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： 800×480 Industrial USB HUB USB3.2 Gen1 One-To-4U Onboard 7~36V DC power port For Multi Systems Raspberry Pi 4/4.3 inch DSI MIPI LCD TouchScreen Display 4/4.3inch 480x800 For Luckfox Lyra RK3506/ESP32-P4/Luckfox Omni3576 User Guide Sipeed-Lichee-Tang-Nano-FPGA-Series-IDE-Install ESP32-S3 USB Dongle ESP32 C3 1.44inch LCD Modbus-Protocol-Specification User Guide Raspberry Pi Pico ST7789 ESP32 C6 Development Board 1.47 inch LCD Touch Screen 1.47inch Display 172&times;320SD AXS5106L JD9853 Luckfox Pico Pro Raspberry Pi Autofocus Camera ESP32 Thermal imaging camera Luckfox Pico Max 3D Display Transparent Screen Servo Raspberry Pi 1.54inch LCD Bookworm-Desktop Display and Touch DeepSeek XiaoZhi AI Voice Chat Robot BOX ESP32-S3 Development Board 1.85 inch Round LCD N16R8 Industrial Grade ETH Ethernet 8-Channel Relay Module ESP32 LVGL

Arduino Uno R3 Hardware Reference

UNO R3 Development board Case ABS UNO R3 case for Arduino