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

Pro Mini (new version)

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The Arduino Pro Mini is a microcontroller board based on the ATmega168 or ATmega328. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 8 analog inputs, an on-board resonator, a reset button, and holes for mounting pin headers. A six pin header can be connected to an FTDI cable […]

Pro Micro

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This tiny little board does all of the neat-o Arduino tricks that you’re familiar with: 4 channels of 10-bit ADC, 5 PWM pins, 12 DIOs as well as hardware serial connections Rx and Tx. Running at 16MHz and 5V

Version 1.0

Fishino Guppy

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Fishino GUPPY is the third board of Fishino family. It’s a board 100% compatible with the famous Arduino NANO, but with many add-ons which greatly enhance its capabilities. An important detail of Fishino GUPPY is the ability to be powered by a single cell LiPo battery, which gets automatically charged when another supply is available.

More […]

Fishino Mega

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Fishino MEGA is the second board of Fishino family. It’s a board 100% compatible with the famous Arduino MEGA, but with many add-ons which greatly enhance its capabilities. An important detail of Fishino MEGA is the ability to be powered by a single cell LiPo battery, which gets automatically charged when another supply is available.

More […]

Adafruit Feather 32u4 Adalogger pinout

Adafruit Feather 32u4 Adalogger pinout

Version 1.0

Adafruit Feather 32u4 Bluefruit LE pinout

Adafruit Feather 32u4 Bluefruit LE pinout

Version 1.0

Adafruit Feather 32u4 Basic Proto pinout

Adafruit Feather 32u4 Basic Proto pinout.

Version 1.0

Fishino

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Fishino UNO is based on Arduino platform, keeping all of its features and adding new ones.
This guarantees that all Arduino’s shields and libraries will work with no changes on Fishino UNO.

More info here.

Version 1.1

Lilypad USB

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Lilypad USB pinout