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： SPI Communication Milk V Orange Pi Zero 3 Jetson Nano Fan ESP32-S3 LCD Driver Board RGB/SPI N8R8 For 2.1/2.8/4inch Captive TouchScreen Display Round Raspberry Pi RP2040 Long-Rang Raspberry Pi Pico 2 RP2350 Core A Development Board RP2350A ESP32-S3 Development Board 4 inch LCD TouchScreen Display 480x480 RS485 /SHT20 /Relay For Arduino LVGL 86 TVbox ESP32 IR Thermal Imaging Camera PI5 Jetson Orin Uninterruptible Power C For Simultaneously Charging and Discharging ESP32-S3 SIM7670G 4G Development Board With Camera LTE Cat-1/4G/GNSS/GPS Global Band Portable WIFI Raspberry Pi Pico 2 RP2350 USB A Development Board RP2350A Sipeed NanoKVM Cube KVM HDMI Remote OS Control Manager Install /Power Control /Remote Desktop Server UART Raspberry Pi Pico 2 Pro RP2350A Linux PSRAM-8MB Development Board Display TouchScreen Camera Raspberry Pi CM5 Mini Base IO Board NANO A Development For Compute Module 5 ADXL354CZ EVAL BOARD Bus Servo Adapter A Jetson Orin 4G/3G/2G expansion board GNSS GPS SIM7600G-H-M.2 1.38MP Global Shutter Camera ISG1321 For Luckfox Pico Zero

Arduino Uno R3 Hardware Reference

UNO R3 Development board Case ABS UNO R3 case for Arduino