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： Jetson 1.5inch LCD Raspberry Pi 21.5inch FHD LCD 1080x1920 Capacitive TouchScreen Display For Raspberry Pi/Jetson Nano/ Metal Case ESP32-S3 GEEK Development Board Raspberry Pi PICO Long-Range Communication Industrial USB to RS485 Converter Raspberry Pi Pico 2 RP2350A 1.54inch TouchScreen 1.54 inch ePaper Display Development Board 200×200 Spotpear Raspberry Pi SIM7670G LTE-4G-Cat-1/GNSS/USB-HUB Expansion Board 0.96inch RGB OLED ESP32-S3 Industrial 8-Channel Controller with WiFi Bluetooth CAN IoT RS485 and RJ45 ETH POE Raspberry Pi 18.5inch FHD LCD 1920x1080 Capacitive TouchScreen Display For Raspberry Pi/Jetson Nano/ Arducam 64MP Camera Industrial CAN FD ETH RJ45 bidirectional converter CAN2.0A/2.0B 1.38MP Global Shutter Camera ISG1321 For Luckfox Pico Zero AI Board Luckfox PicoKVM KVM NanoKVM RV1106 Pico Remote Control /Power /Desktop Maintenance Server HDMI USB For PiKVM Raspberry Pi USB-CAN-B Milk V Raspberry Pi Mini

Arduino Uno R3 Hardware Reference

UNO R3 Development board Case ABS UNO R3 case for Arduino