Wiring_for_RC522_card_reader
Here a fritzing layout for wire a RC522 with the Raspberry Pi incl. IRQ Pin, 2 different views (RPi3 and RPi Zero) on the same schematic in line with the recommended pinout.
You have to wire the IRQ Pin from RC522 to Raspberry Pin 18/GPIO 24. See also https://github.com/MiczFlor/RPi-Jukebox-RFID/issues/1227#issuecomment-881250852
See the fritzing Picture (brown cable is the IRQ Pin) ...you must soldering all 8 wires from the Reader...
The following table shows an alternative wiring using pins 17 and 20 for 3.3V and GND respectively instead of 1 and 6 (leftmost and rightmost columns are pins on the Raspi and RC 522). This allows to use the consecutive block from pin 17 to pin 24. In particular, one can use a ribbon cable with a 4x2 plug on the raspi end and an 8x1 plug on the RC522 end to connect the two. The middle two columns are meant to simplify building such a cable: on the raspi side "relative" = actual - 16 on the RC 522 side "relative" = 9 - actual.
| Raspi | Raspi Relative | RC 522 Relative | RC 522 |
|---|---|---|---|
| 17 | 1 | 1 | 8 |
| 18 | 2 | 4 | 5 |
| 19 | 3 | 6 | 3 |
| 20 | 4 | 3 | 6 |
| 21 | 5 | 5 | 4 |
| 22 | 6 | 2 | 7 |
| 23 | 7 | 7 | 2 |
| 24 | 8 | 8 | 1 |