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Amazon.com: UMLIFE Micro SD SDHC TF Card Adapter Reader Module with SPI Interface Level Conversion Chip Compatible with Arduino Raspberry PI 10pcs : Electronics
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Amazon.com: CQRobot 13.56MHz PN532 NFC Expanding Board, I2C, SPI, UART Interfaces, Compatible with Raspberry Pi, Python/C, STM32, Arduino. for Payment System, Smart Home, Phone NFC App. : Electronics
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Using Raspberry Pi and Arduino together through SPI serial communications - Electronics information from PenguinTutor
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