MQ-7 CO Carbon Monoxide Coal Gas Sensor Module
Review: 5 - "A masterpiece of literature" by John Doe, written onMay 4, 20020
MQ-7 Sensor Module

MQ-7 CO Carbon Monoxide Coal Gas Sensor Module

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  • Product SKU: KG055
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The MQ-7 CO Carbon Monoxide Coal Gas Sensor Module is a widely used sensor for detecting carbon monoxide (CO) gas, particularly in environments where this toxic gas might be present.

Here's an overview of the MQ-7 sensor module:

Purpose: It has a high sensitivity to carbon monoxide gas.

Sensitivity: It has a high sensitivity to methane and other combustible gases.

Principle: The sensor operates on the principle of a semiconductor gas sensor, where the resistance of the sensing material changes based on the concentration of CO gas.


Analog and Digital Output: Similar to other MQ series sensors, the MQ-7 module provides both analog and digital outputs. The analog output can be used to estimate the gas concentration, while the digital output can be configured to trigger alerts when CO concentration exceeds a predefined threshold.

Adjustable Sensitivity: Many modules include a potentiometer that allows users to adjust the sensor's sensitivity.

Affordability: The MQ-7 sensor module is cost-effective, making it a popular choice for gas detection projects.


Safety Applications: The MQ-7 sensor is used for detecting carbon monoxide in environments like homes, offices, and industrial areas to ensure safety and prevent CO poisoning.

Indoor Air Quality: It can be utilized to monitor indoor air quality and ensure that CO levels are within safe limits.

Combustion Monitoring: The sensor can also be used to monitor combustion processes and detect the presence of CO in areas like furnaces, gas heaters, and stoves.

Using the MQ-7:

Powering the Sensor: The sensor typically requires a 5V DC power supply.

Calibration: To achieve accurate readings, calibration may be necessary. This involves exposing the sensor to clean air to establish a baseline resistance value.

Reading Values: Like previous MQ series sensors, you can use a microcontroller (such as Arduino) to read values from the MQ-7 sensor. Connect the analog output to an analog pin and the digital output to a digital input pin on the microcontroller.


Warm-Up Time: The sensor may require some time to warm up before it provides reliable readings.

Cross-Sensitivity: The MQ-7 sensor might exhibit cross-sensitivity to gases other than carbon monoxide. This can impact accuracy if other gases are present in the environment.

Environmental Factors: As with all gas sensors, environmental conditions like temperature and humidity can influence their performance.

When integrating the MQ-7 CO Carbon Monoxide Coal Gas Sensor Module into a project, proper calibration and considering potential cross-sensitivity are crucial for obtaining accurate and reliable CO concentration readings, especially due to the toxic nature of carbon monoxide.

Standard Test Conditions Of MQ-7 Sensor Module

  • Temperature: 20°C ± 2°C
  • Humidity: 65% ± 5% RH
  • Standard Test Circuit: Vc: 5.0V ± 0.1V; Vh(high):5.0V±0.1V
  • Vh(low): 1.5V±0.1V

Technical Details

  • Model: MQ-7
  • Operating voltage (v): DC 5
  • Range: 10 ~ 1000 ppm
  • Characteristic gas: 100 ppm CO
  • Sensitivity : ≥ 3%.
  • Return time: ≤ 30 sec
  • Heating resistance: ± 31 Ω
  • Heating current: ≤ 180 mA
  • Heating voltage : 5.0V ± 2V / 1.5 ± 1V
  • Heating power: approx. 350 mW
  • Ambient temperature (°C) : -20 ~ + 50
  • Humidity: ≤ 95% RH
  • Oxygen content: 21%.

Physical Attributes: MQ-7 Sensor Module

  • Length * Width * Height (mm): 32 x 20 x 15
  • Weight (gm): 7

Integration with Arduino

MQ-7 Sensor Module

Sample Code

Additional Details

  • The analog output voltage, the higher the concentration the higher the voltage.
  • The carbon monoxide detection with better sensitivity.
  • There are four screw holes for easy positioning.
  • With a long service life and reliable stability.
  • Rapid response and recovery characteristics.

Product Video


Package Includes

  • 1 x MQ-7 CO Carbon Monoxide Coal Gas Sensor Module

Customer Reviews

Based on 8 reviews
Taslim Arif Nuruz Zaman

MQ-7 CO Carbon Monoxide Coal Gas Sensor Module

Vikas Agarwal


Kethan Shetty


Indranil Adhikary

Received. Didn't test it yet.

Harshit NAGAR

Corresponds to the description. Delivered to Bangalore in 5 day.

Tiara Torp

MQ-7 CO Carbon Monoxide Coal Gas Sensor Module

Sanchit Sachan

the order sent very quickly. Tracked all the way. Order came in 2 days. Came in the composition of the general parcel. It's all right. recommend kitsguru

Vineet Tyagi

It's been quick, it comes well protected in bubble plastic and everything is perfect. A great salesman. Thank you very much kitsguru.