Arduino Uno

The Arduino UNO is the most widely used and documented development board in the Arduino ecosystem. Based on the ATmega328P microcontroller, it offers 14 digital I/O pins, 6 analog inputs, and USB connectivity for programming and serial communication. Ideal for beginners and professionals alike.

Specifications

Microcontroller: ATmega328P
Operating Voltage: 5?V
Input Voltage: 7–9?V
Digital I/O Pins: 14 (of which 6 support PWM)
Analog Input Pins: 6
DC Current per I/O Pin: 20?mA
Flash Memory: 32?KB (ATmega328P)
- 0.5?KB used by bootloader
SRAM: 2?KB
EEPROM: 1?KB
Clock Speed: 16?MHz (ceramic resonator)
USB Interface: Atmega16U2 (R3 version) or Atmega8U2 (R2 and earlier)
Communication: UART, SPI, I²C
Programming Interface: USB-B (via included cable)
Power Jack: Barrel connector (2.1?mm centre-positive)
ICSP Header: 6-pin for external programmer
Reset Button: Onboard
Features

Plug-and-play USB programming and serial monitoring
Compatible with Arduino IDE and vast open-source libraries
Breadboard-friendly layout with standard headers
Ideal for embedded control, sensor interfacing, and educational projects
Common use cases:
- STEM learning and classroom kits
- Robotics and automation controllers
- Sensor data acquisition and logging
- Serial-controlled relays, motors, and displays