Kutluhan Aktar
Published © CC BY

IoT AI-driven Smart Grocery Cart w/ Edge Impulse

Provide a checkout-free shopping experience letting customers create an online shopping list from products in their cart and pay via email.

ExpertFull instructions provided1,744

Things used in this project

Hardware components

PCBWay Custom PCB
PCBWay Custom PCB
×1
OpenMV Cam H7
×1
Beetle ESP32 - C3 (RISC-V Core Development Board)
DFRobot Beetle ESP32 - C3 (RISC-V Core Development Board)
×1
LattePanda 3 Delta 864
×1
ST7735 1.8'' Color TFT Display
×1
MFRC522 RFID Reader
×1
SparkFun COM-09032 Analog Joystick
×1
5mm Common Anode RGB LED
×1
Buzzer
Buzzer
×1
Creality Sermoon V1 3D Printer
×1
Creality Sonic Pad
×1
Creality CR-200B 3D Printer
×1
MicroSD Card (FAT32)
×1
RFID Key Tags
×1
DFRobot 8.9'' 1920x1200 IPS Touch Display
(Optional)
×1
DC Power Connector, Jack
DC Power Connector, Jack
×1
External Battery
×1
Jumper wires (generic)
Jumper wires (generic)
×1

Software apps and online services

Edge Impulse Studio
Edge Impulse Studio
OpenMV IDE
Arduino IDE
Arduino IDE
Twilio SendGrid Email API
KiCad
KiCad
Fusion 360
Autodesk Fusion 360
Ultimaker Cura
Visual Studio 2017
Microsoft Visual Studio 2017

Hand tools and fabrication machines

Soldering iron (generic)
Soldering iron (generic)
Hot glue gun (generic)
Hot glue gun (generic)

Story

Read more

Custom parts and enclosures

smart_grocery_cart_case_top.stl

smart_grocery_cart_case_bottom.stl

smart_grocery_cart_case_pin.stl

smart_grocery_cart_case_pin_end.stl

Edge Impulse Model (OpenMV Firmware)

Gerber Files

Fabrication Files

Schematics

PCB_1

PCB_2

PCB_3

PCB_4

PCB_5

PCB_6

PCB_7

Beetle ESP32-C3

OpenMV Cam H7

Code

smart_grocery_cart_data_collect.py

Python
# IoT AI-driven Smart Grocery Cart w/ Edge Impulse
#
# OpenMV Cam H7
#
# Provide a checkout-free shopping experience letting customers create an online shopping list
# from products in their cart and pay via email.
#
# By Kutluhan Aktar

import sensor, image, math, lcd
from time import sleep
from pyb import RTC, Pin, ADC, LED


# Initialize the camera sensor.
sensor.reset()
sensor.set_pixformat(sensor.RGB565) # or sensor.GRAYSCALE
sensor.set_framesize(sensor.QQVGA2) # Special 128x160 framesize for LCD Shield.

# Initialize the ST7735 1.8" color TFT screen.
lcd.init()

# Set the built-in RTC (real-time clock).
rtc = RTC()
rtc.datetime((2022, 12, 6, 5, 15, 35, 52, 0))

# RGB:
red = LED(1)
green = LED(2)
blue = LED(3)

# Joystick:
J_VRX = ADC(Pin('P6'))
J_SW = Pin("P9", Pin.IN, Pin.PULL_UP)

# Define the data holders.
j_x = 0
sw = 0

# Capture an image with the OpenMV Cam H7 as a sample.
def save_sample(name, color, leds):
    # Get the current date and time.
    date = rtc.datetime()
    date = ".{}_{}_{}_{}-{}-{}".format(date[0], date[1], date[2], date[4], date[5], date[6])
    # Take a picture with the given frame settings (160X160).
    sensor.set_framesize(sensor.B160X160)
    sample = sensor.snapshot()
    sleep(1)
    # Save the captured image.
    file_name = "/samples/" + name + date + ".jpg"
    sample.save(file_name, quality=20)
    adjustColor(leds)
    print("\nSample Saved: " + file_name + "\n")
    # Show a glimpse of the captured image on the ST7735 1.8" color TFT screen.
    sensor.set_framesize(sensor.QQVGA2)
    lcd_img = sensor.snapshot()
    lcd_img.draw_rectangle(0, 0, 128, 30, fill=1, color =(0,0,0))
    lcd_img.draw_string(int((128-16*len(name))/2), 3, name, color=color, scale=2)
    lcd_img.draw_rectangle(0, 130, 128, 160, fill=1, color =(0,0,0))
    lcd_img.draw_string(int((128-16*len("Saved!"))/2), 132, "Saved!", color=color, scale=2)
    lcd_img.draw_cross(64, 80, color=color, size=8, thickness=2)
    lcd.display(lcd_img)
    sleep(5)
    adjustColor((0,0,0))

