add details about cards for RC522 (#2372)

* add details about cards * fix empty line * Update documentation/developers/rfid/mfrc522_spi.md Co-authored-by: Alvin Schiller <[email protected]> --------- Co-authored-by: Alvin Schiller <[email protected]>
MiczFlor · May 17, 2024 · 2232a35 · 2232a35
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diff --git a/documentation/developers/rfid/mfrc522_spi.md b/documentation/developers/rfid/mfrc522_spi.md
@@ -78,3 +78,7 @@ MISO.
 MFRC522 boards can be picked up from many places for little money.
 
 Good quality ones can be found e.g. here
+
+### Cards/Tags
+
+Cards or tags must support 13.56 MHz. Currently, only cards/tags of the type "NXP Mifare Classic 1k(S50)", "NXP Mifare Classic 4k(S70)" and "NXP Mifare Ultralight (C)" can be used. Type "NXP Mifare NTAG2xx" or others will not work!