Arduino Uno R3 board
The Arduino Uno R3 Board has a 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.
Revision 2 of the Uno board has a resistor pulling the 8U2 HWB line to ground, making it easier to put into DFU mode.
Revision 3 of the board:
In future shields will be compatible with both the board that uses the AVR.
Which operates with 5V and with the Arduino Due that operates with 3.3V.
The second one is a not connected pin, that is reserved for future purposes.
Stronger RESET circuit.
Atmega 16U2 replace the 8U2.
“Uno” means one in Italian and is named to mark the upcoming release of Arduino 1.0.
The Uno and version 1.0 will be the reference versions of Arduino, moving forward.
The Uno is the latest in a series of USB Arduino boards, and the reference model for the Arduino platform.
Specifications:
| ARDUINO MICROCONTROLLER | |
| Microcontroller | ATmega328 |
| Architecture | AVR |
| Operating Voltage | 5 V |
| Flash memory | 32 KB of which 0.5 KB used by bootloader |
| SRAM | 2 KB |
| Clock Speed | 16 MHz |
| Analog I/O Pins | 6 |
| EEPROM | 1 KB |
| DC Current per I/O Pins | 40 mA on I/O Pins; 50 mA on 3,3 V Pin |
| GENERAL | |
| Input Voltage | 7-12 V |
| Digital I/O Pins | 20 (of which 6 provide PWM output) |
| PWM Output | 6 |
| PCB Size | 53.4 x 68.6 mm |
| Weight | 25 g |
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