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 DS3231 PCIe M.2 NVMe Dual SSD Attitude Sensor LCD Screen Driver Board Raspberry Pi 13.3 inch FHD Monitor LCD 1080P Capacitive TouchScreen Display Type-C/HDMI For Computer PC Raspberry Pi 5 inch DSI MIPI Display LCD (D) Capacitive TouchScreen 720x1280 Luckfox 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 MP2.5G Raspberry Pi 5 PCIe to 2.5G Ethernet HAT Pi5 RTL8125 Raspberry-Pi-Game-1.54inch-LCD-touchscreen-display-ST7789 RS232 to RJ45 Milk-V Duo Tutorial Industrial-grade isolated 4-way RS485 hub repeater One RS485 TO Four RS485 Raspberry Pi 5 Camera User Guide Raspberry Pi USB Camera 5MP OS05A10 Distortion-Free USB 2.0 For Jeston RDK spotpear Core3566002000 Raspberry Pi Camera VGA to RGB ESP32-S3 1.28inch LCD

Arduino Uno R3 Hardware Reference

UNO R3 Development board Case ABS UNO R3 case for Arduino