def adjustColor(leds):
    if leds[0]: red.on()
    else: red.off()
    if leds[1]: green.on()
    else: green.off()
    if leds[2]: blue.on()
    else: blue.off()

def readJoystick():
    j_x = ((J_VRX.read() * 3.3) + 2047.5) / 4095
    j_x = math.ceil(j_x)
    sw = J_SW.value()
    return (j_x, sw)


while(True):
    # Display a real-time video stream on the ST7735 1.8" color TFT screen.
    sensor.set_framesize(sensor.QQVGA2)
    lcd_img = sensor.snapshot()
    lcd.display(lcd_img)

    # Read controls from the joystick.
    j_x, sw = readJoystick()

    # Save samples (images) distinguished by 'food' and 'drink' labels.
    if(j_x > 3):
        save_sample("Food", (255,0,255), (1,0,1))
    if(j_x < 2):
        save_sample("Drink", (0,255,255), (0,1,1))

smart_grocery_cart_run_model.py

Python
# IoT AI-driven Smart Grocery Cart w/ Edge Impulse
#
# OpenMV Cam H7
#
# Provide a checkout-free shopping experience letting customers create an online shopping list
# from products in their cart and pay via email.
#
# By Kutluhan Aktar

import sensor, image, math, lcd, tf
from time import sleep
from pyb import Pin, ADC, LED, UART
from product_list import products

# Initialize the camera sensor.
sensor.reset()
sensor.set_pixformat(sensor.RGB565) # or sensor.GRAYSCALE
sensor.set_framesize(sensor.QQVGA2) # Special 128x160 framesize for LCD Shield.

# Define the required parameters to run an inference with the Edge Impulse FOMO model.
net = None
labels = None
min_confidence = 0.7

# Include the Edge Impulse FOMO model converted to an OpenMV firmware.
# Then, print errors, if any.
try:
    labels, net = tf.load_builtin_model('trained')
except Exception as e:
    raise Exception(e)

# Initiate the integrated serial port on the OpenMV Cam H7.
uart = UART(3, 115200, timeout_char=1000)

# Initialize the ST7735 1.8" color TFT screen.
lcd.init()

# RGB:
red = LED(1)
green = LED(2)
blue = LED(3)

# Joystick:
J_VRX = ADC(Pin('P6'))
J_SW = Pin("P9", Pin.IN, Pin.PULL_UP)

# Define the data holders.
j_x = 0
sw = 0
cart_choice = "EMPTY"
detected_product = 0

def adjustColor(leds):
    if leds[0]: red.on()
    else: red.off()
    if leds[1]: green.on()
    else: green.off()
    if leds[2]: blue.on()
    else: blue.off()

def readJoystick():
    j_x = ((J_VRX.read() * 3.3) + 2047.5) / 4095
    j_x = math.ceil(j_x)
    sw = J_SW.value()
    return (j_x, sw)


while(True):
    menu_config = 0

    # Read controls from the joystick.
    j_x, sw = readJoystick()

    # Take a picture with the given frame settings.
    img = sensor.snapshot()
    lcd.display(img)

    # Change the table name on Beetle ESP32-C3 with the latest registered customer's table name in the database.
    if(sw == 0):
        query = "get_table"
        print("\nQuery: " + query + "\n")
        img.draw_rectangle(0, int(160/4), 128, int(160/2), fill=1, color =(0,0,255))
        img.draw_string(int((128-16*len("Query"))/2), int((160/2)-28), "Query", color=(255,255,255), scale=2)
        img.draw_string(int((128-16*len("Sent!"))/2), int((160/2)+8), "Sent!", color=(255,255,255), scale=2)
        lcd.display(img)
        uart.write(query)
        adjustColor((0,0,1))
        sleep(5)
        adjustColor((0,0,0))

    # Run an inference with the FOMO model to detect products.
    # Via the detect function, obtain all detected objects found in the recently captured image, split out per label (class).
    for i, detection_list in enumerate(net.detect(img, thresholds=[(math.ceil(min_confidence * 255), 255)])):
        # Exclude the class index 0 since it is the background class.
        if (i == 0): continue

