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： MPW7 Raspberry Pi 5 PCIe to WIFI7 Adapter Board HAT Pi5 For Google TPU BE200 AX210 AI 1.83inch LCD TouchScreen Display 240&amp;amp;times;280 NV3030B Arduino Raspberry Pi ESP32S3 Pico STM32 Round Rotary LCD touch screen 1.28inch 1.6inch 2.1inch Knob central control lighting LCD Raspberry Pi 7.5 inch e-Paper link (H) RYBW 800x480 For Arduino / Jetson Nano / STM32 Industrial USB TO RS485 Isolated Bidirectional Converter Original FT232RNL 1200m Long Distance Raspberry Pi RP2040 Keyboard 1.54inch OLED Display Digital Input EPS32S3 1.8inch Round LCD Display WIFI-AIDA64-Secondary-TouchScreen/Wireless-Power/Video-Player LVGL Raspberry Pi 1.44inch LCD display HAT Sipeed NanoKVM Cube KVM HDMI Remote OS Control Manager Install /Power Control /Remote Desktop Server UART ESP32-P4-NANO Development Board RISC-V WiFi6 MIPI CSI Camera / 10.1 inch DSI Display / USB / RJ45 Ethernet / POE / Audio Buzzer NVIDIA Jetson TX2 NX Module Raspberry Pi 5 SSD ADXL354C Development Board LuckFox Pico User Guide Orange Pi Zero 3 Banana Pi Milk V Industrial Isolated USB TO 4CH RS485 (B) Converter UART CH344L For Wall/Rail-Mount

Arduino Uno R3 Hardware Reference

UNO R3 Development board Case ABS UNO R3 case for Arduino