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 RP2040 Raspberry Pi DSI Raspberry Pi 5 PCIe to M.2 NVMe SSD Adapter Board (D) HAT Pi5-2280-2242-2230 SpotPear Raspberry Pi 5 ABS Case 800x480 Raspberry Pi PICO Milk-V Duo Tutorial ESP32-C5 WIFI6 Development Board ESP32-C5-WROOM-1 N16R4/N16R8 Python UART Communication Raspberry Pi 5 PCIe TO Gigabit RJ45 ETH Adapter Board (C) Driver-Free RTL8111H For Pi5 Magnetic Encoder Servo Motor 45KG.CM 24V 360° RS485 High Precision And Large Torque ESP32 S3 Development Board 2.1 inch Round Rotary Knob LCD Smart Screen 2.1inch Display 480x480 LVGL for Arduino USB-CAN-B OLED-LCD-HAT-A user guide Thermal imaging camera Arducam Serial UART Bus Servo CF35-12 TTL 35KG.CM Magnetic-Encoder High precision and Large torque Raspberry Pi Raspberry Pi 5 PCIe to 2-CH PCIe FFC Dual PCIe HAT Board Pi5 Double

Arduino Uno R3 Hardware Reference

UNO R3 Development board Case ABS UNO R3 case for Arduino