Arduino Uno R3 Hardware Reference

In the Arduino development board family, the Uno development board is the most beginner-friendly Arduino development board. Because it is easy to learn, stable and reliable, the Uno development board is also the most widely used development board with the most reference materials.

Arduino Uno is a development board based on microcontroller ATmega328P. It has 14 digital input/output pins (6 of these pins can be used as PWM output pins), 6 analog input pins, 16 MHz quartz crystal oscillator, USB interface, power interface, supports in-circuit serial Programming and reset buttons. Users only need to connect the development board to the computer through the USB interface to use it.

If you choose the Arduino clone board, you can learn how to install the driver for the Arduino clone board through our tutorial.

The main technical parameters

Microcontroller: ATmega328P

Working voltage: 5 volts

Input voltage (recommended) : 7-12 volts

Input voltage (limit) : 6-20 volts

Digital input and output pins: 14 (6 of which can be used as PWM pins)

PWM pins: 6

Analog input pins: 6

Input/Output Pin DC Current : 20mA

3.3V pin current: 50 mA

Flash Memory (flash memory): 32 KB (ATmega328P) of which 0.5 KB is used for system boot (bootloader)

SRAM (static memory): 2 KB (ATmega328P)

EEPROM: 1KB (ATmega328P)

Built-in LED pins: 13

Length: 68.6mm

Width: 53.4mm

Weight : 25g

Clock frequency: 16MHz

Pin Description Diagram

TAG： Industrial Modbus RTU RS485 4-ch Relay With isolation protection and guide rail ESP32 IR Thermal Imaging Camera 0.85inch LCD Raspberry Pi 7inch DSI UGV Rover PT Kit AI OpenCV Robot Car MediaPipe For Jetson Orin Banana Pi Raspberry Pi 4B RV1103 ESP32 S3 AI 1.54inch Development Board 1.54 inch TouchScreen Display DeepSeek Rockchip Raspberry Pi Secondary Screen ESP32 S3 AI Voice Chat Robot Mini Development Board DeepSeek USB Camera D-Robotics RDK X3 Module Core MD Module Horizon Sunrise Pi ARM Cortex-A53 5Tops Size Compatible With Raspberry Pi CM4 Size Raspberry Pi 5 PWM Fan Raspberry Pi ZERO Industrial 4-ch PWM RS485 pulse output module Modbus RTU rail Raspberry Pi 5 PCIe to M.2 SSD Accelerometer Raspberry Pi 5 Official Original AI Kit Hailo8l 13Tops/26Tops PCIe M.2 HAT+ Board For Pi5

Arduino Uno R3 Hardware Reference

UNO R3 Development board Case ABS UNO R3 case for Arduino