The following table compares the basic features of the various Arduinos and Arduino Compatibles mentioned in this guide. (click for a larger view).

For shield compatibility, be sure to check our Shield Compatibility Guide.
*On the 32U4 processors there is some overlap between the Analog Input and Digital I/O pins, so the total number of I/O pins will be less than the sum of the two.
For some very nicely done pinout charts of several of these Arduino boards, go to: http://www.pighixxx.com/arduino/

This guide was first published on Mar 23, 2013. It was last updated on Mar 23, 2013.

This page (Arduino Comparison Chart) was last updated on Apr 13, 2021.

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