smart trolley project using EEPROM

Projects General Guidance
1

Hi! currently a stumble an issue about my project. when i was picking a topic for my project and i already buy the hardwares and do coding as much as i can do. i've already create programming which can scan a barcode and display it on serial monitor. And i forget a little bit thing that is important element for this project...database. I know theres storage called EEPROM built in arduino, but i don't know how. even watching tutorial i still don't understand. by refer to my coding can someone help a bit of what i need to change or added to this programming

#include <hidcomposite.h>
#include <hidescriptorparser.h>
#include <hidusagestr.h>

#include <HID.h> //Add to Oleg Mazurov code to Bar Code Scanner
#include <hiduniversal.h> //Add to Oleg Mazurov code to Bar Code Scanner
#include <usbhub.h>
#include <avr/pgmspace.h>
#include <Usb.h>
#include <usbhub.h>
#include <avr/pgmspace.h>
#include <hidboot.h>

USB Usb;
HIDUniversal Hid(&Usb); //Add this line so that the barcode scanner will be recognized, I use "Hid" below
//HIDBoot<HID_PROTOCOL_KEYBOARD> Keyboard(&Usb);

class KbdRptParser : public KeyboardReportParser
{
void PrintKey(uint8_t mod, uint8_t key); // Add this line to print character in ASCII
protected:
virtual void OnKeyDown (uint8_t mod, uint8_t key);
virtual void OnKeyPressed(uint8_t key);
};

void KbdRptParser::OnKeyDown(uint8_t mod, uint8_t key)
{
uint8_t c = OemToAscii(mod, key);
if (c)
OnKeyPressed(c);
}
/* what to do when symbol arrives */
void KbdRptParser::OnKeyPressed(uint8_t key)
{
if(key!=19) Serial.print((char)key);
else Serial.println();
};
KbdRptParser Prs;

void setup()
{
Serial.begin(9600);

if(Usb.Init()==-1) Serial.println("OSC did not start.");
else Serial.println("Barcode Ready");
Hid.SetReportParser(0,(HIDReportParser*)&Prs); //Change "Keyboard" for "Hid"
}

void loop()
{
Usb.Task();
}

2

There are examples for EEPROM usage in the IDE , perhaps a good start would be to say what problem your are having in understanding how that works and what you want to store.
All you posted is an example program for a bar code reader - have you written any code yourself?

I’m worried you mentioned “ database” , how does that come into it ??

3

That is doable for a small number of products . Get working on that saving to EEPROM stuff . If you are a beginner , take some time to study the examples

4

Your first step, in my opinion, would be to store the barcode that you read in a nul-terminated character array.

You can use that to find the details in the 'database'.

Now the question is what a 'database' is.

For a small number of articles, you can store those details in EEPROM. It gives you some flexibility to add, update and remove.

If the number of articles is too big, you can store them in PROGMEM; more space but no flexibility. Alternative can be to use an external EEPROM or FRAM module; that will give you the best of both worlds.

And obviously you can use a real database on a PC.