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： 7inch Round LCD HDMI Capacitive 7 inch Touchscreen Display 1080x1080 For Raspberry Pi/Jetson Nano/mini PC ESP32-AI Series User Guide Raspberry Pi 5 Gen3 Spotpear Jetson Orin 5G/4G/3G expansion board GNSS GPS SIM8260G-M2 SIM8262E-M2 CM4 OpenWrt Tutorial 7inch-DSI-LCD-H User Guide Raspberry Pi 5 D R7FA4 Plus A Board Based on R7FA4M1AB3CFM Compatible with Arduino UNO For R4 Minima Raspberry Pi Pico ST7789 Raspberry Pi 5 Fan Raspberry Pi Pico RP2040-LCD-0.96 User Guide Adjustable Focus User Guide Raspberry Pi Pico 2 RP2350 GEEK 1.14 inch LCD 240x135 65K SWD/UART/I2C For OpenOCD/CMSIS-DAP Raspberry Pi 2-Channel Isolated CAN Bus Expansion HAT Dual Chips Solution Built-In Multi Protections WiFi Wireless ESP32 DDSM Motor Driver HAT For Direct Drive Servo Hub Motors For Raspberry Pi ADXL354C Evaluation Board ESP32 S3 AI 1.75 inch Development Board with 1.75inch AMOLED Touchscreen Round Screen Deepseek Raspberry Pi Pico 2 RP2350 1.28 inch Round LCD Development Board 240x240 Display Screen QMI8658 6-Axis

Arduino Uno R3 Hardware Reference

UNO R3 Development board Case ABS UNO R3 case for Arduino