user4833: I have a RFID module using NXP RC522 chipset.

I have no idea that is it correct the module using 27.120 mHz

And I have 4 IC card, 

A) 0005302176, (Blue color tag, come with the RFID module)
B) 0008846830 134,65006 (White card, come with the RFID module)
C) 0004189112 063,60344 (White card)
D) White card, no number print on the card. Only this card UID can be read.


Here is the pinout

Which I connected to Arduino UNO R3

     RFID         UNO R3
(Pin Name, Pin)    (Pin)
SDA        1        10
SCK        2        13
MOSI       3        11
MISO       4        12
IRQ        5        -No Connect-
GND        6        Ground
RST        7        9
3.3V       8        3.3V

PS: I am using this library, and this example.
PS: The serial return this information MFRC522 Software Version: 0x91 = v1.0

user16415: Check your power source, if you are powering the module from arduino/USB=>part or something like that, there can be not much power for the module.
Also you can try powering it 5v (not 3,3 as they should be powered by reference).
In my case I have had problems reading some types of cards, and I have solved that problems by giving better power supply, also higher power supply than in reference for some of the cards.
"By magic" the cards that were not working started working as a charm.
Also you should check if the cards you are using are all  ISO14443 A
Only that kind of cards is compatible with that reader.
So if you got type B, or other type of ISO cards, that will not be working.
Some of them may use different frequency, there is a bunch of standards around.
Also as said before the cards can be damaged, or could be corrupted if you tried reading UID while writing to the card, the problem is known , and in that case you can damage the UID.
I hope it helps you.
cheers

4833: <p>I have a RFID module using NXP RC522 chipset.
<img src="https://i.imgur.com/cWzYjHq.jpg?1" alt="Chipset"></p>

<p>I have no idea that is it correct the module using 27.120 mHz
<img src="https://i.imgur.com/Om83F4R.jpg" alt="27.120 mHz"></p>

<p>And I have 4 IC card, </p>

<pre>
A) 0005302176, (Blue color tag, come with the RFID module)
B) 0008846830 134,65006 (White card, come with the RFID module)
C) 0004189112 063,60344 (White card)
D) White card, no number print on the card. Only this card UID can be read.
</pre>

<p><img src="https://i.imgur.com/7bLU9gr.jpg" alt="4 IC Cards"></p>

<p>Here is the pinout
<img src="https://i.imgur.com/cqiDYTG.jpg" alt="Pinout">
Which I connected to Arduino UNO R3</p>

<pre>
     RFID         UNO R3
(Pin Name, Pin)    (Pin)
SDA        1        10
SCK        2        13
MOSI       3        11
MISO       4        12
IRQ        5        -No Connect-
GND        6        Ground
RST        7        9
3.3V       8        3.3V
</pre>

<p>PS: I am using this <a href="https://github.com/miguelbalboa/rfid" rel="nofollow noreferrer">library</a>, and this <a href="https://github.com/miguelbalboa/rfid/blob/master/examples/DumpInfo/DumpInfo.ino" rel="nofollow noreferrer">example</a>.</p>

<p>PS: The serial return this information <code>MFRC522 Software Version: 0x91 = v1.0</code></p>
 16415: <p>Check your power source, if you are powering the module from arduino/USB=>part or something like that, there can be not much power for the module.
Also you can try powering it 5v (not 3,3 as they should be powered by reference).</p>

<p>In my case I have had problems reading some types of cards, and I have solved that problems by giving better power supply, also higher power supply than in reference for some of the cards.</p>

<p>"By magic" the cards that were not working started working as a charm.</p>

<p>Also you should check if the cards you are using are all  ISO14443 A</p>

<p>Only that kind of cards is compatible with that reader.
So if you got type B, or other type of ISO cards, that will not be working.
Some of them may use different frequency, there is a bunch of standards around.</p>

<p>Also as said before the cards can be damaged, or could be corrupted if you tried reading UID while writing to the card, the problem is known , and in that case you can damage the UID.</p>

<p>I hope it helps you.
cheers</p>
