We have been working hard to make sure the UNO R4 is highly retrocompatible with code written for UNO R3, including tutorials and libraries.” For more information about the Arduino UNO R4 check ...

An Arduino is a popular open-source single-board microcontroller. Learn how to program one and let the possibilities take shape.

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Creators can start with devices such as the Arduino, an inexpensive control board that’s easy to program and can hook up to a wide variety of hardware.

The Arduino Uno R4 is to have a Renesas RA4M1 32-bit Arm Cortex-M4 microcontroller, and there are “no plans to discontinue the popular Uno R3” , according to Arduino, which estimates that R4 will ...