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： Raspberry Pi Industrial 10.1 inch DSI LCD HMI TouchScreen MIPI Display 1280x800 10.1inch One-Body PC With Front Camera For Pi 4/5 TOF Time-Of-Flight Laser Range Sensor Radar Module UART / I2C Port waveshare Bus servo driver board X1203 Raspberry Pi 5 UPS Board Uninterruptible Power Supply For Li-Battery (NOT includ) Pi 5 PCIe to M.2 NVMe SSD Board Raspberry Pi 3.97 inch e-Paper link (G) RYBW 800x480 For Arduino / Jetson / STM32 /ESP32 Arduino IR Thermal Imaging Camera RP2040 LoRa-HF Raspberry Pi 1.54inch LCD Bookworm-Desktop Display and Touch Raspberry Pi Raspberry-Pi-A7670E-GSM-GPRS-GNSS-LTE-Cat-1-2G-A-User-Guide ESP32-S3 LCD ESP32 S3 LCD Development Board 1.3 inch Display 1.3inch Screen ST7789 240x240 Mini TV SD-Port QST QMI8658 Gyro Sensor LVGL For Arduino Raspberry Pi 3.5 inch LCD F Display Capacitance TouchScreen 60fps ST7796 GT911 320x480 Also For Arduino/Pico2/ESP32/RP2040/RP2350 RS232/485/422 To CAN Raspberry Pi USB Global Shutter Camera 1MP OV9281 120fps Black/White 120fps also For Jeston RDK Good low light performance Raspberry Pi PICO JETSON NANO

Arduino Uno R3 Hardware Reference

UNO R3 Development board Case ABS UNO R3 case for Arduino