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： ESP32-P4-ETH RJ45 POE DSI/MIPI 10.1 inch LCD Display Touchscreen/CSI Camera/Audio Speaker AI Deepseek UART TTL To RS485 C Built-In Protection Circuits Raspberry Pi 5 Sipeed NanoKVM-USB Finger-sized 4K USB KVM for Server/SBCs Raspberry Pi 5 RTC Luckfox Pico LCD Magnetic Encoder Servo Motor 45KG.CM 24V 360° RS485 High Precision And Large Torque Finger Vein Scanner Module (B) Cortex M4F UART serial port EAL4+ security certification qualification Jetson 1.5inch LCD CAM-GC2083 RP204 0.85inch LCD ESP32-S3 1.28inch LCD Milk-V Duo ESP32 S3 AI 1.75 inch Development Board with 1.75inch AMOLED Touchscreen Round Screen Deepseek Onboard ESP32-C6 Development Board STM32 downloader Industrial USB TO 4CH RS232/485/422/TTL Serial UART Converter FT4232HL Multi Protection ESP32-AI Series User Guide Jetson Orin Uninterruptible Power C For Simultaneously Charging and Discharging

Arduino Uno R3 Hardware Reference

UNO R3 Development board Case ABS UNO R3 case for Arduino