// I tested this 5/14/25, it works irl!!!!

#define MQ2pin 25 // or 26, either is fine
#define Buzzer 13 // can be any

float sensorValue;  //variable to store sensor value
int dangerValue = 800; // arbitrary
          
void setup() {
    Serial.begin(9600);  // sets the serial port to 9600
    Serial.println("MQ2 warming up!");
    pinMode(Buzzer, OUTPUT);
    delay(20000);  // allow the MQ2 to warm up
}
          
void loop() {
    sensorValue = analogRead(MQ2pin);  // read analog input pin 0
          
    Serial.print("Sensor Value: ");
    Serial.println(sensorValue);
    if (sensorValue >= dangerValue ) {
      digitalWrite(Buzzer, HIGH); // buzzer on 
      delay(20000); // buzzer on for 20 s to allow the miner to react
      digitalWrite(Buzzer, LOW); // buzzer off 
    }
          
    delay(2000);  // wait 2s for next reading
}