Why is my RFID-RC522 module not working?

[codepirate7]

Hello. I have bought an Arduino UNO kit that came with an RFID module. I have soldered the pins on the RFID module, then I did the wiring.
RFID Arduino
RST 9
SDA(SS) 10
MOSI 11
MISO 12
SCK 13
GND GND
3.3V 3.3V
I've installed the MFRC522 library from the github community. Then I've tried running the dumpinfo example from the MFRC522 library.
Nothing came on the console, except a message saying that its not connected
Please see the photos below, its my first time using Arduino

[awneil]

Does that module have the correct voltage-level adjustments to work with a 5V Arduino?

See:

RFID RC522 malfunction multi scan

If you wire up a RC522 to a 5V processor you need level shifters to protect the chip from the output signals from the 5V chip. Despite many on line tutorials showing nothing in the way of level shifting it is needed to avoid damaging the RFID reader. It can be done simply with a bunch of resistors.

[codepirate7]

Thank you for answering me. But I don't get it, my Arduino has both 5V and 3.3V pins, and i'm using the 3.3V pin for te 3.3V on the module, do I still need to use resistors even though I'm connecting it to the 3.3V pin?
Why is that?

[awneil]

@codepirate7

my Arduino has both 5V and 3.3V pins, and i'm using the 3.3V

Those are just the power supply pins - you also need to take care of the interface pins - see the follow-up post in that thread:

RFID RC522 malfunction multi scan

This is a schematic that wires up this chip correctly. [
RFID reader to Arduino]

[Grumpy_Mike]

@codepirate7

Why is that?

Because the pins of the RC522 are not 5V tolerant. See the data sheet for this chip and see if you can find if they are. If it is not mention then they aren't. It is unusual for a 3V3 chip to have 5V tolerant inputs and the manufacturers would brag about it on the first page of the data sheet. Look for the tables that show maximum and minimum voltages for signals into this chip.