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： RS232 to CAN PI5 Raspberry Pi 5 Argon-NEO-M.2-NVME-PCIE-Expansion-Board Only For Argon NEO 5 Case (Not include) RS485 TO Relay ADXL354C ESP32-S3 MAX AI Camera 3.5inch LCD Dual MIC Development Board Display 320x480 3.5 inch TouchScreen Voice Interruption Object Recognition Raspberry Pi 5 PCIe to M.2 5G/4G/3G HAT With RM520N-GL FT4232HL USB TTL RS232 Industrial UART 4-Ch UART Raspberry-Pi-1.54inch-LCD-Display-Touchscreen-configuration-Bookworm-Lite For Pi5 RV1103 SC3336 luckfox-pico-ultra-w-gpio Use CSI Camera ESP32-P4-WIFI6 5inch LCD Display AI Development Board 720×1280 5 inch TouchScreen Deepseek ESP32-S3 AI RGB Matrix Driver Board Dual Microphone DeepSeek Raspberry Pi 5 Case UART To Ethernet LuckFox Pico Digital Photo Frames AI Machine Vision Kit OAK-D-POE JPEG Encoder 12MP IP67 Waterproof 4TOPS OpenCV Camera Bevelopment Board

Arduino Uno R3 Hardware Reference

UNO R3 Development board Case ABS UNO R3 case for Arduino