MQ-7 Gas Sensor Module For Carbon Monoxide Detector Module

MQ-7 Gas Sensor Module 

Overview

The MQ-7 Gas Sensor Module is specifically designed to detect Carbon Monoxide (CO), a toxic and odorless gas.

Commonly used in:

• Home safety systems

• Car exhaust monitoring

• Industrial environments

• IoT gas detection projects

Working Principle

• Uses SnO (Tin Dioxide) sensing layer

• In clean air low conductivity

• In presence of CO conductivity increases

The sensor converts this into an analog voltage signal

Special feature:

• Uses dual heating cycle

  • High temp (~5V) cleans sensor

    MQ-7 CO GAS SENSOR Detects: Carbon Monoxide Voltage: 5V Range: 202000 ppm Output: Analog + Digital Type: Toxic gas sensor Dual heating cycle r

  • Output:

    • Analog (CO concentration level)

    • Digital (threshold detection)

     

  • Heater Current: ~150 mA

  • Operating Temperature: -10C to 50C

   

  Key Features

  • High sensitivity to Carbon Monoxide

  • Fast response time

  • Easy to interface

  • Low cost

  • Adjustable sensitivity (potentiometer)

   

  Applications

  • CO leakage alarm systems

  • Vehicle exhaust monitoring

  • Smart home safety devices

  • Industrial gas detection

  • IoT environmental monitoring

   

  Interfacing

  Compatible with:

  • Ael

  • DO trigger alarm

   

  Important Notes

  • Requires preheating (2448 hours)

  • Needs heater voltage cycling for accuracy

  • Not highly selective (may respond to other gases)

  • High power consumption

   

  Safety tip:

  Carbon monoxide is deadly'always use certified detectors for real-life safety systems

  MQ-7 vs Other MQ Sensors

  Pro Tip

  For a CO safety project:

  • MQ-7 + Buzzer