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： Raspberry Pi 5 UART ESP32 1.54inch OLED Program SpotPear HDMI to TTL Industrial USB TO 8CH TTL Converter USB to UART Multi Protection Circuits Multi Systems Integrated capacitive fingerprint module Cortex core UART serial port High-precision fingerprint recognition LCD Screen 7inch-DSI-LCD-H User Guide SpotPear NVIDIA Jetson Orin Nano/NX PoE Mini Expansion Board Power over Ethernet RJ45 802.3af compliant Raspberry Pi 0.96inch LCD JETSON NANO Spotpear 8.8inch LCD 1920x480 Computer PC Monitor Display Secondary Screen TypeC USB CPU RAM Raspberry Pi Touch Display 2 Official Original Capacitive TouchScreen 7 inch LCD TFT 720x1280 ESP32 C3 LCD Development Board 1.3 inch Display Screen ST7789 240x240 3D Transparent Refractive Prism Mini TV For Arduino 0.96inch RGB OLED Core3566102032 RP2040

Arduino Uno R3 Hardware Reference

UNO R3 Development board Case ABS UNO R3 case for Arduino