Arduino UNO Original Development Board with USB Cable
Price in Sri Lanka

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