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： ST servo driver Computer Raspberry Pi5 PCIe TO M.2 MINI Support Gen2 and Gen3 SSD Compatible 2230 2242 CAM-GC2083 Spotpear Raspberry Pi Pico 2 RP2350B 4.3inch Capacitive TouchScreen 4.3 inch LCD Display Development Board 800×480 Install Espressif IDF Plugin Tutorial User Guide Raspberry Pi 5 PCIe to M.2 Mini NVMe SSD Board (E) With Customized Active Cooler Together SpotPear USB to I2C Arducam SC09 Serial UART Bus Servo Motor Switchable 2.3kg 300Angle Raspberry Pi Pico 2 RP2350 1.28 inch Round LCD Development Board 240x240 Display Screen QMI8658 6-Axis Raspberry Pi CM5 Compute Module 5 Development Kit With CM5104032 + Official Original IO Board + Case Arducam ESP32-S3 AI Electronic Eye Development Doard DualEye TouchEye 1.28 inch TouchScreen LCD Round Display N16R8 Toy Doll Robot Raspberry Pi Autofocus Camera 64MP Camera Industrial Modbus RTU 8 ch Relay Module MEGA2560 R3

Arduino Uno R3 Hardware Reference

UNO R3 Development board Case ABS UNO R3 case for Arduino