void setup() {
  pinMode(2, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  int S=analogRead(A0);
  int A= (S/10.23);
  Serial.print("Xonadagai gaz miqdori");
  Serial.print(S);
  Serial.print("    ");
  Serial.print(A)
  if (A>10);
  {
    digitalWrite(led1, HIGH);
  }
  else 
  {
    digitalWrite(led1,0);
  }

}