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This shield is designed to use I2C or SPI communication protocols. I2C is the default, as it uses fewer pins: analog 4 and 5 are used for I2C (of course you can still connect other I2C devices to the bus). Digital #2 is used for "interrupt" notification. This means you don't have to sit there and 'poll' the chip to ask if a target tag has been found, the pin will pull low when a card, phone, etc is within range. You can adjust which pin is used if you need to keep digital #2 for something else. It is also easy to change the shield over to SPI where you can use any 4 digital pins by shorting two solder jumpers on the top of the PCB. Compatible with any "classic" Arduino - NG, Diecimilla, Duemilanove, UNO - as well as Mega R3 or later. For using the I2C interface with Mega R2 or earlier, two wires must be soldered as the I2C pins are in a different location on earlier Megas. FEATURE The chip uses NXP's PN532 NFC dedicated chip. Can be set via jumpers UART, SPI, and I2C interface communication. The integrated 3.3V LDO, the input voltage 3.6V ~ 6.0V, onboard power indicator. Leads all functions PN532 pin, convenient secondary development. All SMD components factory welding, stable quality, appearance neat appearance. The farthest reading distance of up to 7.5cm (with the size and location of the card on) According to the official website of the appropriate changes to the original file location and trace elements to make it more beautiful and tidy. Gift cards and NTAG M1 white label card for each one.

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