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： IR Thermal Imaging Camera ESP32-P4-NANO Development Board RISC-V WiFi6 MIPI CSI Camera / 10.1 inch DSI Display / USB / RJ45 Ethernet / POE / Audio Buzzer Raspberry Pi 5 ESP32-P4 Module Core Board PSRAM 32MB Flash 16MB N16R32 Onboard ESP32-C6 ESP32 1.5inch LCD Raspberry Pi Pico RP2040-LCD-0.96 User Guide Arduino MLX90640 Raspberry Pi 10.1 inch QLED Quantum Dot Display 1280x720 Capacitive Touchscreen DDC/CI For Computer PC/Jetson/Game Attitude Sensor Electronic EYE 0.71 inch Round LCD Display Screen For Arduino Raspberry Pi ESP32 Pico STM32 Raspberry Pi DA7212 I2S Audio For XiaoZhi AI Expansion Board Dul-mic Free-Driver For PI5/PI4/Zero Raspberry Pi 5 UPS HAT E 4-Port For 21700-Li-Battery (NOT includ) 5V6A Uninterruptible Power Supply Raspberry Pi 5 Active Cooler Raspberry Pi 64MP Camera DeepsSeek XiaoZhi AI Voice Chat ESP32-S3 1.54 inch LCD Kit N16R8 WROOM-1-N16R8 DevKitC-1 Development Board MLX90641 Industrial RS485 Modbus RTU Relay ESP32 S3 Development Board 2.8 inch Round LCD Display 480x480 QMI8658 Sensor / SD /MP3 Audio /Battery Port LVGL/HMI For Arduino Raspberry Pi 5 Case 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