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： Bus Servo DC-BUCK-Adapter 7.2V Voltage mini module For SC15/SC09 Servo Jetson Nano Case RS485 to Ethernet Jetson RTL8822CE 5GHz WiFi Wireless Bluetooth5 Card NGFF-M.2 RTL8822CE-CG Core Luckfox Pico Pro Computer Monitor Screen SP3232EEN Servo PWM motor WP5320 WP5335 35/20KG.CM 180° PWM digital servo double ball bearings Raspberry Pi LCD Capacitive TouchScreen Display HDMI 6.25inch 720x1560 ESP32-S3 AI Voice Images Chat Robot Electronic PhotoPainter Frame E-Paper Ink Screen 7.3-inch E6 Full-Color Deepseek Development Board ESP32-S3 GEEK Arduino Thermal imaging camera Raspberry Pi 7 inch CAPLCD 1280x800 Capacitive TouchScreen HDMI/Type C Display Monitor For Computer mini PC ESP32-S3 Industrial 8-Channel Controller with WiFi Bluetooth CAN IoT RS485 and RJ45 ETH POE ESP32 C3 ST7789 Raspberry Pi Triple LCD HAT Milk-V Duo PI5 Case WiFi6 Pi5 Pure-Copper Active Cooler

Arduino Uno R3 Hardware Reference

UNO R3 Development board Case ABS UNO R3 case for Arduino