        # If the Edge Impulse FOMO model predicted a label (class) successfully:
        if (len(detection_list) == 0): continue

        # Activate the selection (options) menu for adding or removing products to/from the database table.
        menu_config = 1

        # Obtain the detected product's label to retrieve its details saved in the given product list.
        detected_product = i

        # Get the prediction (detection) results and print them on the serial terminal.
        print("\n********** %s **********" % labels[i])
        for d in detection_list:
            # Draw a circle in the center of the detected objects (products).
            [x, y, w, h] = d.rect()
            center_x = math.floor(x + (w / 2))
            center_y = math.floor(y + (h / 2))
            img.draw_circle((center_x, center_y, 20), color=(255,0,255), thickness=3)
            print('\nDetected Label: %d | p: (%d, %d)' % (i, center_x, center_y))


    if(menu_config == 1):
        # Display the selection (options) menu.
        img.draw_rectangle(0, 0, 128, 30, fill=1, color =(0,0,0))
        img.draw_string(int((128-16*len("Add Cart"))/2), 3, "Add Cart", color=(0,255,0), scale=2)
        img.draw_rectangle(0, 130, 128, 160, fill=1, color =(0,0,0))
        img.draw_string(int((128-16*len("Remove"))/2), 135, "Remove", color=(255,0,0), scale=2)
        lcd.display(img)
        print("Selection Menu Activated!")
        while(menu_config == 1):
            j_x, sw = readJoystick()
            # Add the detected product to the database table.
            if(j_x > 3):
                cart_choice = "add"
                print("Selected Cart Option: " + cart_choice)
                img.draw_rectangle(0, 0, 128, 30, fill=1, color =(0,255,0))
                img.draw_string(int((128-16*len("Add Cart"))/2), 3, "Add Cart", color=(255,255,255), scale=2)
                img.draw_rectangle(0, 130, 128, 160, fill=1, color =(0,0,0))
                img.draw_string(int((128-16*len("Remove"))/2), 135, "Remove", color=(255,0,0), scale=2)
                lcd.display(img)
                adjustColor((0,1,0))
                sleep(1)
            # Remove the detected product from the database table.
            if(j_x < 2):
                cart_choice = "remove"
                print("Selected Cart Option: " + cart_choice)
                img.draw_rectangle(0, 0, 128, 30, fill=1, color =(0,0,0))
                img.draw_string(int((128-16*len("Add Cart"))/2), 3, "Add Cart", color=(0,255,0), scale=2)
                img.draw_rectangle(0, 130, 128, 160, fill=1, color =(255,0,0))
                img.draw_string(int((128-16*len("Remove"))/2), 135, "Remove", color=(255,255,255), scale=2)
                adjustColor((1,0,0))
                lcd.display(img)
                sleep(1)
            # Send the generated query (command), including the selected option (cart choice) and
            # the detected product's details, to the web application via Beetle ESP32-C3.
            if(sw == 0):
                query = "&"+cart_choice+"=OK&product_id="+products[detected_product]["id"]+"&product_name="+products[detected_product]["name"]+"&product_price="+products[detected_product]["price"]
                print("\nQuery: " + query + "\n")
                img.draw_rectangle(0, int(160/4), 128, int(160/2), fill=1, color =(0,0,255))
                img.draw_string(int((128-16*len("Query"))/2), int((160/2)-28), "Query", color=(255,255,255), scale=2)
                img.draw_string(int((128-16*len("Sent!"))/2), int((160/2)+8), "Sent!", color=(255,255,255), scale=2)
                lcd.display(img)
                uart.write(query)
                adjustColor((0,0,1))
                sleep(5)
                adjustColor((0,0,0))
                # Close the selection menu after transferring the product information and the selected option to the web application via Beetle ESP32-C3.
                menu_config = 0
                # Clear the detected label and the selected option (cart choice).
                detected_product = 0
                cart_choice = "EMPTY"

product_list.py

Python
products = [
            {"id": "000", "name": "err", "price": "err"},
            {"id": "001", "name": "Barilla", "price": "$4.72"},
            {"id": "002", "name": "Milk", "price": "$1.50"},
            {"id": "003", "name": "Nutella", "price": "$7.62"},
            {"id": "004", "name": "Pringles", "price": "$2.12"},
            {"id": "005", "name": "Snickers", "price": "$1.19"}
           ]

smart_grocery_cart_app_connection.ino

Arduino
         /////////////////////////////////////////////  
        //     IoT AI-driven Smart Grocery         // 
       //         Cart w/ Edge Impulse            //
      //           -----------------             //
     //            (Beetle ESP32-C3)            //           
    //             by Kutluhan Aktar           // 
   //                                         //
  /////////////////////////////////////////////

