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： Arduino 1.5inch LCD Sipeed SLogic 4IN1 USB Logic Analyzer 80M / DAPLink / CKLink Debugger Tool / UART Module Raspberry Pi 7 inch QLED Quantum Dot Display 1024x600 Capacitive Touchscreen For Computer PC/Jetson/Game Jetson Orin Nano UGV Beast PT ROS2 AI OpenCV Robot Car MediaPipe Raspberry Pi 5 PD Power Raspberry Pi 5 PCIe TO Gigabit ETH USB3.2 HAT+ USB HUB Raspberry Pi Pico 2 RP2350 1.28 inch Round LCD TouchScreen Development Board 240x240 Display QMI8658 6-Axis $17.9 Raspberry Pi Pico 2 RP2350/RP2040 W5100S-EVB-Pico W6300-EVB-Pico2 Ethernet Development Board ETH RJ45 Luckfox Pico RJ45 Industrial USB to RS485 Converter RS485 Bus Spotpear Raspberry Pi MPTPU Raspberry Pi 5 TPU AI Kit 2TOPS PCIe to TPU HAT Pi5 For Google Coral Edge TPU NVIDIA Jetson Orin Nano 4/8GB AI 20/40Tops Lower Power Autonomous Machines Argon ESP32 Google Dinosaur game Program Raspberry Pi Pico 2 RP2350 ETH CH9120 TCP/UDP Ethernet Network For Arduino ESP32-S3FH4R2 Matrix 8x8 RGB-LED-WiFi Bluetooth QST Attitude Gyro Sensor QMI8658C Arduino Python

Arduino Uno R3 Hardware Reference

UNO R3 Development board Case ABS UNO R3 case for Arduino