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The Arduino UNO Rev3 A000066 is a development board based on the ATmega328P microcontroller, designed for prototyping, learning and the development of electronic applications. The main microcontroller operates at 16 MHz and can be programmed using the Arduino environment through the USB connection.
It provides 14 digital input/output pins, 6 of which can be used as PWM outputs, together with 6 analogue inputs with 10-bit resolution. The board provides UART, SPI and I²C/TWI communication interfaces as well as external interrupt inputs.
An ATmega16U2 microcontroller provides the USB-to-serial interface, with a USB Type-B connector used for connection to a computer. The ATmega328P includes a bootloader that allows programs to be uploaded without an external programmer, while direct programming is also possible through the ICSP header.
The board can be powered through USB or from an external supply. For external power, Arduino recommends 7 to 12 V, with a specified input limit of 6 to 20 V. The USB input incorporates a resettable fuse for protection against short circuits and overcurrent.
The UNO Rev3 also provides dedicated SDA and SCL signals next to AREF, the IOREF pin and a revised RESET circuit. On the A000066 version, the ATmega328P is socket-mounted and can therefore be replaced.
The board retains the classic Arduino UNO form factor and can be used with compatible shields and other peripherals, provided the specified voltages, currents and electrical limits of its pins are observed.
| Brand | Arduino |
| Model | UNO Rev3 |
| Manufacturer reference | A000066 |
| Type | Microcontroller development board |
| Main microcontroller | ATmega328P |
| USB-to-serial interface | ATmega16U2 |
| Architecture | AVR |
| Clock frequency | 16 MHz |
| Operating voltage | 5 V |
| Recommended input voltage | 7–12 V |
| Input voltage limit | 6–20 V |
| Current per I/O pin | 20 mA |
| Maximum current available from 3.3 V pin | 50 mA |
| Digital I/O pins | 14 |
| PWM outputs | 6: D3 / D5 / D6 / D9 / D10 / D11 |
| Analogue inputs | 6: A0–A5 |
| Analogue input resolution | 10 bits |
| External interrupts | D2 / D3 |
| UART | Yes, D0 RX / D1 TX |
| SPI | Yes, D10 SS / D11 MOSI / D12 MISO / D13 SCK and ICSP header |
| I²C / TWI | Yes, A4 SDA / A5 SCL |
| Flash memory | 32 KB, of which 0.5 KB is used by the bootloader |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| USB connection | USB Type-B |
| Power connector | 2.1 × 5.5 mm DC jack |
| Programming | USB via bootloader / ICSP |
| USB protection | Resettable fuse against overcurrent and short circuits |
| Built-in LED | D13 |
| Length | 68.6 mm |
| Width | 53.4 mm |
| Weight | 25 g |
LCA1009
