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The Arduino Uno SMD CH340 is a cost-effective version of the classic Arduino Uno R3. It uses an SMD ATmega328P chip, making it slightly different from the DIP version. Features 14 digital I/O pins, 6 analog inputs, and PWM capability. CH340 USB-to-serial converter requires additional driver installation. Operates at 5V and runs at 16MHz for stable performance. Supports Arduino IDE for coding and hardware interfacing. Perfect for beginners and hobbyists in embedded systems development.