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： VGA to TTL ESP32-C6 1.64inch AMOLED Display Development Board 280×456 1.64 inch TouchScreen RP204 0.85inch LCD Raspberry Pi MLX90640 0.85inch LCD Pi5 ESP32-S3 AI Dancing Robot Development Board Chatbot AI Toy Desktop Dance Pet ESP32-S3 LCD Driver Board RGB/SPI N8R8 For 2.1/2.8/4inch Captive TouchScreen Display Round Raspberry Pi LCD display screen 1.3inch ST7789 with Game Button A X1006 Raspberry Pi 5 PCIe To 2.5 SATA And M.2 KEY-B 2280 SSD/HDD Double-SATA (NOT BOOT From SATA/SSD Luckfox Sipeed NanoKVM Cube KVM HDMI Remote OS Control Manager Install /Power Control /Remote Desktop Server UART Raspberry Pi 1.54 inch e-Paper HAT+ (E) E-Ink E6 Full color 240x240 Screen Display For Arduino /STM32 /ESP32/Jetson Nano 800x480 ESP32-S3 LCD ESP32-P4 AI Development Board 7/8/10.1inch HMI Touch Screen All-in-One Compatible with Deepseek ESP32-C6 Development Board LuckFox Pico Mini Core3566104000 ESP32-S3 LCD Mini tiny Development Board 0.85 inch Display 0.85inch Screen 128x128 SD-Port For Arduino

Arduino Uno R3 Hardware Reference

UNO R3 Development board Case ABS UNO R3 case for Arduino