Published February 2, 2021 © Apache-2.0

Smart Trolley Using RFID And Arduino Nano

How to make Smart Trolley Using RFID And Arduino Nano

IntermediateFull instructions provided1 hour18,356

Things used in this project

Hardware components

Arduino Nano R3

SparkFun RFID Reader Breakout

Buzzer

Software apps and online services

Arduino IDE

Story

We all have waited in a queue for payment in shopping malls and other places, its very tiring and wastes a lot of time in the billing process. Today we will build a smart shopping cart with an automatic billing system that not only reduces the waiting time but also makes the process very smooth and easy.

Here we use RFID cards and RFID readers with Arduino to build the Smart Shopping Cart project. The cart information and total value will be displayed on the webpage as well as on LCD.

EM18 RFID Reader and it's Working

RFID stands for Radio-frequency identification. It refers to a technology, where digital data is encoded in RFID tags and decoded by an RFID reader using radio waves. RFID is similar to barcoding in which data from a tag is decoded by an RFID reader device. The RFID technology is used in various applications like inventory management, attendance system, door lock system, access to restricted areas, etc.

EM18 Reader is a very popular RFID module that can read the ID information stored in the RFID tags. The RFID tags stores a 12 digit unique number which can be decoded by an EM18 reader module, when the tag comes in a range of the Reader. This module has an inbuilt antenna that operates at a frequency of 125 kHz and a 5v DC power supply is required to power it up.

It gives a serial data output and has a range of 8-12cm. The serial communication parameters are 8 data bits, 1 stop bit and 9600 baud rate.

EM18 RFID Reader Features:

Operating voltage: +4.5V to +5.5V DC
Current consumption:50mA
Operating frequency:125KHZ
Operating temperature: 0-80 degree C
Communication Baud Rate:9600
Reading distance: 8-12 cm
Antenna: Inbuilt

EM18 RFID Reader Pinout:

EM18 RFID Reader Pin description:

VCC: 4.5- 5V DC voltage input

GND: Ground pin

Buzzer: Buzzer or LED pin

TX: Serial data Transmitter pin of EM18 for RS232 (Output)

SEL: This must be HIGH for using RS232 (LOW if using WEIGAND)

Data 0: WEIGAND data 0

Data 1: WEIGAND data 1

IoT based Smart Shopping Cart Circuit Diagram

Complete circuit diagram for RFID based Intelligent Shopping Trolley System is given below:

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Code

Code

#include <Arduino.h>

#include <LiquidCrystal_I2C.h>
#include <Wire.h>


LiquidCrystal_I2C lcd(0x27, 16, 2);

char input[12];
int count = 0;
int a;
int p1=0,p2=0,p3=0,p4=0; 
int c1=0,c2=0,c3=0,c4=0;

double total = 0;
int count_prod = 0;


void setup ()
{
//  Pin direction
   
  pinMode(3, INPUT_PULLUP);   //Push Switch
  pinMode(4, OUTPUT);         //RED LED
  pinMode(5, OUTPUT);         //BUZZER
  pinMode(6, OUTPUT);         //GREEN LED

// Initialization
  Serial.begin(9600);

  
//  lcd.begin();
 lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print(" AUTOMATIC BILL");
  delay (2000);
  lcd.setCursor(0, 1);
  lcd.print("  SHOPPING CART       ");
  delay (2000);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("   WELCOME TO ");
  lcd.setCursor(0, 1); 
  lcd.print("JUSTDOELECTRONIC");

}
 void loop()
{
  
 count = 0;
    while (Serial.available() && count < 12)
    {
      input[count] = Serial.read();
      delay(5);
    }
      int a=digitalRead(3);
      
     if ((strncmp(input, "4000350ABAC5", 12) == 0) && (a == 1))
      {
       
        lcd.setCursor(0, 0);
        lcd.print("Butter Added       ");
        lcd.setCursor(0, 1);
        lcd.print("Price(Rm):4.00      ");
        digitalWrite(4,HIGH);
        digitalWrite(5,LOW);
        digitalWrite(6,HIGH);
        delay(2000);
        total = total + 4.00;
        count_prod++;
        digitalWrite(4,LOW);
        digitalWrite(5,HIGH);
        digitalWrite(6,LOW);
        
      }


      else if ((strncmp(input, "4000350ABAC5", 12) == 0) && (a == 0))
      {
        if(p1>0)
        {
        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Butter Removed!!!        "); 
        digitalWrite(4,HIGH);
        digitalWrite(5,LOW);
        digitalWrite(6,HIGH);
        delay(2000);
        total = total - 4.00;
        lcd.clear();
       digitalWrite(4,LOW);
        digitalWrite(5,HIGH);
        digitalWrite(6,LOW);
        }
        else
        {
        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Not in cart!!!        ");
        digitalWrite(4,HIGH);
        digitalWrite(5,LOW);
        digitalWrite(6,HIGH);
        delay(2000);
        digitalWrite(4,LOW);
        digitalWrite(5,HIGH);
        digitalWrite(6,LOW);
        lcd.clear();
        }
      }


       if ((strncmp(input, "4000351B7B15", 12) == 0) && (a == 1))
      {
        lcd.setCursor(0, 0);
        lcd.print("Milk Added       ");
        lcd.setCursor(0, 1);
        lcd.print("Price(Rm):6.00      ");
       
        digitalWrite(6,HIGH);
        delay(2000);
        total = total + 6.00;
        count_prod++;
        digitalWrite(4,LOW);
        digitalWrite(5,HIGH);
        digitalWrite(6,LOW);
        
      }


      else if ((strncmp(input, "4000351B7B15", 12) == 0) && (a == 0))
      {
        if(p2>0)
        {
        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Butter Removed!!!        ");
         digitalWrite(4,HIGH);
        digitalWrite(5,LOW);
        digitalWrite(6,HIGH);
        delay(2000);
     
        lcd.clear();
        digitalWrite(4,LOW);
        digitalWrite(5,HIGH);
        digitalWrite(6,LOW);
        }
        else
        {
        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Not in cart!!!        ");
         digitalWrite(4,HIGH);
        digitalWrite(5,LOW);
        digitalWrite(6,HIGH);
        delay(2000);
        digitalWrite(4,LOW);
        digitalWrite(5,HIGH);
        digitalWrite(6,LOW);
        lcd.clear();
        }
      }

    if ((strncmp(input, "4000355181A5", 12) == 0) && (a == 1))
      {

     lcd.clear();  
     lcd.setCursor(0, 0);
     lcd.print("Total Price :-");
        
     lcd.setCursor(0, 1);
     lcd.print(total);

     delay(5000);
     lcd.clear();
   lcd.setCursor(0, 0);
  lcd.print("  THANKS FOR  ");
   lcd.setCursor(0, 1);
  lcd.print("   VISITING ");
     
      }     

}