// 
// Provide a checkout-free shopping experience letting customers create an online shopping list from products in their cart and pay via email.
//
// For more information:
// https://www.theamplituhedron.com/projects/IoT_AI_driven_Smart_Grocery_Cart_w_Edge_Impulse
//
//
// Connections
// Beetle ESP32-C3 : 
//                                MFRC522
// D7   --------------------------- RST
// D2   --------------------------- SDA
// D6   --------------------------- MOSI
// D5   --------------------------- MISO
// D4   --------------------------- SCK
//                                OpenMV Cam H7
// D0   --------------------------- P4
// D1   --------------------------- P5
//                                5mm Common Anode RGB LED
// D21  --------------------------- R
// D8   --------------------------- G
// D9   --------------------------- B
//                                Buzzer
// D20  --------------------------- +   


// Include the required libraries:
#include <WiFi.h>
#include <SPI.h>
#include <MFRC522.h>

char ssid[] = "<_SSID_>";        // your network SSID (name)
char pass[] = "<_PASSWORD_>";    // your network password (use for WPA, or use as key for WEP)
int keyIndex = 0;                // your network key Index number (needed only for WEP)

// Define the server on LattePanda 3 Delta 864.
char server[] = "192.168.1.22";
// Define the web application path.
String application = "/smart_grocery_cart/shopping.php";

// Initialize the WiFiClient object.
WiFiClient client; /* WiFiSSLClient client; */

// Create the MFRC522 instance.
#define RST_PIN   7
#define SS_PIN    2
MFRC522 mfrc522(SS_PIN, RST_PIN);

// Define the MFRC522 module key input.
MFRC522::MIFARE_Key key;

// RGB:
#define red_p 21
#define green_p 8
#define blue_p 9
#define pwm_frequency 5000
#define resolution 8 /* 8-bit resolution */

// Buzzer:
#define buzzer_pin 20

// Define the data holders:
#define SERIAL_BAUDRATE  115200
String lastRead = "", OpenMV_data = "", response = "", table_name = ""; 

void setup() {
  Serial.begin(SERIAL_BAUDRATE);
  // Initialize the hardware serial port (Serial1) to communicate with the OpenMV Cam H7.
  Serial1.begin(SERIAL_BAUDRATE ,SERIAL_8N1,/*RX =*/0,/*TX =*/1);

  // Adjust the PWM pin settings for the RGB LED.
  ledcSetup(3, pwm_frequency, resolution); ledcSetup(4, pwm_frequency, resolution); ledcSetup(5, pwm_frequency, resolution);
  ledcAttachPin(red_p, 3); ledcAttachPin(green_p, 4); ledcAttachPin(blue_p, 5);

  // Initialize the MFRC522 hardware:
  SPI.begin();          
  mfrc522.PCD_Init();
  Serial.println("\n----------------------------------\nApproximate a New Card or Key Tag : \n----------------------------------\n");
  delay(3000);

  // Connect to WPA/WPA2 network. Change this line if using open or WEP network:
  WiFi.begin(ssid, pass);
  // Attempt to connect to the WiFi network:
  while(WiFi.status() != WL_CONNECTED){
    // Wait for the connection:
    delay(500);
    Serial.print(".");
  }
  // If connected to the network successfully:
  Serial.println("Connected to the WiFi network successfully!");
  adjustColor(0,0,255);
}

void loop(){
  // If the customer approaches the given RFID tag to the MFRC522 module:
  read_UID();
  delay(500);
  if(lastRead != ""){
    // Remove spaces from the detected UID.
    lastRead.replace(" ", "_");
    // Send an HTML email to the customer's registered email address via the web application, including the list of the products added to the cart and the link to the payment page. 
    make_a_get_request("?table="+table_name+"&send_email=OK&tag="+lastRead);
    // Clear the latest detected UID.
    lastRead = "";
    adjustColor(0,0,0);
  }

