Attributes

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

6 reviews

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.

5 FAQ

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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