I am making a Smart Cart using RFID. The user will have a RFID card. As soon as he swipes the card on the RFID Reader it will identify the user(by comparing the unique RFID id with an already present id and will create a linked list for that particular user. The linked list will contain the unique Rfid based Ids of the items purchased by the user. In my code the problem is that after the detection of the user it is not creating any linked list for the items/it is not detecting the items bought by the user. Both the user and items are identified by their unique ids (ie RFID tags).It is detecting the user but once the user is being detected it is not mapping the items bought with that user.
int count = 0; // count = 0
int i;
char input[12]; // character array of size 12
boolean flag = 0;
// flag =0
boolean comparetag(char x[12], char bb[12])
{
boolean ff = false;
int fg = 0;
for (int cc = 0 ; cc < 12 ; cc++)
{
if (x[cc] == bb[cc])
{
fg++;
}
}
if (fg == 12)
{
ff = true;
}
return ff;
}
struct Node
{
char x[12];
struct Node *next;
};
struct Node* X;
struct Node* point;
void printList(struct Node *n)
{
while (n != NULL)
{
Serial.print( n->x);
n = n->next;
}
}
struct Node* Shopping( char[])
{
Serial.print(input);
// Print RFID tag number
Serial.print("Welcome User");
Serial.println();
Serial.print("Start Shopping ");
struct Node* head = NULL;
head = (struct Node*)malloc(sizeof(struct Node));
return head;
}
void setup()
{
Serial.begin(9600);
}
void loop()
{
if( flag== 0 )
{ if (Serial.available())
{
count = 0;
while(Serial.available() && count < 12) // Read 12 characters and store them in input array
{
input[count] = Serial.read();
count++;
delay(5);
}
if (comparetag(input,"1B006AFA9F14"))
{
flag = 1 ;
point,X= Shopping(input);
}
else {
Serial.println("not Registered User");}
}}
else{
int c=0;
if (Serial.available())
{
while(Serial.available () && c<12 ) // Read 12 characters and store them in input array
{
Serial.print("Taking Input");
X->x[c] = Serial.read();
c++;
delay(5);
}
struct Node* second = NULL;
second=(struct Node*)malloc(sizeof(struct Node));
second= NULL;
X->next=second;
X =second;
}}
printList(point);
}
