/*This program allows to meassure density of differents gasses in air*/

int led = 13; //Led to Arduino pin 13
int digitalGas = 4;
int analogGas = A0; //GAS sensor output pin to Arduino analog A0 pin


void setup()
{
  Serial.begin(9600); //Initialize serial port - 9600 bps
  pinMode(analogGas, INPUT);
  pinMode(digitalGas, INPUT);
  pinMode(led, OUTPUT);
}

void loop()
{
  //Turn on led if detects alcohol.
  if (digitalRead(digitalGas) == LOW) {
    digitalWrite(led, HIGH);
  }
  else {
    digitalWrite(led, LOW);
  }
  Serial.println(analogRead(analogGas));
  delay(1000); // Print value every 1 sec.
}