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The Arduino Uno Rev3 is one of the most popular development boards from Arduino, widely used by hobbyists, makers, and professionals for various electronics and robotics projects. Here are the key specifications of the Original Arduino Uno Rev3:

Microcontroller:

• ATmega328P (8-bit AVR microcontroller)

Operating Voltage:

• 5V (operating voltage)
• Recommended Input Voltage: 7-12V
• Input Voltage Limits: 6-20V

Digital I/O Pins:

• 14 Digital I/O Pins (of which 6 can provide PWM output)
  • Pins 0-13 (Digital Pins 0-13 can be used for input and output operations)

Analog Input Pins:

• 6 Analog Inputs (A0-A5)
  • 10-bit resolution (0-1023)

PWM Pins:

• 6 PWM Pins (Pins 3, 5, 6, 9, 10, 11)

Clock Speed:

• 16 MHz

Flash Memory:

• 32 KB of flash memory (ATmega328P)
  • 0.5 KB used by bootloader

SRAM (Static Random Access Memory):

• 2 KB SRAM

EEPROM (Electrically Erasable Programmable Read-Only Memory):

• 1 KB

Communication:

• 1 x UART (Universal Asynchronous Receiver-Transmitter) via Pin 0 (RX) and Pin 1 (TX)
• 1 x SPI (Serial Peripheral Interface) via Pins 11 (MOSI), 12 (MISO), and 13 (SCK)
• 1 x I2C (Inter-Integrated Circuit) via Pins A4 (SDA) and A5 (SCL)

Power:

• USB connection (5V) or external power supply (7-12V recommended)
• Voltage Regulator for powering from external sources (e.g., 9V battery, AC-to-DC adapter)

LED:

• Built-in LED on Pin 13

Reset:

• 1 Reset Button (used to restart the microcontroller)

USB Interface:

• 1 USB-B Port (for programming and communication with a computer)

Dimensions:

• Length: 68.6 mm (2.7 inches)
• Width: 53.4 mm (2.1 inches)
• Height: 15 mm (0.6 inches)

Other Features:

• Power Jack: Barrel jack for connecting external power supply
• External Power Supply: Can be powered via an external 2.1mm barrel jack or a VIN pin (with a voltage range of 7-12V)
• Microcontroller Resettable: Can be reset manually via the reset button or automatically through the programming process.

Compatibility:

• Arduino IDE (Integrated Development Environment) for writing, compiling, and uploading code to the Arduino board
• Open-source Hardware and Software: Full compatibility with Arduino's open-source ecosystem (libraries, shields, and accessories)

Key Notes:

• USB Interface: The Uno uses an ATmega16U2 chip for USB-to-serial communication.
• Bootloader: The Uno has a pre-installed bootloader, making it easy to upload code to the board via the USB connection.

The Arduino Uno Rev3 is widely used due to its simplicity, robustness, and compatibility with various sensors, modules, and shields, making it an ideal choice for beginners and professionals alike.