For this project we need an MQ2 Gas Sensor, an Arduino Uno r3 board, and jumper wires. This project will detect gas concentration and output a value of low, medium, or high.
Code:
const int mq2Analog = A0; // Connect OUT to A0
void setup() {
Serial.begin(9600);
}
void loop() {
int sensorValue = analogRead(mq2Analog);
float voltage = sensorValue * (5.0 / 1023.0);
Serial.print("Analog Value: ");
Serial.print(sensorValue);
Serial.print(" | Voltage: ");
Serial.print(voltage);
Serial.print(" V | Gas Level: ");
// Simple thresholds for gas concentration
if (sensorValue < 200) {
Serial.println("Low");
} else if (sensorValue < 600) {
Serial.println("Medium");
} else {
Serial.println("High");
}
delay(1000);
}