  // If the OpenMV Cam H7 transfers a command via serial communication:
  get_data_from_OpenMV();
  if(OpenMV_data != ""){
    // If the customer requested to change the table name to the latest registered table name in the database:
    if(OpenMV_data == "get_table"){
      // Make an HTTP Get request to obtain the latest registered table name:
      make_a_get_request("?deviceChangeTable");
      if(response != ""){
        // Elicit and format the received table name:
        int delimiter_1, delimiter_2;
        delimiter_1 = response.indexOf("%");
        delimiter_2 = response.indexOf("%", delimiter_1 + 1);
        // Glean information as substrings.
        table_name = response.substring(delimiter_1 + 1, delimiter_2);
        Serial.println("\nLatest Registered Table Name Obtained: " + table_name);
      }
    }else{
      // Make an HTTP Get request directly with the received command:
      make_a_get_request("?table="+table_name+OpenMV_data);
    }
    // Clear the latest received command:
    OpenMV_data = "";
    adjustColor(0,0,0);
  }
}

void make_a_get_request(String request){
  // Connect to the web application named smart_grocery_cart. Change '80' with '443' if you are using SSL connection.
  if (client.connect(server, 80)){
    // If successful:
    Serial.println("\nConnected to the web application successfully!\n");
    // Create the query string:
    String query = application + request;
    // Make an HTTP Get request:
    client.println("GET " + query + " HTTP/1.1");
    client.println("Host: 192.168.1.22");
    client.println("Connection: close");
    client.println();
  }else{
    Serial.println("\nConnection failed to the web application!\n");
    adjustColor(255,0,0);
    delay(2000);
  }
  adjustColor(255,255,0);
  delay(2000); // Wait 2 seconds after connecting...
  // If there are incoming bytes available, get the response from the web application.
  response = "";
  while(client.available()) { char c = client.read(); response += c; }
  if(response != ""){ Serial.println(response); adjustColor(0,255,0); }
}

void get_data_from_OpenMV(){
  // Obtain the transferred data packet from the OpenMV Cam H7 via serial communication.
  if(Serial1.available() > 0){
    Serial.println("\nTransferred query from the OpenMV Cam H7:");
    OpenMV_data = "";
    OpenMV_data = Serial1.readString();
    Serial.println(OpenMV_data);
    adjustColor(0,51,0);
    delay(2000);
    tone(buzzer_pin, 500);
    delay(1000);
    noTone(buzzer_pin);
    delay(1000);
  }
}

int read_UID(){
  // Detect the new card or tag UID. 
  if ( ! mfrc522.PICC_IsNewCardPresent()) { 
    return 0;
  }
  if ( ! mfrc522.PICC_ReadCardSerial()) {
    return 0;
  }

  // Display the detected UID on the serial monitor.
  Serial.print("\n----------------------------------\nNew Card or Key Tag UID : ");
  for (int i = 0; i < mfrc522.uid.size; i++) {
    lastRead += mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ";
    lastRead += String(mfrc522.uid.uidByte[i], HEX);
  }
  lastRead.trim();
  lastRead.toUpperCase();
  Serial.print(lastRead);
  Serial.print("\n----------------------------------\n\n");
  adjustColor(255,0,255);
  mfrc522.PICC_HaltA();
  delay(2000);
  return 1;
}

void adjustColor(int r, int g, int b){
  ledcWrite(3, 255-r);
  delay(100);
  ledcWrite(4, 255-g);
  delay(100);
  ledcWrite(5, 255-b);
  delay(100);
}

class.php

PHP
<?php

// Include the Twilio SendGrid Email PHP API:
// https://github.com/sendgrid/sendgrid-php/releases
require("sendgrid-php/sendgrid-php.php");

// Define the _main class and its functions:
class _main {
	public $conn;
	
	private $sendgrid_API_Key = "<_API_KEY_>";
	private $from_email = "<_FROM_EMAIL_>";
	
	public function __init__($conn){
		$this->conn = $conn;
	}
	
	// Database -> Create Table (New Customer)
	public function database_create_customer_table($table, $firstname, $lastname, $card_info, $email){
		// Create a new database table.
		$sql_create = "CREATE TABLE `$table`(		
							id int AUTO_INCREMENT PRIMARY KEY NOT NULL,
							firstname varchar(255) NOT NULL,
							lastname varchar(255) NOT NULL,
							card_info varchar(255) NOT NULL,
							email varchar(255) NOT NULL,
							product_id varchar(255) NOT NULL,
							product_name varchar(255) NOT NULL,
							product_price varchar(255) NOT NULL
					   );";
		if(mysqli_query($this->conn, $sql_create)){
			echo("<br>Database Table Created Successfully!");
			// Add the customer information to the recently created database table.
			$sql_insert = "INSERT INTO `$table`(`firstname`, `lastname`, `card_info`, `email`, `product_id`, `product_name`, `product_price`) 
						   VALUES ('$firstname', '$lastname', '$card_info', '$email', 'X', 'X', 'X')"
					      ;
			if(mysqli_query($this->conn, $sql_insert)) echo("<br><br>Customer information added to the database table successfully!");
			// If the customer information is added to the database table successfully, redirect the customer to the product list page.
            header("Location: product_list.php");
			exit();
		}else{
			// Redirect the customer to the home page if there is an error. 
			header("Location: ./?databaseTableAlreadyCreated");
			exit();
		}
	}
	
