Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	MQ-7
Detection Gas	Carbon Monoxide (CO)
Operating Voltage	5V DC
Output Signal	Analog and Digital (TTL)
Heating Current	150mA (approx)
Sensitivity Range	20 - 2000 ppm
Response Time	< 60 seconds
Recovery Time	< 60 seconds
Interface Type	3-Pin Header (VCC, GND, DO/AO)
Dimensions	32mm x 20mm x 22mm

6 reviews

Anonymous

Mar 18, 2026

Rating: 5/5

Perfect for Arduino Projects

This sensor works flawlessly with my Arduino Uno. The analog output is stable after the initial warm-up period. Great value for the price.

Anonymous

Mar 18, 2026

Rating: 3/5

Works but gets hot

The sensor functions as described, but the heating element gets quite hot during operation. Make sure your enclosure has ventilation.

Anonymous

Mar 11, 2026

Rating: 4/5

Solid performance

We bought ten of these for our workshop. Most worked perfectly out of the box. One required a bit of soldering touch-up on the pins.

Anonymous

Mar 08, 2026

Rating: 5/5

Great for learning

Excellent component for understanding how gas sensors work. The dual output (analog/digital) makes it versatile for different microcontrollers.

Anonymous

Mar 07, 2026

Rating: 4/5

Good sensitivity, needs calibration

The module detects CO well, but you definitely need to calibrate the potentiometer for your specific environment. Instructions could be clearer.

Anonymous

Mar 05, 2026

Rating: 5/5

Reliable and Compact

Used this in a mobile robot project to detect gas leaks in simulated environments. It responds quickly and the digital output threshold is easy to adjust.

5 FAQ

Q: How do I adjust the sensitivity threshold?

A: There is a blue potentiometer on the board. Rotate it clockwise to increase sensitivity (lower threshold) and counter-clockwise to decrease sensitivity until the LED indicator triggers at your desired gas concentration.

Q: What is the logic level for the digital output pin?

A: The digital output (DO) provides a TTL signal, which means it outputs 0V for low and 5V for high, making it compatible with 5V microcontrollers like Arduino and ESP8266.

Q: Can this sensor detect natural gas or methane?

A: While the MQ-7 is optimized for Carbon Monoxide, it may show some cross-sensitivity to other combustible gases like hydrogen and methane, but for those, we recommend the MQ-4 or MQ-5 models for better accuracy.

Q: Does this module require a warm-up time before reading accurate values?

A: Yes, like most metal oxide sensors, the MQ-7 requires a warm-up period of approximately 24-48 hours for initial stabilization, and about 1-2 minutes before each accurate reading cycle.

Q: Is this sensor suitable for life-safety alarm systems in homes?

A: This module is intended for educational, prototyping, and industrial monitoring purposes. For residential life-safety alarms, please use certified UL-listed commercial alarm units.

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