What is this?

There are many different Arduino microcontroller boards. Here the pinouts of the most popular.

Lilypad SimpleSnap

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Lilypad SimpleSnap pinout

Lilypad Simple

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Arduino Lilypad Simple pinout

LilyPad

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Arduino LilyPad pinout

Fio

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Arduino Fio pinout

Ethernet

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Arduino Ethernet pinout

Esplora

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Arduino Esplora pinout

Micro

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Arduino Micro pinout

Mini

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Arduino Mini pinout

Nano

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Arduino Nano pinout

Pro

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Arduino Pro pinout