    // Database -> Insert Product Data:
	public function insert_new_data($table, $product_id, $product_name, $product_price){
		$sql_insert = "INSERT INTO `$table`(`firstname`, `lastname`, `card_info`, `email`, `product_id`, `product_name`, `product_price`) 
		               SELECT `firstname`, `lastname`, `card_info`, `email`, '$product_id', '$product_name', '$product_price'
				       FROM `$table` WHERE id=1"
			          ;
		if(mysqli_query($this->conn, $sql_insert)){ return true; } else{ return false; }
	}
	
	// Database -> Remove Product Data:
	public function remove_data($table, $product_id){
		$sql_delete = "DELETE FROM `$table` WHERE `product_id`='$product_id' limit 1";
		if(mysqli_query($this->conn, $sql_delete)){ return true; } else{ return false; }
	}
	
	// Retrieve the products added to the cart by the customer as a list.
	public function get_purchased_product_list($table){
		$product_names = []; $product_ids = []; $product_prices = [];
		$sql_list = "SELECT * FROM `$table` WHERE id!=1 ORDER BY `id` ASC";
		$result = mysqli_query($this->conn, $sql_list);
		$check = mysqli_num_rows($result);
		if($check > 0){
			while($row = mysqli_fetch_assoc($result)){
				array_push($product_names, $row["product_name"]);
				array_push($product_ids, $row["product_id"]);
				array_push($product_prices, $row["product_price"]);
			}
			return array($product_names, $product_ids, $product_prices);
		}else{
			return array(["Not Found!"], ["Not Found!"], ["Not Found!"]);
		}
	}
	
	// Obtain the latest registered customer's assigned table name from the database.
	public function get_table_name($return){
		$sql_get = "SELECT `table_name`, `create_time` FROM `information_schema`.`TABLES` WHERE `table_schema` = 'smart_grocery_cart' ORDER BY `CREATE_TIME` DESC limit 1";
		$result = mysqli_query($this->conn, $sql_get);
		$check = mysqli_num_rows($result);
		if($check > 0){
			while($row = mysqli_fetch_assoc($result)){
				if(!$return) echo("%".$row["table_name"]."%".$row["create_time"]."%");
				else return $row["table_name"];
			}
		}
	}
    
    // Obtain the email address of the customer from the database.
    private function get_email($table){
		$sql_email = "SELECT * FROM `$table` WHERE id=1";
		$result = mysqli_query($this->conn, $sql_email);
		$check = mysqli_num_rows($result);
		if($check > 0){
			if($row = mysqli_fetch_assoc($result)){ return $row["email"]; }
			else{ return "Not Found!"; }
		}
	}	
	
	// Send an email to the customer's registered email address, including the list of the products added to the cart and the link to the payment page.
	public function send_product_list_email($table, $tag){
		// Get the customer's email address.
		$to_email = $this->get_email($table);
		// Obtain the list of the products added to the cart from the customer's database table.
	    $product_names = []; $product_ids = []; $product_prices = [];
	    list($product_names, $product_ids, $product_prices) = $this->get_purchased_product_list($_GET['table']);
		$list = "";
		for($i=0; $i<count($product_names); $i++){
			$list .= '<tr>
						<td>'.$product_names[$i].'</td>
						<td>'.$product_ids[$i].'</td>
						<td>'.$product_prices[$i].'</td>
					  </tr>
					 ';   
		}	
		// Send an HTML email via the SendGrid Email PHP API.
		$email = new \SendGrid\Mail\Mail(); 
		$email->setFrom($this->from_email, "Smart Grocery Cart");
		$email->setSubject("Cart Product List");
		$email->addTo($to_email, "Customer");
		$email->addContent("text/html",
		                   '<!DOCTYPE html>
							<html>
							<head>
							<style>
								h1{text-align:center;font-weight:bold;color:#25282A;}
								table{background-color:#043458;width:100%;border:10px solid #25282A;}
								th{background-color:#D1CDDA;color:#25282A;border:5px solid #25282A;font-size:25px;font-weight:bold;}
								td{color:#AEE1CD;border:5px solid #25282A;text-align:left;font-size:20px;font-weight:bold;}
                                a{text-decoration:none;background-color:#5EB0E5;}
							</style>
							</head>
							<body>
						    <h1>Thanks for shopping at our store :)</h1>
						    <h1>Your Customer Tag: '.$tag.'</h1>
						    <table>
						     <tr>
						      <th>Product Name</th>
						      <th>Product ID</th>
						      <th>Product Price</th>
						     </tr>
							 '.$list.'
							 </table>
							 <a href="http://localhost/smart_grocery_cart/product_list.php"><h1> Checkout </h1></a>
							 </body>
							 </html>
						   '
                          );
			 
