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
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.