There are two Uno R4 models: Minima and WiFi. Open source library developers can apply for the Early Adopter Program from the UNO R4 preview page. Anyone developing a library for the Arduino UNO can apply to receive an UNO R4 early… for free! Supporting the community in this way means new users should be able to continue to leverage the existing wealth of shields, tutorials, and code developed for the UNO R3. To address this issue, Arduino announced the Early Adopter Program. For example, libraries optimized for a specific processor or architecture may need an update. However, changing to an Arm-based 32-bit processor means some software incompatibilities could exist. Libraries and examples written entirely in the Arduino language will probably work out of the box. The RA4M1 runs at 5 volts! So keeping the UNO pinout combined with MCU operating voltage means this new UNO R4 is compatible with existing hardware. One more feature maintains the hardware compatibility. All of these basic specs are significant upgrades over the previous UNO. In addition, this chip contains 32 kilobytes of SRAM and 256 kilobytes of flash. ![]() A Renesas RA4M1 32-bit Arm Cortex-M4 microcontroller (MCU) running at 48 MHz powers the R4. Fortunately for shield compatibility, the UNO R4 continues with the same physical form factor. The UNO, or technically the UNO R3, form factor is instantly recognizable. This new 32-bit board is the first significant upgrade to the venerable R3, which has been around since 2010. ![]() During the 10th Arduino Day, Arduino CEO Fabio Violante introduced the Arduino UNO R4.
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