Introduction

The MQ-7 gas sensor is widely used for detecting carbon monoxide (CO). In this tutorial, you will learn how to integrate the MQ-7 sensor with an Arduino, create a circuit, and implement sample code to monitor air quality. This project is ideal for safety applications and IoT monitoring systems.

Materials Required

• Arduino Uno or compatible board
• MQ-7 gas sensor module
• Breadboard and jumper wires
• Power supply (5V)
• Resistors (as needed)
• Connecting cables

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Circuit Diagram

Below is the circuit diagram for connecting the MQ-7 sensor to an Arduino:

Arduino Code

                
// MQ-7 Sensor Example Code
int sensorPin = A0;  // MQ-7 connected to analog pin A0
void setup() {
    Serial.begin(9600);
}
void loop() {
    int sensorValue = analogRead(sensorPin);
    float voltage = sensorValue * (5.0 / 1023.0);
    Serial.println(voltage);
    delay(1000);
}
                
            

Applications

Use this setup to monitor air quality in real time, detect dangerous levels of carbon monoxide, or incorporate it into a smart home system for safety and alerts.