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： Python UART Communication 1.83inch LCD TouchScreen Display 240×284 ST7789P For Arduino /Raspberry Pi /ESP32 /Pico /STM32 Milk-V Duo Camera Tutorial Industrial Modbus RS485 RTU 8-ch Magnetic Latching Relay Module (C) With Digital Input ESP32-C6 Zero B Mini Wide Voltage Board Supports WiFi 6 and Bluetooth 5 SpotPear ESP32 S3 Development Board 1.85 inch Round LCD Display 360&amp;amp;times;360 QMI8658 Sensor / MIC / SD /MP3 Audio /Battery Port LVGL/HMI For Arduino Arduino Thermal imaging Code NanoKVM-Lite Raspberry Pi Pico 2 RP2350A 1.54inch TouchScreen 1.54 inch ePaper Display Development Board 200×200 RISC-V Raspberry Pi 5 PCIe to M.2 SSD Digital Input Raspberry Pi IR Array Thermal Imaging Camera Far infrared 80×62 Pixels 45/90 Degree FOV ESP32-C6 LCD Development Board 1.3 inch Display 1.3inch Screen ST7789 240x240 Mini TV SD-Port QST LVGL For Arduino Tutorial ESP32 P4 Development Board 7inch Display 7 inch TouchScreen Onboard ESP32-C6 Camera 1024×600 Raspberry Pi RP2040 Raspberry Pi Pico W

Arduino Uno R3 Hardware Reference

UNO R3 Development board Case ABS UNO R3 case for Arduino