Arduino Uno R3

🔧 Arduino Uno R3 – Full Specifications
🧠 Microcontroller & Core
Microcontroller: ATmega328P
Architecture: 8-bit AVR
Clock Speed: 16 MHz
USB Interface Chip: ATmega16U2 (USB-to-Serial converter)
💾 Memory
Flash Memory: 32 KB (0.5–1 KB used by bootloader)
SRAM: 2 KB
EEPROM: 1 KB
🔌 Input / Output (I/O)
Digital I/O Pins: 14
6 pins support PWM output
Analog Input Pins: 6 (10-bit ADC)
Total I/O Pins: 20
🔗 Communication Interfaces
UART (Serial Communication)
SPI (Serial Peripheral Interface)
I2C (TWI)
🔋 Power & Electrical Characteristics
Operating Voltage: 5V
Input Voltage (Recommended): 7–12V
Input Voltage (Limits): 6–20V
DC Current per I/O Pin: 40 mA
DC Current for 3.3V Pin: 50 mA
🔌 Power Supply Options
USB connection (Type-B)
DC barrel jack (external adapter)
VIN pin (external supply)
Automatic power source selection
⚙️ Timers & Features
Timers:
2 × 8-bit timers
1 × 16-bit timer
ADC Resolution: 10-bit
PWM Channels: 6
🔗 Physical & Board Features
Dimensions: 68.6 mm × 53.4 mm
Weight: ~25 g (approx.)
USB Port: Type-B
Power Jack: DC barrel jack
ICSP Header: Yes
Buttons: Reset button
LED Indicators:
Power
TX/RX
Built-in LED (Pin 13)
🔧 Additional Hardware Features
Onboard voltage regulator (5V & 3.3V)
IOREF pin (for shield compatibility)
AREF pin (analog reference)
SDA/SCL pins added in R3 revision
Fully compatible with Arduino shields
💻 Software & Compatibility
Programming Language: Arduino (C/C++ based)
IDE Support: Arduino IDE
Operating System Support: Windows, macOS, Linux
Bootloader: Pre-installed (no external programmer needed)
🌐 Key Features
Plug-and-play via USB
Open-source hardware platform
Huge community and library support
Beginner-friendly and widely documented
🧪 Typical Applications
Robotics projects
Sensor interfacing
Automation systems
LED and motor control
Educational and STEM learning