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How big can an Arduino program be?

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Arduino Board Size & Pricing Comparison

Arduino Uno dimensions of 2.7\u201d x 2.1\u201d fall somewhere in between the Micro and the Mega 2560.Feb 28, 2021

Arduino Uno vs Mega vs Micro - Arrow Electronics

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How big of a project can be built using Arduino? Depends on the model. You can go from around 4 KB of programmable memory to 256 KB, and then get into the larger models like the Due (512 KB).