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Iot Based Smart Shopping Cart Using Rfid Reader

About the project

I have developed a lot based smart shopping cart using RFID reader.In this project, I used nodemcu esp8266 microcontroller,LCD display,em-18 reader module, and Arduino IDE. When people go shopping they have to wait in a queue for the billing process. This solution allows people can make a bill for their purchases by themselves.

Project info

Difficulty: Moderate

Platforms: Arduino, NodeMCU, Espressif, JLCPCB, KiCad

Estimated time: 2 weeks

License: GNU General Public License, version 3 or later (GPL3+)

Items used in this project

Hardware components

	NodeMCU v2-Lua based ESP8266 development kit IT IS USED AS THE CONTROLLER OF THE PROJECT	x 1
	I2C 1602 Arduino LCD Screen IT IS USED TO DISPLAY THE COST PER ITEM,NAME OF THE ITEM AND TOTAL COST OF PURCHASE	x 1
	LED Tactile Button Breakout IT IS USED TO REMOVE THE ITEM IN THE CART	x 1
	LED - Basic Red 3mm IT IS USED TO INDICATE THAT THE RFID TAG IS READED OR NOT	x 1
	RFID Reader USB Tag Sampler Kit IT IS USED TO READ THE SPECIFIED VALUE OF THE GIVEN RFID TAG	x 1

Software apps and online services

	DIPTRACE USED FOR SCHEMATIC AND PCB LAYOUT DESIGNING
	ARDUINO IDE CODING, COMPLING AND DUMPING
	GOOGLE SHEETS CLOUD

Hand tools and fabrication machines

	SOILDERING MACHINE	x 1
	tin-lead alloys	x 1
	DESOLDERING PUMP	x 1

Story

Schematics, diagrams and documents

Iot Based Smart Shopping Cart Using Rfid Reader

CAD, enclosures and custom parts

Iot Based Smart Shopping Cart Using Rfid Reader

Code

Iot Based Smart Shopping Cart Using Rfid Reader

#include <ESP8266WiFi.h>
#include <WiFiClientSecure.h>

#define ON_Board_LED D0  

const char* ssid = "ranjith"; 
const char* password = "12345678"; 



const char* host = "script.google.com";
const int httpsPort = 443;

WiFiClientSecure client; 

String GAS_ID = "AKfycbwQZGg_qnntgCrWWozRwaHxaESIRCF9dPJPR3OLJ8YPfbMbbK4"; 
String item;
int quantity, ratepi;

int count = 0;
char input[12];
int a = 0;
int rate = 0;
int total = 0;
int led = 2;
int sw = 0;
int q=0,f=0,b=0,n=0;
#include<LiquidCrystal_I2C.h>
#include<Wire.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup()
{
  pinMode(led, OUTPUT);
  pinMode(sw, INPUT);
  Serial.begin(9600);
  Wire.begin(D2, D1);
  lcd.init();
  lcd.backlight();           
  lcd.home();
  lcd.begin(16, 2);
  lcd.setCursor(0, 0);
  lcd.print("   WELCOME TO   ");
  lcd.setCursor(0, 1);
  lcd.print("    SHOPPING  ");

  WiFi.begin(ssid, password);
  Serial.println("");

  pinMode(ON_Board_LED, OUTPUT); 
  digitalWrite(ON_Board_LED, HIGH);

  
  Serial.print("Connecting");
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
   
    digitalWrite(ON_Board_LED, LOW);
    delay(25);
    digitalWrite(ON_Board_LED, HIGH);
    delay(25);
    
