#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
#include <Servo.h>
Servo myservo;  
int pos = 0;
int rate = 0;
float discount = 0;
int tax = 0;
int billTotal = 0;
int productCode = 0;
void setup() {
    myservo.attach(6);
      
pinMode(2,INPUT);
pinMode(3,INPUT);
pinMode(4,INPUT);
pinMode(5,INPUT);
  Wire.begin();
   lcd.init();
  lcd.backlight();  
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Smart Shopping ");
  delay(200);
lcd.setCursor(0,1);
  lcd.print("Trolley");
  delay(2000);
  lcd.clear();
  delay(1000);
  myservo.write(pos);
  delay(300);
}

void loop() {
  if(digitalRead(2) == HIGH)
{
  productCode = 1;            //Special value / product code of every different product
}
if(digitalRead(3) == HIGH)
{
  productCode = 2;
}
if(digitalRead(4) == HIGH)
{
  productCode = 3;
}

if(productCode == 0)
{
    lcd.setCursor(0,0);
  lcd.print("Scan New Product");
  delay(1000);
}
if(productCode == 1)
{
    lcd.setCursor(0,0);
  lcd.print("Product = Biscuits");
  delay(1000);
  rate = 10;                 //example rate of biscuit
  discount = 2;              // example discount in percent
  tax = 12;                 //Example tax
  billTotal = billTotal + rate;
}
if(productCode == 2)
{
    lcd.setCursor(0,0);
  lcd.print("Product = Any Grocery 1");
  delay(1000);
  rate = 40;                 //example rate of biscuit
  discount = 8;              // example discount in percent
  tax = 5;                 //Example tax
  billTotal = billTotal + rate; //total new bill amount ater scanning of new product
}
if(productCode == 3)
{
    lcd.setCursor(0,0);
  lcd.print("Product = any product 2");
  delay(1000);
  rate = 50;                 //example rate of biscuit
  discount = 20;              // example discount in percent
  tax = 18;                 //Example tax
  billTotal = billTotal + rate; //total new bill amount ater scanning of new product
}

lcd.setCursor(0,1);
  lcd.print("Total Bill = ");
    lcd.print(billTotal);
      lcd.print("Rs ");
  delay(200);
lcd.setCursor(0,2);
  lcd.print("Discount= ");
    lcd.print(discount);
      lcd.print("% ");
  lcd.setCursor(10,2);
  lcd.print("Tax= ");
    lcd.print(tax);
      lcd.print(" %");
  lcd.setCursor(0,3);
  lcd.print("Expiry = 03/04/2026 ");
  rate = 0;               
  discount = 0;              
  tax = 0;

  if(digitalRead(5) == HIGH)
  {
      for (pos = 0; pos <= 90; pos += 1) 
      { 
    myservo.write(pos);            
    delay(3);
  }
  delay(10000);
   myservo.write(pos); 
   delay(200);
  }
}