MQ-7 Carbon Monoxide Sensor Module for Arduino DIY

MQ-7 Carbon Monoxide Gas Sensor Module for Arduino and DIY Projects

The MQ-7 Carbon Monoxide Gas Sensor Module is designed for reliable detection of CO gas concentration in the air. It is widely used in Arduino projects, Raspberry Pi integrations, and other DIY electronics applications where gas safety is important. This sensor module provides both digital (TTL) and analog outputs, making it easy to connect with microcontrollers and development boards. Whether you are a student working on a science project, a hobbyist experimenting with sensors, or an engineer developing a safety device, the MQ-7 module offers high sensitivity, long service life, and stable performance. At Bigyan Project (বিজ্ঞান প্রজেক্ট), we bring you original modules to ensure quality and reliability in your electronics projects.

Product Specifications

Features

• High sensitivity to Carbon Monoxide gas
• Wide detection range from 10 ppm to 1000 ppm CO
• Supports both analog and digital outputs
• TTL output with indicator LED for easy testing
• Adjustable load resistance for flexible calibration
• Stable performance and long operating life
• Compact module with mounting holes for easy placement
• Compatible with Arduino, Raspberry Pi, and other microcontrollers

Applications / Use Cases

• Arduino and DIY electronics projects
• Portable carbon monoxide detectors
• Indoor air quality monitoring systems
• Automobile exhaust detection
• Gas leak alarm systems
• Educational science experiments for students
• Smart home safety devices

User Guide / How to Use

Using the MQ-7 module is simple. Connect the VCC pin to a 5V power supply and GND to ground. The DO (digital output) pin can be connected directly to a microcontroller input pin to detect threshold levels. The AO (analog output) pin provides proportional voltage according to gas concentration, which can be read by an ADC pin on Arduino or Raspberry Pi. The onboard potentiometer allows you to adjust sensitivity levels. When CO gas is detected above the threshold, the digital output goes LOW and the onboard LED lights up. For better accuracy, it is recommended to preheat the sensor for a few minutes before taking readings.

Frequently Asked Questions (FAQs)

• Q: What gas does the MQ-7 detect?
  A: The MQ-7 sensor is designed to detect Carbon Monoxide (CO) gas only.
• Q: Can I use the MQ-7 with Arduino Uno?
  A: Yes, the module is fully compatible with Arduino Uno, Nano, Mega, and other boards.
• Q: What is the detection range of this sensor?
  A: The MQ-7 can detect CO gas in the range of 10 ppm to 1000 ppm.
• Q: Does it work with Raspberry Pi?
  A: Yes, both analog and digital outputs can be connected to Raspberry Pi with an ADC module.
• Q: Is calibration required?
  A: Yes, adjusting the onboard potentiometer ensures more accurate detection results.

Challenges and Considerations

• Requires initial preheating before stable readings
• Sensitivity can vary with temperature and humidity
• Not suitable for detecting gases other than Carbon Monoxide
• Calibration may be required for precise measurement

Compatibility

• Arduino Uno, Nano, Mega, Leonardo
• ESP8266 and ESP32 development boards
• Raspberry Pi with ADC interface
• STM32 and PIC microcontrollers
• DIY IoT projects and smart devices

Future Enhancement Options

• Integration with WiFi (ESP8266 or ESP32) for IoT monitoring
• Connection to GSM modules for SMS alerts
• Data logging with SD card modules
• Use with LCD or OLED displays for real-time readings
• Smart home automation with CO detection alerts

Benefits

• Reliable and accurate CO gas detection
• Easy to integrate with Arduino and DIY projects
• Low-cost solution for gas monitoring
• Long service life with stable performance
• Available with trusted source Bigyan Project (বিজ্ঞান প্রজেক্ট)

Conclusion

The MQ-7 Carbon Monoxide Gas Sensor Module is a powerful and affordable solution for detecting CO gas in both DIY and professional projects. Its wide detection range, dual output options, and high sensitivity make it an excellent choice for students, hobbyists, and engineers alike. Whether you are building a safety device, a science project, or an IoT-based monitoring system, this module delivers reliable performance. For authentic and high-quality MQ-7 sensor modules, trust Bigyan Project (বিজ্ঞান প্রজেক্ট) – your partner in electronics and science innovation.