RFID problem

Using Arduino Programming Questions
#1

Hello !
I`m working on a RFID database project , and I am having problems with reading the cards .
I have 4 separate cards that i register in the database but all the cards are read the same .

The reader also shows strange symbols instead of numbers for the cards ex : ÿÿÿÿÿÿÿÿÿÿÿ
I have set the baudrate in the code and the monitor to 9600 and have tried other rates but still getting random characters instead of reading the cards .

I`m using for this project an Arduino Uno v3 with a ID-12LA reader .

void RegisterCard()
{
  // Read a card
  for (int rs = 0; rs < 6; rs++)
  {
    rfid_data[rs] = '0';
  }
  rfid_data[10] = '\0';

  digitalWrite(6, LOW);
  delay(500);
  do
  {
    delay(200);
  } while (RFID.available() <= 0);

  digitalWrite(6, HIGH);
  delay(500);
  Serial.println("Citeste card");
  rfid_data[0] = RFID.read();
  if (int(rfid_data[0]) == 10)
  {
    for (i = 0; i < 7; i++)
    {
      rfid_data[i] = RFID.read();
    }
    rfid_data[10] = '\0';
  }

Code for reading a card

#2

You're falling into a classic trap. You make sure that there is at least one byte available in the Serial buffer and then try to read out 7 bytes.

Here's a hint. The funky looking y thingy, that's what you get when you try to read serial data that isn't there.

#3

Delta_G:
Here’s a hint. The funky looking y thingy, that’s what you get when you try to read serial data that isn’t there.

Im not really sure what i need to modify , im very new to programing .
If you could explain it more like for dummies so i could understand it . :smiley:

if (int(rfid_data[0]) == 10)
{
for (i = 0; i < 7; i++)

Is this the problem ?

#4