The Arduino Uno SMD is a microcontroller board based on the ATmega328. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button. 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.
The Uno differs from all preceding boards in that it does not use the FTDI USB-to-serial driver chip. Instead, it features the Atmega8U2 programmed as a USB-to-serial converter.
| Arduino type | Uno |
| Microcontroller | ATmega328 |
| Operating voltage | 5V |
| Input voltage range nom. | 7-12V |
| Maximum supply voltage | 20V |
| Digital I/O pins | 14 (of which 6 provide PWM output) |
| Analog input pins | 6 |
| DC Current per I/O pin | 40 mA |
| DC Current for 3.3V pin | 50 mA |
| Flash memory | 32 KB (ATmega328) of which 0.5 KB used by bootloader |
| SRAM | 2 KB (ATmega328) |
| EEPROM | 1 KB (ATmega328) |
| Clock speed | 16 MHz |
| USB Connector type | B Male |
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