MQ-7 Carbon Monoxide Gas Sensor Module

The MQ-7 Carbon Monoxide Gas Sensor Module is a high-precision gas detection device designed to measure carbon monoxide (CO) levels in the air. Using a SnO₂ semiconductor gas-sensitive layer, the MQ-7 provides excellent sensitivity and stability, responding efficiently to CO concentrations from 20 ppm to 2000 ppm.

The sensor operates at 5V DC and includes both analog (AO) and digital (DO) outputs, making it fully compatible with Arduino, ESP8266, ESP32, and Raspberry Pi. It features an LM393 comparator IC and an adjustable potentiometer to set a detection threshold for the digital output, enabling easy integration into alarm or monitoring systems.

The MQ-7 is widely used in home safety alarms, vehicle emission detectors, industrial CO monitoring, and air quality measurement projects. It uses a unique heating cycle method for accurate detection — alternating between high and low heating voltages to ensure precise CO measurement while minimizing interference from other gases.

With fast response, reliable performance, and long service life, the MQ-7 module is ideal for students, engineers, and makers developing IoT-based air monitoring systems or smart home safety devices.

Get your MQ-7 Carbon Monoxide Gas Sensor Module from eleberric.com, Sri Lanka’s trusted store for Arduino sensors, IoT modules, and embedded electronic components.

Specification

• Model: MQ-7

• Operating Voltage: 5V DC

• Sensor Type: Semiconductor (SnO₂)

• Detection Range: 20 ppm – 2000 ppm (CO)

• Output: Analog (AO) and Digital (DO)

• Sensitivity: High to Carbon Monoxide (CO)

• Preheat Time: ~60 seconds

• Operating Temperature: -10°C to +50°C

• Dimensions: Approx. 32mm × 22mm × 27mm

• Weight: Approx. 25g

Key Features

• High sensitivity to carbon monoxide (CO)

• Dual output: Analog and Digital

• Adjustable detection threshold with potentiometer

• LM393 comparator for precise digital output

• Built-in power and signal indicator LEDs

• Long life and stable operation

• Compatible with Arduino, ESP8266, ESP32, and Raspberry Pi

Applications

• Carbon monoxide leak detection systems

• Home and industrial CO monitoring

• Smart air quality sensing devices

• IoT-based environmental monitoring projects

• Vehicle exhaust detection

• Safety alarms and embedded control systems