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： NV3030B Milk V Duo Raspberry Pi PICO LoRa Wiki Industrial ESP32 S3 AI 7inch (C) Development Board 7 inch TouchScreen Display Sensor DeepSeek XiaoZhi AI Voice Chat Robot BOX ESP32-S3 Development Board 1.85 inch Round LCD N16R8 Industrial ESP32-S3 Relay 8-Channel 8-Ch ESP32-WROOM IOT WiFi Bluetooth HAT For Arduino White Raspberry Pi 5 PD Activation Raspberry Pi 5 USB A C Mini PD Trigger Activation Power Adapter To Solve Non-PD-Power system error warning DDSM315 Direct Drive Servo Motor All-In-One Design Hub RS485 Motor Raspberry Pi 12.3 inch HDMI LCD Captive TouchScreen Display 1920x720 For Jetson Series/Computer PC ESP32 ST7789 Serial UART Bus Servo CF35-12 TTL 35KG.CM Magnetic-Encoder High precision and Large torque Raspberry Pi Pico NVIDIA ESP32 C6 AI 0.85inch Development Board 0.85 inch DeepSeek RGB surround light Dual mike Industrial Isolated RS485 TO ETH (C) RJ45 Converter Wall/Rail-Mount For Modbus LuckFox Raspberry Pi 5

Arduino Uno R3 Hardware Reference

UNO R3 Development board Case ABS UNO R3 case for Arduino