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Meet the perfect upgrade for your small-footprint Arduino projects. 644 Narrow and 1284 Narrow are small, simple, ATmega644/1824-based boards designed to improve your small footprint Arduino projects. The Narrow board gives you two to eight times more flash and RAM resources and ten more digital I/O as compared to an Uno/Nano, plus total compatibility.
You can add an optional OLED on top of the board, which allows a very small graphic/text rendering solution. With the high amount of resources available you are going to be surprised by how many functions and graphics you will store in these devices.