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 Pico development board RP2040 Core A Based On Official RP2040 Dual Core Processor ESP32-S3 SIM7670G 4G Development Board With Camera LTE Cat-1/4G/GNSS/GPS Global Band Portable WIFI ESP32 S3 4.3inch LCD (B) 800x480 Captive TouchScreen Display Board LVGL with Sensor CAN I2C RS485 Pan-Tilt Kit X1015 Raspberry Pi 5 PCIe to M.2 Key-M NVMe SSD Board Pi5 2280 HDMI to LVDS Raspberry Pi 5 8mp Camera X1011 Raspberry Pi 5 PCIe to M.2 NVMe 4-Ports SSD Board HAT Pi5 Four-Times 2280 MP2.5G Raspberry Pi 5 PCIe to 2.5G Ethernet HAT Pi5 RTL8125 English Character Display Principle Raspberry Pi 5 NVMe ESP32 S3 Development Board 1.85 inch Round LCD Display 360&amp;amp;times;360 QMI8658 Sensor / MIC / SD /MP3 Audio /Battery Port LVGL/HMI For Arduino Raspberry Pi Pico 2 RP2350A Audio Box 1.85-inch LCD Round 1.85inch TouchScreen Speaker 360x360 NVIDIA Jetson Orin Nano Developer Kit Official Original 8GB AI 40Tops For Embedded and Edge Systems Raspberry Pi 5 DSI User Guide Raspberry Pi CM5 Mini Base IO Board NANO A Development For Compute Module 5 JSON Command Meaning Raspberry Pi 64MP Camera Finger Vein Scanner Module (A) Cortex M4F UART 3.3V TTL UL94-5VB IP56 Better Than Fingerprint Recognition Tang Nano Series FPGA FAQ

Arduino Uno R3 Hardware Reference

UNO R3 Development board Case ABS UNO R3 case for Arduino