		$sendgrid = new \SendGrid($this->sendgrid_API_Key);
		try{
			$response = $sendgrid->send($email);
			print $response->statusCode() . "\n";
			print_r($response->headers());
			print $response->body() . "\n";
		}catch(Exception $e){
			echo 'Caught exception: '. $e->getMessage() ."\n";
		}
	} 
}

// Define database and server settings:
$server = array(
	"name" => "localhost",
	"username" => "root",
	"password" => "",
	"database" => "smart_grocery_cart"
);

$conn = mysqli_connect($server["name"], $server["username"], $server["password"], $server["database"]);

?>

shopping.php

PHP
<?php

include_once "assets/class.php";

// Define the new 'customer' object:
$customer = new _main();
$customer->__init__($conn);

// Create a new database table for the customer and insert the given customer information.
if(isset($_GET['table']) && isset($_GET['firstname']) && isset($_GET['lastname']) && isset($_GET['card_info']) && isset($_GET['email'])){
	$customer->database_create_customer_table($_GET['table'], $_GET['firstname'], $_GET['lastname'], $_GET['card_info'], $_GET['email']);
}

// Obtain the transferred product information from the Beetle ESP32-C3.
// Then, insert the received product data into the customer's database table.
if(isset($_GET['add']) && isset($_GET['table']) && isset($_GET['product_id']) && isset($_GET['product_name']) && isset($_GET['product_price'])){
	if($customer->insert_new_data($_GET['table'], $_GET['product_id'], $_GET['product_name'], $_GET['product_price'])){
		echo("Product information saved successfully to the customer's database table!");
	}else{
		echo("Database error!");
	}
}

// Delete the product information from the database table, that the customer removed from the cart.
if(isset($_GET['remove']) && isset($_GET['table']) && isset($_GET['product_id'])){
	if($customer->remove_data($_GET['table'], $_GET['product_id'])){
		echo("Product information removed successfully from the customer's database table!");
	}else{
		echo("Database error!");
	}
}

// Send an HTML email to the customer's registered email address via the SendGrid Email PHP API, including
// the list of the products added to the cart and the link to the payment page. 
if(isset($_GET['table']) && isset($_GET['send_email']) && isset($_GET['tag'])){
	$customer->send_product_list_email($_GET['table'], $_GET['tag']);
}

// Get the latest registered table name from the database.
if(isset($_GET["deviceChangeTable"])){
	$customer->get_table_name(false);
}

?>

index.php

PHP
<!DOCTYPE html>
<html>
<head>
<title>Smart Grocery Cart</title>

<!--link to index.css-->
<link rel="stylesheet" type="text/css" href="assets/index.css"></link>

<!--link to favicon-->
<link rel="icon" type="image/png" sizes="36x36" href="assets/icon.png">

<!-- link to FontAwesome-->
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v6.2.1/css/all.css">
 
<!-- link to font -->
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link href="https://fonts.googleapis.com/css2?family=Zen+Dots&display=swap" rel="stylesheet">

</head>
<body>
<?php ini_set('display_errors',1);?> 
<h1><i class="fa-solid fa-cart-shopping"></i> Please create your account to continue shopping :)</h1>

<div class="container">
<form method="get" action="shopping.php">
<div><label>First name:</label><input name="firstname" placeholder="John"></input></div>
<div><label>Last name:</label><input name="lastname" placeholder="Doe"></input></div>
<div><label>Email:</label><input name="email" placeholder="johndoe@gmail.com"></input></div>
<div><label>Account name:</label><input name="table" placeholder="John_123"></input></div>
<div><label>Card number:</label><input name="card_info" placeholder="5236 8965 9824 5668"></input></div>
<button type="submit"><i class="fa-solid fa-user-check"></i> Create Account</button>
</form>
</div>
</body>
</html>

update_list.php

PHP
<?php

include_once "class.php";

// Define the new 'customer' object:
$customer = new _main();
$customer->__init__($conn);