  }
  
  digitalWrite(ON_Board_LED, HIGH);
  Serial.println("");
  Serial.print("Successfully connected to : ");
  Serial.println(ssid);
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());
  Serial.println();
  

  client.setInsecure();
}

void loop()
{
  if (Serial.available())
  {
    count = 0;
    Serial.println("Serial Available");
    while (Serial.available() && count < 12)
    {
      input[count] = Serial.read();
      count++;
      delay(5);     
    }

    
    if (count == 12)
    {
      a = digitalRead(sw);
      if ((strncmp(input, "53006D8E47F7", 12) == 0) && (a == 1))
      {
        {
          lcd.clear();
          lcd.setCursor(0, 0);
          lcd.print("TOMOTO ADDED");
          lcd.setCursor(0, 1);
          lcd.print("PRICE(Rs):100");
          Serial.println("TOMOTO 1kg =RS 100 ADDED");
        }
        {
          digitalWrite(led, HIGH);
          delay(200);
          digitalWrite(led, LOW);
          rate = rate + 100;
        }
        item = "TOMOTO 1kg ADDED";
        quantity = q+1;
        ratepi = 100;
      }
      if ((strncmp(input, "53006D8E47F7", 12) == 0) && (a == 0))
      {
        {
          lcd.clear();
          lcd.setCursor(0, 0);
          lcd.print("TOMOTO REMOVED");
          lcd.setCursor(0, 1);
          lcd.print("PRICE(Rs):-100");
          Serial.println("TOMOTO 1kg =RS 100 REMOVED");
        }
        {
          digitalWrite(led, HIGH);
          delay(200);
          digitalWrite(led, LOW);
          rate = rate - 100;
        }
        item = "TOMOTO 1kg REMOVED";
        quantity = q-1;
        ratepi = -100;
      }
      if ((strncmp(input, "53006D7C591B", 12) == 0) && (a == 1))
      {
        {
          lcd.clear();
          lcd.setCursor(0, 0);
          lcd.print("APPLE ADDED");
          lcd.setCursor(0, 1);
          lcd.print("Price(Rs):200         ");
          Serial.println("APPLE 1kg =RS 200 ADDED");
        }
        {
          digitalWrite(led, HIGH);
          delay(200);
          digitalWrite(led, LOW);
          rate = rate + 200;
        }
        item = "APPLE 1kg ADDED";
        quantity = f+1;
        ratepi = 200;
      }
      if ((strncmp(input, "53006D7C591B", 12) == 0) && (a == 0))
      {
        {
          lcd.clear();
          lcd.setCursor(0, 0);
          lcd.print("APPLE REMOVED");
          lcd.setCursor(0, 1);
          lcd.print("PRICE(Rs):-200");
          Serial.println("APPLE 1kg =RS 200 REMOVED");
        }
        {
          digitalWrite(led, HIGH);
          delay(200);
          digitalWrite(led, LOW);
          rate = rate - 200;
        }
        item = "APPLE 1kg REMOVED";
        quantity = f-1;
        ratepi = -200;
      }
      if ((strncmp(input, "53006D80D769", 12) == 0) && (a == 1))
      {
        {
          lcd.clear();
          lcd.setCursor(0, 0);
          lcd.print("BISCUIT ADDED");
          lcd.setCursor(0, 1);
          lcd.print("PRICE(Rs):30");
          Serial.println("BISCUT 1PKT =RS 30 ADDED");
        }
        {
          digitalWrite(led, HIGH);
          delay(200);
          digitalWrite(led, LOW);
          rate = rate + 30;
        }
        item = "BISCUIT 1PKT 30 ADDED";
        quantity = b+1;
        ratepi = 30;
      }
      if ((strncmp(input, "53006D80D769", 12) == 0) && (a == 0))
      {
        {
          lcd.clear();
          lcd.setCursor(0, 0);
          lcd.print("BISCUIT REMOVED");
          lcd.setCursor(0, 1);
          lcd.print("PRICE(Rs):-30");
          Serial.println("BISCUT 1PKT =RS 30 REMOVED");
        }
        {
          digitalWrite(led, HIGH);
          delay(200);
          digitalWrite(led, LOW);
          rate = rate - 30;
        }
        item = "BISCUT 1PKT REMOVED";
        quantity = b-1;
        ratepi = -30;
      }
      if ((strncmp(input, "53006D501A74", 12) == 0) && (a == 1))
      {
        {
          lcd.clear();
          lcd.setCursor(0, 0);
          lcd.print("NOODLES PKT ADDED");
          lcd.setCursor(0, 1);
          lcd.print("PRICE(Rs):80");
          Serial.println("NOODLES 1PKT =RS80 ADDED");
        }
        {
          digitalWrite(led, HIGH);
          delay(200);
          digitalWrite(led, LOW);
          rate = rate + 80;
        }
        item = "NOODLES 1PKT ADDED";
        quantity = n+1;
        ratepi = 80;
      }
      if ((strncmp(input, "53006D501A74", 12) == 0) && (a == 0))
      {
        {
          lcd.clear();
          lcd.setCursor(0, 0);
          lcd.print("NOODLES REMOVED");
          lcd.setCursor(0, 1);
          lcd.print("PRICE(Rs):-80");
          Serial.println("NOODLES 1PKT =RS80 REMOVED");
        }
        {
          digitalWrite(led, HIGH);
          delay(200);
          digitalWrite(led, LOW);
          rate = rate - 80;
        }
        item = "NOODLES 1PKT REMOVED";
        quantity = n-1;
        ratepi = -80;
      }
      if ((strncmp(input, "5300A79C1078", 12) == 0) && (a == 1))
      {
        {
          total = rate;
          lcd.clear();
          lcd.setCursor(0, 0);
          lcd.print("TOTAL AMOUNT:");
          lcd.setCursor(10, 1);
          lcd.print(total);
          Serial.println(total);
        }
        {
          digitalWrite(led, HIGH);
          delay(200);
          digitalWrite(led, LOW);          
          Serial.println("THANKYOU FOR SHOPPING");
        }
        item=("total purchesed cost");
        quantity=q+f+b+n;
        ratepi=rate;
      }
      if ((strncmp(input, "5300A79C1078", 12) == 0) && (a == 0))
      {
        {
          lcd.clear();
          lcd.setCursor(0, 0);
          lcd.print("CART IS EMPTY");
          lcd.setCursor(0, 1);
          lcd.print("WELCOME FOR SHOPPING");
          rate = 0;
          Serial.println(rate);
        }
        {
          digitalWrite(led, HIGH);
          delay(200);
          digitalWrite(led, LOW);
          Serial.println("WELCOME FOR SHOPPING");
        }
      }

