2026
Rating: 5/5
Reliable for student projects
We bought ten of these for our university robotics lab. They are consistent across all units and handle the 5V logic level perfectly. The build quality is decent for a hobbyist component.
Anonymous
Mar 07, 2026
Rating: 5/5
Perfect for Arduino Safety Projects
This sensor works exactly as described. I integrated it into a home safety prototype using an Arduino Uno. The analog output is stable, and the digital threshold is easy to adjust with the onboard potentiometer. Great value for the price.
Anonymous
Mar 03, 2026
Rating: 5/5
Easy to interface
Plug and play with Raspberry Pi and Arduino. The documentation online is plentiful, and the module itself is straightforward. The LED indicator is a nice touch for quick visual debugging.
Anonymous
Mar 02, 2026
Rating: 4/5
Works well but consumes power
The detection capability is excellent. However, keep in mind the heating element draws significant current (around 150mA), so it's not ideal for battery-powered applications unless you implement a sleep cycle. For plugged-in projects, it's great.
Q: Can I connect this directly to a 3.3V microcontroller like ESP32?
A: The sensor requires a 5V supply for the heater to function correctly. While the analog output may work with 3.3V logic, it is safer to use a voltage divider or a logic level converter for the signal pin to protect your 3.3V board.
Q: Does this module come with a library for Arduino?
A: The hardware itself does not include a physical library card, but there are many open-source libraries available in the Arduino IDE Library Manager (search for 'MQ-7' or 'Gas Sensor') that make reading the analog values very easy.
Q: What is the lifespan of the heating element?
A: Under normal operating conditions with proper voltage, the heating element typically lasts for several thousand hours. Continuous operation without cycling is recommended for the most stable readings during the measurement phase.
Q: Can this sensor detect natural gas or just carbon monoxide?
A: While primarily calibrated for Carbon Monoxide (CO), the MQ-7 is also sensitive to other combustible gases like hydrogen, methane, and propane. However, for specific natural gas leak detection, an MQ-5 or MQ-6 might offer better specificity.
Q: How often should I calibrate the potentiometer?
A: You generally only need to set the potentiometer once during your initial setup to define the threshold for the digital output pin. Unless your environmental conditions change drastically, re-calibration is rarely needed.
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