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： Changeable Photo Frames Arduino MLX90641 MAX9296 GMSL Camera Adapter Board 2-Ch High-Speed And Low-Latency Transmission For Jetson Orin Nano/NX Raspberry Pi 5 PCIe to M.2 Mini NVMe SSD Board (E) With Customized Active Cooler Together Arduino MLX90640 R7FA4 PLUS B Development Board Based on R7FA4M1AB3CFM Compatible with Arduino UNO For R4 WiFi Raspberry Pi 5 inch DSI MIPI Display LCD (D) Capacitive TouchScreen 720x1280 Sipeed Lichee Tang Nano 20K FPGA RISCV Open-Source Retro-Game Linux MINI Development Board GW2AR-18 Laser 450nm 5W high precision module Adjustable focal length For Laser Carving / Laser 3D Printing RS485 to Ethernet Computer USB Monitor Screen Jetson 64MP Camera Raspberry Pi CM5 Mini Base IO Board NANO A Development For Compute Module 5 Raspberry Pi 5 PD Activation Module ESP32 Development Board WiFi+Bluetooth Ultra Low Power Dual Core ESP 32S ESP 32 Similar ESP8266 Milk-V Duo S User Guide Total ESP32 C3 1.44inch LCD JETSON NANO Modbus RTU Relay 32CH Milk-V Duo S 512MB SG2000 RISC-V

Arduino Uno R3 Hardware Reference

UNO R3 Development board Case ABS UNO R3 case for Arduino