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： DeepSeek AI Voice Chat ESP32 S3 Development Board 1.8 inch AMOLED Display 368×448 1.8inch TouchScreen Programmable Watch QMI8658 /MIC /Audio /Battery XIAO RA4M1 Tiny SuperMini Board For Arduino Uno IDE For SeeedStudio R7FA4M1 Pi5 Double 2280 Raspberry Pi 64MP Camera Digital Photo Luckfox Pico PLUS Raspberry Pi Pico 2 RP2350B RP2350-PiZero Development Board PSRAM DVI For HDMI RP2040 Raspberry Pi LCD Display Screen 1.3inch LCD with Game Button AND Audio Buzzer For Zero 2W / 3B / 4B / PI5 / RP2040-PiZero Raspberry Pi Camera Arducam User Guide waveshare Step Recording and Reproduction Core3566004032 Image extraction User Guide Industrial CAN FD RS232/RS485 bidirectional converter CAN2.0A/B SIM8260G M2 3G/4G/5G/GNSS/GPS Sub-6G PCIe M.2 Moudle For LTE-A/NSA/SA For DFOTA /VoLTE For SIMCOM Arducam Raspberry Pi 5 PCIe to 2.5G Ethernet Adapter Board Plug and Play

Arduino Uno R3 Hardware Reference

UNO R3 Development board Case ABS UNO R3 case for Arduino