The Arduino Uno Rev3 is an iteration of the Arduino Uno, which is one of the most popular boards in the Arduino family. Here are the key features and specifications of the Arduino Uno Rev3:
- Microcontroller: It uses the ATmega328P microcontroller, which is an 8-bit AVR RISC-based microcontroller.
- Memory:
- Flash Memory: 32 KB (ATmega328P) of which 0.5 KB used by bootloader.
- SRAM: 2 KB
- EEPROM: 1 KB
- Operating Voltage: 5V
- Input Voltage (recommended): 7-12V
- Digital I/O Pins: 14 (of which 6 provide PWM output)
- Analog Input Pins: 6
- DC Current per I/O Pin: 20 mA
- DC Current for 3.3V Pin: 50 mA
- Clock Speed: 16 MHz
- USB Connection: It features a USB-B port for programming and power supply, although newer models like the R4 series have transitioned to USB-C.
- Layout: The board layout is standardized with:
- An ICSP header for programming the microcontroller directly.
- A reset button for restarting the board.
- A power jack for external power supply.
- Headers for connecting to breadboards or shields.
Notable Features of the Rev3:
- Improved Design: The Rev3 version includes minor improvements in design over previous revisions, like the addition of a SMD version of the ATmega328P for easier manufacturing.
- Compatibility: It’s compatible with all existing shields designed for the Uno form factor, making it versatile for expansion.
- ATmega16U2: The Rev3 uses an ATmega16U2 (instead of the older 8U2) as the USB-to-serial converter, which can be reprogrammed if needed for custom USB implementations.
- Power Selection: It has an on-board voltage regulator and can be powered via the USB connection or with an external power supply, with automatic selection of the highest voltage source.
- LEDs: It includes an LED connected to pin 13 for testing, a power LED, and TX/RX LEDs to indicate serial data transmission.
The Arduino Uno Rev3 remains a fundamental choice for beginners and professionals alike due to its ease of use, extensive documentation, and wide community support. It’s perfect for learning electronics, prototyping, and for projects that don’t require high computational power or specific advanced features like Wi-Fi or Bluetooth.
Arduino Uno is a microcontroller board based on the ATmega328P (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 (CSTCE16M0V53-R0), 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.. You can tinker with your Uno without worrying too much about doing something wrong, worst case scenario you can replace the chip for a few dollars and start over again.
“Uno” means one in Italian and was chosen to mark the release of Arduino Software (IDE) 1.0. The Uno board and version 1.0 of Arduino Software (IDE) were the reference versions of Arduino, now evolved to newer releases. The Uno board is the first in a series of USB Arduino boards, and the reference model for the Arduino platform; for an extensive list of current, past or outdated boards see the Arduino index of boards.
Related Boards
If you are interested in boards with similar functionality, at Arduino you can find:
Getting started
The Getting Started with Arduino Uno page contains all the information you need to configure your board, use the Arduino Software (IDE), and start tinkering with coding and electronics.
From the Tutorials section you can find examples from libraries and built-in sketches as well other useful information to expand your knowledge of the Arduino hardware and software.
Find inspiration for your Uno projects from our tutorial platform Project Hub.
| Microcontroller | ATmega328P |
| Operating Voltage | 5V |
| 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 (ATmega328P) of which 0.5 KB used by bootloader |
| SRAM | 2 KB (ATmega328P) |
| EEPROM | 1 KB (ATmega328P) |
| Clock Speed | 16 MHz |
| LED_BUILTIN | 13 |
| Length | 68.6 mm |
| Width | 53.4 mm |
| Weight | 25 g |