The Arduino Uno R3 is a microcontroller board based on the ATmega328 (datasheet). It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz ceramic resonator, 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.
Arduino Uno R3 of the board has the following new features:
- 1.0 pinout: added SDA and SCL pins that are near to the AREF pin and two other new pins
placed near to the RESET pin, the IOREF that allow the shields to adapt to the voltage provided
from the board. In future, shields will be compatible both with the board that use the AVR,
which operate with 5V and with the Arduino Due that operate with 3.3V. The second one is a
not connected pin, that is reserved for future purposes.
- Stronger RESET circuit.
|Input Voltage (recommended)||7-12V|
|Input Voltage (limit)||6-20V|
|Digital I/O Pins||14 (of which 6 provide PWM output)|
|PWM Digital I/O Pins||6|
|Analog Input Pins||6|
|DC Current per I/O Pin||20 mA|
|DC Current for 3.3V Pin||50 mA|
|Flash Memory||32 KB of which 0.5 KB used by bootloader|
|Clock Speed||16 MHz|
- ATmega16U2 replaces 8U2 as USB-to-Serial converter.