Sensor
RC522 RFID reader (SPI)
Reads 13.56 MHz cards and fobs — the key to access-control and treasure-chest builds.
Pinout
- VCCpower (3.3 V)
- SDAdigital
- RSTdigital
- GNDground
Bench notes
SPI pins (SCK/MOSI/MISO) go to the board's hardware SPI header — the diagram labels the two that vary.
- Typical price
- $2.90
- Libraries
- MFRC522
- Prompt keywords
- rfid, card, tag, badge