MQ-7 Carbon Monoxide (CO) Gas Sensor Module


In stock

  • CO Detection: Highly sensitive to carbon monoxide (CO) gas.
  • Wide Detection Range: Detects CO concentrations from 20 ppm to 2000 ppm.
  • Analog and Digital Outputs: Provides analog voltage and digital signals for easy integration.
  • Adjustable Sensitivity: Onboard potentiometer for sensitivity adjustment.
  • Fast Response Time: Quickly reacts to changes in CO levels.
  • Versatile Applications: Suitable for home, industrial, and environmental CO monitoring.


In stock


The MQ-7 Carbon Monoxide (CO) Gas Sensor Module is a highly sensitive, reliable, and easy-to-use device designed to detect carbon monoxide concentrations in the air. Utilizing the advanced sensing capabilities of the MQ-7 gas sensor, this module can measure CO levels from 20 to 2000 ppm, making it suitable for a wide range of applications, including home safety, industrial safety systems, and environmental monitoring. It integrates seamlessly with microcontroller platforms like Arduino, Raspberry Pi, and other embedded systems, providing real-time CO concentration data with high accuracy.

Key Features

  • High Sensitivity to CO: Detects carbon monoxide concentrations ranging from 20 ppm to 2000 ppm.
  • Fast Response and Recovery: Quickly responds to CO presence and recovers once the gas is cleared.
  • Analog Output: Provides an analog voltage output proportional to the CO concentration.
  • Digital Output: Includes a built-in comparator for easy threshold-based digital signal output.
  • Adjustable Sensitivity: Onboard potentiometer allows for fine-tuning the sensitivity threshold for digital output.
  • Heater Circuit: Built-in heater to ensure stable and consistent sensor performance.
  • Durable Design: Robust and long-lasting construction for reliable operation in various environments.
  • Easy Integration: Standard pin headers for simple connection to microcontrollers and development boards.
  • Low Power Consumption: Efficient operation suitable for continuous monitoring applications.


  • Home Safety: Ideal for use in home CO detectors to alert occupants of dangerous CO levels.
  • Industrial Safety: Used in factories and workplaces to monitor CO emissions and ensure worker safety.
  • Environmental Monitoring: Tracks CO levels in urban areas, tunnels, parking garages, and other environments.
  • Automotive: Monitors exhaust systems and indoor air quality in vehicles.
  • HVAC Systems: Ensures air quality by monitoring CO levels in heating, ventilation, and air conditioning systems.
  • Smart Home Integration: Adds CO detection capabilities to smart home automation systems.

Technical Specifications

  • Sensor Type: MQ-7 Carbon Monoxide Sensor
  • Detection Range: 20 ppm to 2000 ppm CO
  • Operating Voltage: 5V DC
  • Output Types:
    • Analog output (0-5V) corresponding to CO concentration
    • Digital output with adjustable threshold
  • Preheat Time: 20 seconds
  • Heater Voltage: 5V AC or DC
  • Dimensions: Typically around 32mm x 20mm x 22mm
  • Operating Temperature: -10°C to 50°C
  • Humidity Range: Less than 95% RH

Wiring and Connection

  1. Connect the Sensor to Microcontroller:
    • VCC: Connect to 5V power supply.
    • GND: Connect to ground.
    • AO: Connect to an analog input pin for reading CO levels.
    • DO: Connect to a digital input pin for threshold-based CO detection.
  2. Adjust Sensitivity:
    • Use the onboard potentiometer to set the desired threshold for the digital output.
  3. Code Integration:
    • Use analogRead() function for Arduino or equivalent for other platforms to read CO levels from the analog output.
    • Use digitalRead() to monitor the digital output for threshold-based alerts.

Why Choose Our MQ-7 CO Gas Sensor Module?

The MQ-7 CO Gas Sensor Module provides a dependable and efficient solution for monitoring carbon monoxide levels. Its high sensitivity, fast response time, and ease of integration make it an excellent choice for both DIY projects and professional safety systems. Whether you are ensuring the safety of a home, workplace, or public environment, this module delivers accurate and timely CO detection to help protect lives and property.

Choose our MQ-7 CO Gas Sensor Module to enhance your safety monitoring systems with reliable carbon monoxide detection. Perfect for a wide range of applications, this sensor module ensures you have the crucial data needed to maintain a safe environment.

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