Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Sensor Type	MQ-7 Semiconductor Gas Sensor
Target Gas	Carbon Monoxide (CO)
Operating Voltage	5V DC
Output Signal	Digital Switch Output (0 and 1) & Analog Output
Detection Range	20 to 2000 ppm
Preheat Time	Approx. 24-48 hours for initial stabilization
Adjustable Sensitivity	Yes, via onboard potentiometer
Interface	3-pin connector (VCC, GND, DO/AO)
PCB Dimensions	32mm x 20mm x 15mm
Application	Home safety alarms, industrial leak detection, DIY electronics

6 reviews

Anonymous

Mar 31, 2026

Rating: 4/5

Good sensor, requires patience

The sensor is sensitive and responsive to CO sources like a lit candle near the unit. Just remember that it needs a long burn-in period before readings are accurate. Great value for the price.

Anonymous

Mar 30, 2026

Rating: 5/5

Reliable detection

I tested this against a professional handheld detector, and the trends matched well. It's not a replacement for certified life-safety equipment, but excellent for prototyping and educational purposes.

Anonymous

Mar 27, 2026

Rating: 5/5

Great learning tool

As someone new to gas sensors, this kit was perfect. It came with clear pinout labels. I successfully built a simple buzzer alarm that triggers when CO levels rise. Highly recommended for beginners.

Anonymous

Mar 10, 2026

Rating: 5/5

Perfect for my home safety project

This MQ-7 module works exactly as described. I integrated it into an Arduino-based alarm system for my garage. The analog output is stable after the recommended preheat time, and the digital threshold is easy to adjust with the potentiometer.

Anonymous

Mar 09, 2026

Rating: 5/5

Easy to interface

Wiring was straightforward. The digital output goes high immediately when gas is detected if calibrated correctly. The documentation provided by the seller helped me get started quickly.

Anonymous

Mar 02, 2026

Rating: 4/5

Solid build quality

The PCB looks clean and the soldering points are solid. The sensor element is well-protected by the mesh cap. Only downside is the power consumption is a bit higher than expected due to the heater.

5 FAQ

Q: How long does the sensor need to warm up before use?

A: For best accuracy, we recommend powering the sensor continuously for at least 24 to 48 hours initially. After that, it typically needs a few minutes of warm-up each time it is powered on.

Q: Can this detect natural gas or methane?

A: This MQ-7 module is specifically tuned for Carbon Monoxide (CO). While it may show some reaction to other combustible gases, it is not optimized for Methane or Natural Gas. We recommend the MQ-5 or MQ-6 for those gases.

Q: Is the output voltage compatible with 3.3V logic boards?

A: The module operates at 5V. While the analog output scales with voltage, the digital output high level will be 5V, which may damage 3.3V boards. We suggest using a logic level converter if connecting to 3.3V systems.

Q: What is the maximum current draw?

A: The heating element typically draws around 150mA to 200mA at 5V. Please ensure your microcontroller or power supply can handle this current load.

Q: Does this module require a specific library for Arduino?

A: No specific library is required. You can read the analog value using the standard analogRead() function and the digital state using digitalRead().

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