Product Overview
Arduino UNO R3 Original
The
Arduino Uno R3
is a microcontroller board
based on the ATmega328P chip
.
This board
has 14 digital I/O pins
(6 support PWM),
6 analog inputs
, a
16 MHz crystal resonator
, a USB connector, a power jack, an ICSP header, and a reset button. You may quickly charge it with a USB cable, adapter, or battery.
The Uno R3 is
designed for both students and enthusiasts
and makes electronics and coding accessible without requiring extensive technical knowledge.
This Arduino UNO microcontroller board
can be programmed using the Arduino IDE
, which allows users to build sketches (code) that control the board. Even if something goes wrong, simply change the chip and restart.
"Uno" means "one" in Italian, and it marks the release of the Arduino IDE 1.0. It became the standard and reference model for subsequent Arduino boards.
Common uses of the Arduino Uno board include home automation, industrial control, and DIY electronics projects.
It can also interface with other Arduino boards or Raspberry Pi, making it a flexible choice for creators and students.
Check out the original
Arduino UNO R4 WiFi
!
Read our blog
IR sensor Arduino code
for interfacing IR sensor module with Arduino.
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Arduino
products.
Key Features
ATmega328P microcontroller ensures reliable and efficient performance
Includes 14 digital input/output pins, with 6 supporting PWM output
Features 6 analog input pins for reading sensor or variable data
Equipped with a 16 MHz ceramic resonator for stable timing
Offers 32 KB flash memory (0.5 KB used by bootloader), 2 KB SRAM, and 1 KB EEPROM
Can be powered via USB, DC adapter (7–12V recommended), or battery
Integrated USB-to-serial communication using ATmega16U2 for easy programming
Built-in resettable polyfuse provides protection against USB overcurrent
Supports automatic reset for quick and easy code uploads
Includes an onboard LED on digital pin 13 for basic testing
Supports serial (UART), SPI, and I2C communication protocols
Compatible with a wide range of Arduino shields for project expansion
Easy to use, making it perfect for beginners and DIY electronics enthusiasts
Arduino UNO Pin Diagram
The power pins are as follows:
Pin
Description
Vin
The input voltage to the Arduino board when using an external power source (7–12V). You can supply voltage through this pin, or access it if supplying voltage via the DC power jack.
5V
Outputs a regulated 5V from the onboard regulator. Power can come from the USB, DC jack, or Vin pin.
Do not supply power to this pin directly
, as it bypasses the regulator.
3.3V
Outputs 3.3 volts generated by the onboard regulator. Maximum current draw is 50 mA.
GND
Ground pins used to complete the circuit. Multiple GND pins are available.
IOREF
Provides the voltage reference at which the microcontroller operates. Shields can use this pin to adapt to the board’s voltage (5V or 3.3V).
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Original Arduino Boards
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Why Choose Arduino Uno R3?
Beginner-friendly:
Easy to use with a simple IDE and beginner-level coding language.
Strong community support:
Large global community, tutorials, and troubleshooting help available.
Wide ecosystem:
Compatible with various shields, sensors, and components.
Affordable:
Budget-friendly option for students, hobbyists, and beginners.
Highly versatile:
Ideal for projects from basic LED control to complex IoT systems.
Reliable starting point:
Best entry-level board before exploring advanced Arduino models.
Open-source platform:
Hardware and software are fully open-source, allowing customization and innovation.
Stable performance:
Offers consistent and reliable operation for long-term learning and prototyping.
Arduino Nano vs Uno Comparison Table
Feature
Arduino UNO R3 (Original)
Arduino Nano (Original)
Price (Iotcart)
?1,860
?1,798
VIEW
Microcontroller
ATmega328P
ATmega328P
Operating Voltage
5V
5V
Input Voltage
7-12V
7-12V
Digital I/O Pins
14 (6 PWM)
14 (6 PWM)
Analog Input Pins
6
8
Clock Speed
16 MHz
16 MHz
Flash Memory
32 KB (0.5 KB used by bootloader)
32 KB (0.5 KB used by bootloader)
SRAM
2 KB
2 KB
EEPROM
1 KB
1 KB
USB Interface
Standard USB Type-B
Mini USB
Size
Larger (approx. 68.6mm x 53.4mm)
Compact (approx. 45mm x 18mm)
Best for
Beginners, shields, projects needing standard size
Compact projects, breadboard-friendly applications
Wireless Capability
Needs external module (e.g., ESP8266, HC-05)
Needs external module (e.g., ESP8266, HC-05)
Expandable with Shields
Yes, compatible with multiple shields
Limited due to size constraints
Project Ideas with Arduino Uno R3
LED Blinking Project
Temperature & Humidity Monitor
Smart Home Automation
Obstacle-Avoiding Robot
Automatic Plant Watering System
Digital Thermometer
Motion Detector Alarm
IoT Weather Station
RFID Door Lock System
Line Follower Robot
Smart Parking System
Bluetooth-Controlled Car
Light Follower Robot
Heart Rate Monitor
Home Security System
Know How to Install Arduino IDE on Windows, Mac & Linux - Click
HERE
!
Technical Specifications
| Arduino Model | Uno R3 |
|---|---|
| Microcontroller | ATmega328 |
| Operating Voltage | 5V |
| Supply Voltage (recommended) | 7-12V |
| Maximum supply voltage | 20V |
| Digital I/O Pins | 14 (of which 6 provide PWM output) |
| Analog Input Pins | 6 |
| DC Current per I/O Pin | 40mA |
| DC Current for 3.3V Pin | 50mA |
| Flash Memory | 32 KB of which 0.5 KB is used by the bootloader |
| SRAM | 2KB |
| EEPROM | 1KB |
| Clock Speed | 16MHz |
Use Cases
- This Arduino UNO R3 is a original board made in Italy by Arduino Officials
- This Arduino microcontroller board is the first in a series of USB Arduino boards
- Arduino platforms helps students empower in their journey of learning
- With this board you can start controlling the world around you
