Drunk Driver Detector using Arduino & MQ3 Gas Sensor

Drunk_Driver_Detector.ino

//#include <LiquidCrystal.h>          For using 12x2 lcd array
//LiquidCrystal lcd(12,11,6,5,4,3,2);

const int AOUTpin=0;//the AOUT pin of the alcohol sensor goes into analog pin A0 of the arduino
const int DOUTpin=8;//the DOUT pin of the alcohol sensor goes into digital pin D8 of the arduino
const int ledPin=13;//the anode of the LED connects to digital pin D13 of the arduino
const int motorPin=7;

int limit;
int value;

void setup() {
Serial.begin(9600);
pinMode(DOUTpin, INPUT);//sets the pin as an input to the arduino
pinMode(ledPin, OUTPUT);//sets the pin as an output of the arduino
pinMode(motorPin,OUTPUT);
  digitalWrite(motorPin, HIGH);
//  lcd.begin(16,2);
//  lcd.clear();
//  analogWrite(9,100);
//  analogWrite(6,0);
}

void loop()
{
  value=analogRead(AOUTpin);//reads the analaog value from the alcohol sensor's AOUT pin
  Serial.print("Alcohol value : ");
  Serial.print(value);
  Serial.print("~~");
  if(value<300)
  {
      Serial.println("You are sober.");
  }
/*if (value>=200 && value<280)
  {
      Serial.print("Alcohol detected");
  }*/
  if (value>=301 && value<400)
  {
      Serial.println("You are sober.");
  }
  if (value>=401 && value<800)
  {
      Serial.println("Serious Booze here! ");
  }
  if(value>=800)//510
  {
     digitalWrite(ledPin, HIGH); 
     Serial.println("You are drunk!");
 //    lcd.print(value);
     digitalWrite(motorPin, LOW);
  }
  else
  {
    digitalWrite(motorPin, HIGH);
    digitalWrite(ledPin, LOW);
  }

  delay (500);
}