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： Raspberry-Pi-Game-1.54inch-LCD-touchscreen-display-ST7789 DeepSeek AI Voice Chat Camera Robot BOX ESP32-S3 Development Board 2 inch LCD N16R8 Touchscreen Display Camera Sipeed MaixCAM SG2002 RISC-V AI Camera Kit with Screen Audio WIFI6 Linux Board Raspberry Pi 4B How to install Esp32 by espressif systems Raspberry Pi Pico 2 RP2350A Zero-CM Mini Board Raspberry Pi UGV Beast ROS2 PT AI OpenCV Robot Car MediaPipe ESP32 UART To CAN SpotPear Raspberry Pi ST7789 ESP32-C6 Geek 1.14inch Development Board with 1.14 inch 65K Color LCD Jetson Nano Case Round Rotary LCD touch screen 1.28inch 1.6inch 2.1inch Knob central control lighting LCD Raspberry Pi MLX90640 3.4inch Round LCD HDMI Capacitive Touchscreen Display 800x800 For Raspberry Pi/Jetson Nano/mini PC Jetson Orin 5G/4G/3G expansion board GNSS GPS RM520N-GL 7inch Monitor LCD Raspberry Pi 5 UART Raspberry Pi Pico 2 RP2350A Audio Box 1.85-inch LCD Round 1.85inch TouchScreen Speaker 360x360

Arduino Uno R3 Hardware Reference

UNO R3 Development board Case ABS UNO R3 case for Arduino