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int sensorValue;
int pin8 = 8;
void setup()
{
  Serial.begin(9600);
  pinMode(pin8, OUTPUT);
  
  }

  void loop()
  {
    sensorValue = analogRead(0); // read analog input pin 0
    Serial.print(sensorValue, DEC); //prints the value read
    Serial.println("ppm");
    if (sensorValue > 500) {
      //Activate digital output pin 8 - the LED will light up
      digitalWrite(pin8, HIGH);
    }
    else
    {
      // Deactivate digital output pin 8 - the LED will not light up 
      digitalWrite(pin8, LOW);
      
    }
    delay(50);
    
}