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： Sipeed-Lichee-Tang-Nano-FPGA-Series-IDE-Install NVIDIA Jetson Orin Nano Developer Kit Official Original 8GB AI 40Tops For Embedded and Edge Systems Raspberry Pi Pico 2 RP2350 1.64 inch AMOLED Development Board Display TouchScreen 280x456 QMI8658 IMU QSPI Raspberry Pi UGV Beast ROS2 PT AI OpenCV Robot Car MediaPipe USB-CAN-B Milk V Duo Raspberry Pi 5 / 4B UPS With PD Trigger Activation Uninterruptible Power Bank Supply 9600mAh 5V/5A 25W Also For Phone/Mini Computer PC Raspberry Pi 5 POE + PCIe to M.2 NVMe SSD Board HAT+ Pi5 2242/2230 Power over Ethernet ESP32 ST7789 Raspberry Pi 4 USB Audio Raspberry Pi 5 PCM5122 I2S Audio Card DAC Also For PI4 /PI3 /Zero Series ESP32-C3FN4 Raspberry Pi 8 inch DSI MIPI LCD TouchScreen Display 8inch 800x1280 For Luckfox Lyra RK3506/ESP32-P4/Luckfox Omni3576 FT4232HL USB TTL RS232 Industrial UART 4-Ch UART Raspberry Pi 1.3inch IPS LCD display HAT Raspberry Pi 5 ABS Case ST servo driver ESP32 MLX90640 Milk-V Duo S Extend Partition on SD Card or eMMC Gyroscope Sensor

Arduino Uno R3 Hardware Reference

UNO R3 Development board Case ABS UNO R3 case for Arduino