    }

    String quantity_string = String(quantity);
    String ratepi_string = String(ratepi);
    Serial.print("item : ");
    Serial.print(item);

    Serial.print("Quantity : ");
    Serial.print(quantity);

    Serial.print("ratepi : ");
    Serial.print(ratepi);


    sendData(item, quantity_string, ratepi_string);
  }
}



void sendData(String item, String quantity_string, String ratepi_string) {
  Serial.println("==========");
  Serial.print("connecting to ");
  Serial.println(host);

 
  if (!client.connect(host, httpsPort)) {
    Serial.println("connection failed");
    return;
  }
  

 
    String url = "/macros/bitsathy.ac.in/s/" + GAS_ID + "/exec?item=" + item + "&quantity=" + quantity_string + "&ratepi=" + ratepi_string;
  Serial.print("requesting URL: ");
  Serial.println(url);

  client.print(String("GET ") + url + " HTTP/1.1\r\n" +
               "Host: " + host + "\r\n" +
               "User-Agent: BuildFailureDetectorESP8266\r\n" +
               "Connection: close\r\n\r\n");

  Serial.println("request sent");
  

 
  while (client.connected()) {
    String line = client.readStringUntil('\n');
    if (line == "\r") {
      Serial.println("headers received");
      break;
    }
  }
  String line = client.readStringUntil('\n');
  if (line.startsWith("{\"state\":\"success\"")) {
    Serial.println("esp8266/Arduino CI successfull!");
  } else {
    Serial.println("esp8266/Arduino CI has failed");
  }
  Serial.print("reply was : ");
  Serial.println(line);
  Serial.println("closing connection");
  Serial.println("==========");
  Serial.println();
 
}

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Iot Based Smart Shopping Cart Using Rfid Reader

About the project

Project info