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1 Small Speaker (located on the back of the board)
Onboard USB interface
4 UARTs(hardware serial ports)
you can not leave it in dry circumstances
PN532 NFC HAT for Raspberry Pi, I2C / SPI / UART ISG1321 1 Small Speaker (located onPN532 NFC HAT for Raspberry Pi, I2C SPI UART Overview This is a Raspberry Pi NFC HAT based on PN532 operating in the 13. 56MHz frequency range. It supports three communication interfaces: I2C, SPI, and UART. NFC (Near Field Communication) is a wireless technology allows contactless point to point data communication between devices within a short distance of 10 cm. It is widely used in applications such as access control system, smart tickets, meal
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