![]() These pins are connected to the corresponding pins of the ATmega8U2 USB-to-TTL Serial chip. Used to receive (RX) and transmit (TX) TTL serial data. In addition, some pins have specialized functions: Serial: 0 (RX) and 1 (TX). If more than 500 mA is applied to the USB port, the fuse will automatically break the connection until the short or overload is removed. ![]() Although most computers provide their own internal protection, the fuse provides an extra layer of protection. Warnings The Arduino Uno has a resettable polyfuse that protects your computer's USB ports from shorts and overcurrent. ![]() Input Voltage (limit) Digital I/O Pins PWM Digital I/O Pins Analog Input Pins DC Current per I/O Pin DC Current for 3.3V Pin Flash Memory SRAM EEPROM Clock Speed LED_BUILTIN Length Width Weight 6-20V 14 (of which 6 provide PWM output) 6 6 20 mA 50 mA 32 KB (ATmega328P) of which 0.5 KB used by bootloader 2 KB (ATmega328P) 1 KB (ATmega328P) 16 MHz 13 68.6 mm 53. SKU: 8058333490137 Country of origin: IT Taric: 85235210 EECN: EAR-99 HTS: 84 Getting Started: Overview The Arduino Uno SMD R3 is a microcontroller board based on the ATmega328. Arduino Uno Rev3 SMD The board everybody gets started with, based on the ATmega328 (SMD).
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