Arduino Uno Rev3 SMD The Arduino Uno SMD R3 is a microcontroller board based on the ATmega328. It has 14x digital input/output pins (6 of which can be used as PWM outputs), 6x analogue inputs, a 16MHz quartz oscillator, a USB port, a power socket, 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 supply it with an AC/DC adapter or battery to get started. The Uno differs from all previous cards by not using the FTDI USB to Serial driver chip.
Additional functions of the R3 version are: ATmega16U2 instead of 8U2 as a USB serial converter.
-1.0 pin assignment: SDA and SCL pins for TWI-communication have been added near the ARF pin and two other new pins near the RST pin, the IORF, with which the shields can adapt to the voltage supplied by the circuit board, and the second is an unconnected pin reserved for future purposes.
Stronger RST circuit.
Uno means in Italian and describes the upcoming release of Arduino 1.0. The Uno and version 1.0 will be the reference versions of Arduino. The Uno is the latest in a range of USB Arduino boards and the reference model for the Arduino platform.