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Some of them are a separate set of equipment
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Expands controller options: adds useful value when choosing parts for a build
MFRC522 NFC RFID Reader Module 13.56MHz - SPI Card+Keyfob cnc color:#111827}13. 56MHz RFID reader writer on the NXP MFRC522 chip. Talks SPI, reads and writes MIFARE cards. Kit ships with an S50 card and a key fob to start. Specs Chip NXP MFRC522 Frequency 13. 56 MHz Standard ISO IEC 14443A Interface SPI Cards MIFARE S50, S70, Ultralight, Pro, Desfire Voltage 2. 5 3. 3V Read range ~5 cm Size 59. 9 x 39. 7 mm Includes S50 card + key fob Runs on 3. 3V logic. Common Arduino pick for door locks, attendance and RFID login. MFRC522
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