MQ-7 Carbon Monoxide (CO) Gas Sensor Module – High Sensitivity CO Detector

The MQ-7 Gas Sensor Module is a highly sensitive and reliable device specifically designed to detect Carbon Monoxide (CO) gas in the air. Carbon monoxide is a colorless and odorless gas that can be extremely dangerous, making accurate detection essential for safety applications. The MQ-7 is widely used in home and office safety systems, industrial gas monitoring, and embedded electronics projects. The module provides both analog and digital output signals, allowing easy integration with microcontrollers such as Arduino, Raspberry Pi, ESP32, ESP8266, PIC, AVR, and other development platforms. Its fast response time, stable performance, and durable sensing element make it suitable for real-time CO detection and continuous monitoring applications.

WORKING PRINCIPLE

The MQ-7 operates using a metal oxide semiconductor (MOS) sensing element combined with a built-in heating element. When carbon monoxide gas is present, it reacts with the sensing material and changes the electrical resistance of the sensor. This resistance change is converted into an electrical signal that represents the concentration of CO in the air. The module outputs this signal as an analog voltage and also compares it against a preset threshold to provide a digital HIGH or LOW output. An onboard potentiometer allows users to adjust the sensitivity and detection threshold according to the required CO concentration level. For accurate measurements, the sensor requires a warm-up period to stabilize the heating element and sensing surface.

KEY FEATURES

The MQ-7 is optimized for detecting Carbon Monoxide gas with high sensitivity and quick response. It operates at 5 V DC and provides both analog and digital outputs with adjustable threshold control. The module includes a durable heating element that ensures stable and consistent performance over long periods. It features a simple 4-pin interface for easy connection and is designed for long lifespan and cost-effective operation. Compatibility with a wide range of microcontrollers makes it suitable for both hobby and professional applications.

APPLICATIONS

The MQ-7 Gas Sensor Module is ideal for carbon monoxide leak detection, home and office safety systems, gas alarm devices, smart IoT-based gas detection systems, robotics and automation projects, industrial CO monitoring, as well as school and engineering laboratory experiments.

WHY CHOOSE THE MQ-7 MODULE

The MQ-7 is specially optimized for carbon monoxide detection, offering excellent sensitivity, long-term stability, and reliable performance. Its ease of integration, adjustable sensitivity, and robust design make it a dependable choice for designers, hobbyists, and engineers developing gas monitoring and safety systems.