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： Spotpear Raspberry Pi Pico Milk-V Duo S Usage of USB Type A interface DeepSeek AI Voice Chat ESP32 S3 Development Board 1.8 inch AMOLED Display 368×448 1.8inch TouchScreen Programmable Watch QMI8658 /MIC /Audio /Battery STLINK Raspberry Pi DSI X1200 Raspberry Pi 5 UPS Board Uninterruptible Power Supply For 18650-Li-Battery (NOT includ) Raspberry Pi DSI Scr Tang Nano Series FPGA FAQ AV to RGB STM32 1.5inch LCD Milk-V Duo Camera Tutorial Core3566104000 ESP32-S3 ST7789 IPS Raspberry Pi 5 Luckfox Raspberry Pi display Raspberry Pi 5 PCIe To M.2 E KEY NGFF WIFI7 WIFI6 For BE200/AX210/AX200/RTL8822CE Raspberry Pi Camera

UNO R3 Development board Case ABS UNO R3 case for Arduino

TAG： IMX477 IR CUT Camera12.3MP Jetson Nano Orin Raspberry Pi ESP32 S3 4.3inch LCD 800x480 Captive TouchScreen Display Board LVGL Sensor CAN I2C RS485 Jetson Nano ESP32 S3 22Pin to 15Pin Cable Milk-V Duo ESP32-S3 1.28 AI Machine Vision Kit OAK D S2 POE JPEG Encoder 12MP 4TOPS OpenCV Camera RM500Q GL IoT EMBB 5G 4G 3G M.2 LTE-A/NSA SA GNSS DFOTA VoLTE Quectel spotpear Raspberry Pi Starlight Camera IR-CUT IMX462 ESP32 Milk-V Duo Camera PC USB Monitor Screen ESP32-S3 1.28inch Round LCD 16mm Telephoto Lens Raspberry Pi High Quality Camera Global Shutter XIAO ESP32S3 Plus SeeedStudio N16R8 ADXL354C Dev Board USB to nRF24L01 RAM Monitor Screen