How do I use the additional serial ports on an Arduino UNO R3 clone?

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I bought this Arduino clone over eBay. It seems to have an extra SPI and serial ports. How do I use these?

score 4 · Answer 1 · answered May 05 '15 at 08:55

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Those are not additional I²C and UART ports, those are additional connectors connected to the normal peripherals. They are used in exactly the same manner as the normal connector.

answered May 05 '15 at 08:55

Ignacio Vazquez-Abrams

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score 4 · Accepted Answer · answered May 05 '15 at 09:29

UNO means ATmega328. It has always only one serial and one I2C port regardless of how many connectors (or solder pads) it is hooked to. They are just parallel outputs to ATmega pins: D0 - TX D1 - RX A5 - SCL A4 - SDA

Extra pads are just for user convenience, for easier wiring.

How do I use the additional serial ports on an Arduino UNO R3 clone?

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