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： 101M-8001280-IPS-CT-K User Guide 2.13inch e Paper HAT+ Black-White 250x122 E-Ink For Raspberry Pi /Jetson Nano /Sunrise X3 Pi /Pwnago NVIDIA SpotPear Raspberry Pi 12.3 inch HDMI LCD Captive TouchScreen Display 1920x720 For Jetson Series/Computer PC 0.96inch1.3inch1.44inch1.8inch LCD Display Screen Round Arduino Raspberry Pi ESP32 Pico STM32 TVBOX Kit Luckfox Pico Ultra And 4inch LCD RGB Captive TouchScreen Display Raspberry Pi 5 8 inch DSI LCD Captive TouchScreen MIPI Display 1280x800 Industrial One-Body Tablet PC With 5MP Front Camera Arduino-check-library-path DeepsSeek XiaoZhi AI Voice Chat ESP32-S3 1.54 inch LCD Kit N16R8 WROOM-1-N16R8 DevKitC-1 Development Board ESP32-P4 Module Core Board PSRAM 32MB Flash 16MB N16R32 Onboard ESP32-C6 Raspberry Pi 5 Audio Card ADXL357BEZ spotpear ESP32-C6 LCD Development Board 1.3 inch Display 1.3inch Screen ST7789 240x240 Mini TV SD-Port QST LVGL For Arduino R7FA4 Plus A Board Based on R7FA4M1AB3CFM Compatible with Arduino UNO For R4 Minima Spotpear Raspberry Pi 5 STLINK Raspberry Pi 9inch DSI MIPI LCD TouchScreen Display 9inch 720x1280 For Luckfox Lyra RK3506/ESP32-P4/Luckfox Omni3576

Arduino Uno R3 Hardware Reference

UNO R3 Development board Case ABS UNO R3 case for Arduino