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： R7FA4 PLUS B Development Board Based on R7FA4M1AB3CFM Compatible with Arduino UNO For R4 WiFi Raspberry Pi Camera Raspberry Pi 5 PCIe TO Gigabit ETH USB3.2 HAT+ USB HUB Raspberry Pi 5 RTC charge configuration Raspberry Pi 8inch LCD 768x1024 Capacitive TouchScreen HDMI Display Ranging Sensor X1003 Raspberry Pi 5 PCIe to M.2 NVMe SSD MINI Adapter Board HAT Pi5 2242 2230 ESP32 1.54 inch E-Paper Smart Watch display Screen 200x200 Ultra-low power For Arduino/Micropython/RTOS For Watchy 7inch Monitor Display Raspberry Pi 5 Heatsink ESP32-Hi Mechanical Dog ESP32 C3 Servo AI Voice Chat Development Board Deepseek Raspberry Pi 5 Power Raspberry Pi 10.1 inch LCD HDM Display Capacitive TouchScreen 10.1EP-CAPLCD 1920x1200 For Jetson Nano/mini Computer PC ESP32-S3-Zero DAPLINK Industrial Modbus POE ETH RJ45 To 8-Ch Relay B RTU/Modbus TCP-Ethernet For IOT ESP32 ST7789 configuration 0.85inch LCD Button Mechanical Keyboard Display Screen 128x128 For Arduino /Raspberry Pi /ESP32 /RP2040 /STM32 ESP32-S3 Luckfox Pico SPI

Arduino Uno R3 Hardware Reference

UNO R3 Development board Case ABS UNO R3 case for Arduino