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： Luckfox Pico RJ45 Milk-V Duo Ethernet How to install Esp32 by espressif systems Raspberry Pi 11.6 inch LCD HDMI /Type C Display In-Cell Capacitive TouchScreen 1768x828 For Jetson Nano/mini Computer PC PI5 ESP32 S3 N16R8 Development board 1.9 inch LCD Display 1.9inch TouchScreen 170&times;320 SD-Port RGB LED QMI8658 6-Axis ST7789 CST816 Raspberry Pi Compute Module 4 CM4 IO Board Dual Gigabit Ethernet Mini Router Board RM520N GL 5G/4G/3G M.2 Moudle IoT EMBB For LTE-A/NSA/SA And GNSS For DFOTA /VoLTE For Quectel ADXL354BEZ Day and IR Night Vision LuckFox Raspberry Pi 5 Official Original PCIe to M.2 HAT+ Compact Expansion Board NVMe SSD Raspberry Pi 15.6 inch QLED Quantum Dot Display 1920x1080 Capacitive Touchscreen For Computer PC/Jetson/Game $167.99 Raspberry Pi 5 Fan Raspberry Pi 5 PD Power Cortex-A7 PoE-M.2-HAT+B User Guide Raspberry Pi Pico 2 RP2350B 4.3inch Capacitive TouchScreen 4.3 inch LCD Display Development Board 800×480 ESP32-S3 Industrial 8-CH Relay IOT LAN WiFi /Bluetooth /CAN /RJ45 Ethernet /POE ADXL357BEZ

Arduino Uno R3 Hardware Reference

UNO R3 Development board Case ABS UNO R3 case for Arduino