This auxiliary microcontroller has its own USB bootloader, which allows advanced users to reprogram it. Instead, it features the Atmega8U2 programmed as a USB-to-serial converter. The Uno differs from all preceding boards in that it does not use the FTDI USB-to-serial driver chip. It contains everything needed to support the microcontroller simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started. It has 20 digital input/output pins (of which 6 can be used as PWM outputs and 6 can be used as analog inputs), a 16 MHz resonator, a USB connection, a power jack, an in-circuit system programming (ICSP) header, and a reset button. The Arduino Uno SMD is a microcontroller board based on the ATmega328. The two versions are functionally identical, differing only in the package of the microcontroller, but you will not be able to easily replace the AVR on the SMD version if it gets damaged (doing so requires SMT soldering skill and specialized desoldering equipment). This Arduino Uno has a surface-mount-device (SMD) AVR instead of the removable DIP AVR on the original Arduino Uno. Note: This product has been replaced by the newer Arduino Uno R3, which has a dual-inline-package (DIP) AVR.
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