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： Milk V Duo UART ESP32-S3 AI Electronic Eye Development Doard DualEye TouchEye 1.28 inch TouchScreen LCD Round Display N16R8 Toy Doll Robot 2.13Inch E-Paper Raspberry Pi Pico 2 RP2350 GEEK 1.14 inch LCD 240x135 65K SWD/UART/I2C For OpenOCD/CMSIS-DAP ESP32-S3 1.28inch Round LCD Computer GPUCPU Monitor Screen Sipeed NanoKVM-USB Finger-sized 4K USB KVM for Server/SBCs Raspberry Pi 5 ESP32 C3 LCD Development Board 1.3 inch Display Screen ST7789 240x240 3D Transparent Refractive Prism Mini TV For Arduino Spotpear Raspberry Pi 5 Serial 1.54 inch Passive NFC e-Paper BW Display E-ink Screen No Need Battery Wireless Powered & Data Transfer BPI ESP32 C3 MINI TV Modbus RTU Relay 32CH Code TVOC Sensor gas Sensor Expansion board UART High Sensitivity For Arduino /Raspberry Pi /Pico /ESP32 LCD1602 I2C Module PWM Adjustable backlight 3.3V/5V For Arduino/ Raspberry Pi/ Pico/ Jetson Nano/ ESP32 ESP32 Portable Pendant 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

Arduino Uno R3 Hardware Reference

UNO R3 Development board Case ABS UNO R3 case for Arduino