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： LCD Screen Driver Board CSI Camera Modbus RTU 8-ch Relay Module (D) Computer GPUCPU Monitor Screen NanoKVM-USB-Development Tang Nano Series FPGA FAQ Raspberry Pi Camera Module 3 Sensor Assembly IMX708 Official Original 11.9MP Camera Raspberry Pi Pico 2 RP2350 industrial 6-ch Relay RS485 isolation protection Raspberry Pi DS3231 Raspberry Pi CM5 Official Original IO Board a Base Development Platform Compute Module 5 IO Board PCB800099 Raspberry Pi 5 inch DSI Display MIPI LCD (C) Capacitive TouchScreen 1024x600 Arducam 64MP Camera ESP32-S3 1.28inch LCD Wireless AW CB375N 2.4G/5GHz Dual Band WiFi5 Wireless module RTL8822CE CG Bluetooth 5.0 pcb800099-v.9 Raspberry Pi 8.8 inch DSI MIPI Display LCD Capacitive TouchScreen 480x1920 Sipeed NanoKVM Cube KVM HDMI Remote OS Control Manager Install /Power Control /Remote Desktop Server UART ISX031C GMSL Camera H100 Image Sensor IP67 protection rating For Jetson Orin And MAX9296 GMSL camera Raspberry Pi 5 NVMe

Arduino Uno R3 Hardware Reference

UNO R3 Development board Case ABS UNO R3 case for Arduino