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： Raspberry Pi 7 inch HMI industrial DSI Display LCD 7inch TouchScreen Computer 720×1280 Raspberry Pi 5 Camera User Guide Raspberry Pi 5 Pure-Copper Active Cooler MEGA2560 R3 Jetson Orin NX Case Arduino Thermal imaging camera LCC-14 Milk-V Duo RJ45 Raspberry Pi 5/4B easy Adapter Micro HDMI to HDMI 4K All Ports To Pi's USB Side DeepSeek AI Voice Chat Camera Robot BOX ESP32-S3 Development Board 2 inch LCD N16R8 Touchscreen Display Camera Raspberry Pi MLX90641 Milk-V Duo S Usage of USB Type A interface Pi5 Fan Allwinner Raspberry Pi Buzzer Raspberry Pi 3.5 inch DSI Display MIPI LCD (H) Capacitive TouchScreen 480x800 Raspberry Pi Pico 2 RP2350 1.47 inch LCD Display Development board RP2350A 1.47inch Screen RGB color $8.5 xiaozhi AI Character Personality Configuration Tutorial Milk-V Duo S Usage of USB Type A interface Raspberry Pi 5 PCIE to MiniPCIe For wireless network WIFI Card USB Bluetooth

Arduino Uno R3 Hardware Reference

UNO R3 Development board Case ABS UNO R3 case for Arduino