Objective
This experiment uses the MQ-7 gas sensor to detect the presence of carbon monoxide (CO) gas.
Required Components
- MQ-7 Gas Sensor
- Arduino Board (e.g., Arduino Uno)
- Jumper wires
- Breadboard
Working Principle
The MQ-7 sensor detects carbon monoxide by measuring changes in resistance in the presence of CO.
Circuit Diagram
Arduino Code
/*
* Gas Leak Detection with MQ-7
* This code reads the carbon monoxide concentration from the MQ-7 sensor.
*/
const int mq7Pin = A0; // MQ-7 sensor connected to analog pin A0
int sensorValue = 0;
void setup() {
Serial.begin(9600); // Initialize serial communication
}
void loop() {
sensorValue = analogRead(mq7Pin); // Read the sensor value
Serial.print("CO Concentration: ");
Serial.println(sensorValue);
delay(1000); // Wait for 1 second before the next reading
}
Results
The serial monitor will display the concentration of carbon monoxide detected by the sensor.
Applications
- Home gas leak detection systems
- Industrial safety systems
- Air quality monitoring
Conclusion
The MQ-7 gas sensor provides an effective way to detect carbon monoxide, making it useful in safety systems and air quality monitoring.