// Get the latest registered customer's table name.
$table = $customer->get_table_name(true);

// Obtain the list of the products added to the cart from the customer's database table.
$product_names = []; $product_ids = []; $product_prices = [];
list($product_names, $product_ids, $product_prices) = $customer->get_purchased_product_list($table);
$list = "<tr><th>Product Name</th><th>Product ID</th><th>Product Price</th></tr>";
for($i=0; $i<count($product_names); $i++){
	$list .= '<tr>
				<td>'.$product_names[$i].'</td>
				<td>'.$product_ids[$i].'</td>
				<td>'.$product_prices[$i].'</td>
			  </tr>
			 ';   
}	

// Return the generated product list.
echo($list);

?>

index.js

JavaScript
// Every 3 seconds, retrieve the list of the products added to the cart from the database table to inform the customer concurrently via the product list (payment) page.
setInterval(function(){
	$.ajax({
		url: "./assets/update_list.php",
		type: "GET",
		success: (response) => {
			$(".container table").html(response);
		}
	});
}, 3000);

product_list.php

PHP
<!DOCTYPE html>
<html>
<head>
<title>Product List</title>

<style>
html{background-color:#25282A;font-family:'Zen Dots', cursive;}
h1{text-align:center;font-weight:bold;user-select:none;background:-webkit-linear-gradient(grey, white);-webkit-background-clip:text;-webkit-text-fill-color:transparent;}

.container{position:relative;width:80%;background-image:linear-gradient(45deg, #1F2020, #A5282C);margin:auto;margin-top:30px;border:10px solid white;border-radius:20px;padding:15px;}
.container table{width:85%;color:white;margin:auto;border:3px solid white;user-select:none;}
.container th, .container td{border:3px solid white;color:#1F2020;}
.container th{background-color:#F3D060;}
.container td{color:white;}
.container button{display:block;background-image:linear-gradient(45deg, #1F2020, #5EB0E5);color:white;width:50%;height:auto;margin:auto;margin-top:50px;font-size:20px;border:5px solid white;border-radius:15px;font-weight:bold;}
.container button:hover{cursor:pointer;background-image:linear-gradient(45deg, #5EB0E5, #5EB0E5);}

</style>

<!--link to favicon-->
<link rel="icon" type="image/png" sizes="36x36" href="assets/icon.png">

<!-- link to FontAwesome-->
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v6.2.1/css/all.css">
 
<!-- link to font -->
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link href="https://fonts.googleapis.com/css2?family=Zen+Dots&display=swap" rel="stylesheet">

<!--link to jQuery script-->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>

</head>
<body>
<?php ini_set('display_errors',1);?> 
<h1><i class="fa-solid fa-cart-arrow-down"></i> Product List</h1>

<div class="container">
<table>
<tr>
<th>Product Name</th>
<th>Product ID</th>
<th>Product Price</th>
</tr>
</table>
<button><i class="fa-solid fa-credit-card"></i> Purchase</button>
</div>

<!--Add the index.js file-->
<script type="text/javascript" src="assets/index.js"></script>

</body>
</html>

index.css

CSS
html{background-image:url('background.jpg');background-repeat:no-repeat;background-attachment:fixed;background-size:100% 100%;font-family:'Zen Dots', cursive;}
h1{text-align:center;font-weight:bold;user-select:none;background:-webkit-linear-gradient(grey, white);-webkit-background-clip:text;-webkit-text-fill-color:transparent;}
input{background-image:linear-gradient(45deg, #1F2020, grey);color:white;font-weight:bold;}
label{user-select:none;}

.container{position:relative;background-image:linear-gradient(45deg, #1F2020, #A5282C);width:350px;height:350px;margin:auto;margin-top:150px;border:10px solid #25282A;border-radius:20px;padding:10px;}
.container div{position:relative;background-color:none;width:95%;height:auto;margin-top:25px;margin-bottom:15px;}
.container div input{position:absolute;right:0;width:150px;}
.container button{display:block;background-image:linear-gradient(45deg, #1F2020, #F3D060);width:70%;height:auto;margin:auto;margin-top:50px;font-size:20px;border:5px solid #25282A;border-radius:15px;font-weight:bold;}
.container button:hover{cursor:pointer;background-image:linear-gradient(45deg, #F3D060, #F3D060);}

Credits

Kutluhan Aktar

Kutluhan Aktar

70 projects β€’ 241 followers
Self-Taught Full-Stack Developer | @EdgeImpulse Ambassador | Maker | Physics Enthusiast

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