#include <SoftwareSerial.h>  
#include <LiquidCrystal_I2C.h>   
//BASIC CONNECTIONS
#define sensor 5
#define en1 6
#define en2  7                                                                                                                          
#define gsmTX 3
#define  gsmRX 2
LiquidCrystal_I2C lcd(0x27,20,4);
SoftwareSerial mySerial(2, 3);
bool state;

void setup()
{
  Serial.begin(9600);
  delay(500);
  mySerial.begin(9600); // RX, TX, 
  lcd.init();                  
  lcd.backlight();
  loadingdisplay();
  Serial.begin(115200);                  
  pinMode(en1,OUTPUT);
  pinMode(en2,OUTPUT);
  pinMode(sensor,INPUT);
  lcd.clear();
  loadingdisplay();
}

void loadingdisplay()
{
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("VEHICLE STARTED"); 
  lcd.setCursor(0,1);
  lcd.print("WARMING UP....."); 
  delay(2000);
 }

 
void move(bool mode)
{
  if(mode)
  {
      digitalWrite(en1,HIGH);
      digitalWrite(en2,LOW);
  }
  else
  {
     digitalWrite(en1,LOW);
    digitalWrite(en2,LOW);
  }
}

void homedisplay()
{
  lcd.setCursor(0,0);
  lcd.print("SAFE TO DRIVE"); 
}

void alertdisplay()
{
  lcd.setCursor(0,0);
  lcd.print("--->!ALEART!<---"); 
  lcd.setCursor(0,1);
  lcd.print("ALCOHOL DETECTED"); 
}

void loop()
{
 if(digitalRead(sensor))
 { 
  alertdisplay();
  move(0);
 }
else
 {
  homedisplay();
  move(1);   
 }
}