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： Rasberry Pi 5 PCIe TO MiniPCIe 4G Gigabit Ethernet RJ45 USB HUB HAT+ SIM7600G-H/EG25-G Raspberry Pi IR Thermal Imagi ADXL354C Sensor RISC-V Type-C Power Adapter Raspberry Pi 5 PD Power Raspberry Pi Pico 2 RP2350 ETH CH9120 TCP/UDP Ethernet Network For Arduino Raspberry Pi HQ Camera Official Original High Quality For M12 Lenses 12.3MP IMX477 Sensor spotpear DDSM315 Direct Drive Servo Motor All-In-One Design Hub RS485 Motor Sipeed NanoCluster Mini Cluster Board mini data center For Raspberry Pi CM45 / Computer /LM3H /M4N RS232 to RS422 Raspberry Pi 5 HDMI to RGB Finger Vein Scanner Module (A) Cortex M4F UART 3.3V TTL UL94-5VB IP56 Better Than Fingerprint Recognition Industrial 4-ch RS485 DC Detection Module Modbus RTU DIN Rail and Audio Speaker Raspberry Pi 5 Jetson Nano Case TOF Time of Flight Laser Range Sensor Mini Radar module UART Serial / I2C Port For Arduino / Raspberry Pi / ESP32

Arduino Uno R3 Hardware Reference

UNO R3 Development board Case ABS UNO R3 case for Arduino