void setup()
{
  Serial.begin(9600); //Set serial baud rate to 9600 bps
  pinMode(LED_BUILTIN, OUTPUT);
}
void loop()
{
int val;
val=analogRead(0);//Read Gas value from analog 0
Serial.println(val);//Print the value to serial port
delay(100);
if (val>200)
{digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(100);                       // wait for a second
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(100);                       // wait for a second
}
else
{digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);                       // wait for a second
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);                       // wait for a second
}