I wanted to record data on my RPI. Then I want to send this data with NFC to a Android Mobile app. Is this possible, and if yes, which component would I need?
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You can use a PN532 or MFRC522. The Elechouse PN532 is cheap on eBay. Doesn't have stellar range active-to-passive, i.e. when reading or writing tokens, but may have much better speed and range with a mobile phone. Pay attention to voltage, 3V3 for SPI and 5V for I2C.
Use libnfc, plenty of samples on Google.
https://learn.adafruit.com/adafruit-pn532-rfid-nfc/libnfc
Note that the Adafruit shield or breakout board (with its hefty pricetag) is only slightly better in terms of range, 1-2 cm.
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