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MQ-7 Carbon Monoxide (CO) Gas Sensor Module

MQ-7 Carbon Monoxide (CO) Gas Sensor Module

ParameterDetailed Specification
Operating Voltage5V DC
Target GasCarbon Monoxide (CO)
Detection Range10ppm – 1000ppm (CO)
Heating Voltage5.0V ± 0.1V (High) / 1.5V ± 0.1V (Low)
Load ResistanceAdjustable via Potentiometer
Output TypeDual Output: Digital (DO) & Analog (AO)
Comparator ChipOn-board LM393
                                 Price

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₹ 118.64 ₹ 118.64
(Tax included)

Barcode: 2655804

Product Description

Ensure your environment is safe with the MQ-7 Carbon Monoxide (CO) Gas Sensor Module. Specifically engineered to detect Carbon Monoxide—a colorless, odorless, and highly toxic gas—this module is a critical safety component for homes and workplaces. At Robogears, we recommend the MQ-7 for its high sensitivity and fast response time. The module operates on a dual-voltage heating cycle, alternating between high and low temperatures to accurately absorb and detect CO levels while cleaning the sensing element. Featuring an LM393 comparator, it provides a stable digital signal to trigger alarms and an analog signal for precise PPM (Parts Per Million) data logging. Whether you are building a fireplace monitor or an industrial safety hub at your Pimpri facility, the MQ-7 offers a reliable and cost-effective detection solution.

Detailed Key Features

  • CO-Specific Sensitivity: Optimized for detecting Carbon Monoxide concentrations from 10 to 1000 ppm, providing an early warning for hazardous leaks.

  • Dual Signal Interface: Features both a Digital Output (DO) for direct relay/buzzer triggering and an Analog Output (AO) for real-time concentration graphing.

  • Intelligent Heating Logic: Designed to work with a pulsed heating voltage (High for 60s / Low for 90s) to maximize CO detection accuracy and sensor longevity.

  • Threshold Calibration: Includes a multi-turn potentiometer that allows you to set the exact CO level at which the digital alarm should activate.

  • Real-Time Visual Indicators: Equipped with a power LED and a signal LED that lights up immediately when CO levels exceed the safe limit.

All Technical Details

  • On-board Processing: The LM393 comparator ensures a clean digital square wave, free from the noise typical of analog-only sensors.

  • Durable Sensing Layer: Uses a high-quality Tin Dioxide (SnO2) semiconductor layer for long-term operational stability.

  • Compact Integration: Features a 3mm mounting hole, making it easy to fit into custom safety enclosures or robotic chassis.

  • Applications: Residential CO alarms, automotive exhaust monitoring, underground parking sensors, and smart HVAC systems.

Prototyping & Engineering Tips (Robogears Exclusive)

  • The "Burn-In" Period: At our Pimpri workshop, we emphasize a 48-hour preheat for brand-new MQ-7 sensors. For accurate readings, the sensor should be powered on for at least two days before final calibration to stabilize the sensing element.

  • Heating Cycle Implementation: To get professional-grade accuracy, use your Arduino code to switch the heater between 5V (cleaning phase) and 1.5V (measurement phase). If you run it at a constant 5V, the sensor will be overly sensitive and prone to false alarms.

  • Normal Operating Heat: It is normal for the sensor to feel warm to the touch. The internal heater is essential for the chemical reaction between the CO gas and the SnO2 layer.

  • Placement Strategy: Carbon Monoxide is slightly lighter than air. For the best detection in a room, mount the MQ-7 at eye level or higher, rather than near the floor.

Package Includes

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

Image Disclaimer

Product images are shown for illustrative purposes only. The color of the PCB (typically Blue or Black) or the protective mesh style may vary slightly between batches, but the MQ-7 Carbon Monoxide detection performance and 5V compatibility remain as described.

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