Arduino Uno R3 Development Board - Control Voltage

Open-source electronics prototyping platform

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Arduino Uno - Wikipedia

Using a high-speed microprocessor controller (ATMEGA328), the development operation interface and environment are very simple and easy to understand,

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Arduino Uno R3 Development Board - Control Voltage

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UNO R3 Development Board ATMEGA328P Chip CH340G yellow micro-USB (Compatible with Arduino Uno)