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- 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
- This board comes with 6 months manufacturing warranty provided by the Arduino
Note: Robocraze is the Authorized Seller of Arduino in India. You can order and get Original Arduino products with proper Warranties, COD, Free Shipping, Easy Return & Refund, and Affordable Prices.
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.
Browse the best collection of original 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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Arduino Nano vs Uno Comparison Table
Feature |
Arduino UNO R3 (Original)
|
Arduino Nano (Original)
|
|---|---|---|
| Price (Robocraze) | ?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 |
Shipping & Returns
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Package Includes:
- 1 x Arduino UNO R3 Original
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 |
Warranty Coverage:
This product comes with a 1-year manufacturer warranty from the date of purchase, covering manufacturing defects only.
Warranty Void If:
The product shows signs of physical damage, mishandling, exposure to water/moisture, fire, natural calamities, unauthorized repairs, improper storage near heat or direct sunlight, or alteration in any way.
1. How do I program the Arduino Uno R3?
You can program the Arduino Uno using the Arduino IDE. Select “Arduino Uno” under Tools > Board. The Uno comes with a preloaded bootloader, so you can upload sketches via USB without needing an external programmer.
2. Can I bypass the bootloader to upload code?
Yes, you can program the Uno directly through the ICSP (In-Circuit Serial Programming) header using tools like Arduino ISP, bypassing the bootloader.
3. What USB chip does the Uno R3 use?
Unlike earlier boards that used the FTDI chip, the Uno R3 uses an ATmega16U2 (or ATmega8U2 in Rev1/Rev2) as the USB-to-serial converter.
4. How do I power the Arduino Uno?
The Uno can be powered via USB, a DC adapter (7–12V recommended), or a battery. External power connects through the power jack or VIN/GND pins.
5. What are the power limitations I should know?
- Operating voltage range: 6–20V
- Recommended range: 7–12V
- Over 12V may overheat the voltage regulator.
- Supplying power directly to the 5V or 3.3V pins may damage the board.
6. What memory does the Arduino Uno have?
- Flash Memory: 32 KB (0.5 KB used by bootloader)
- SRAM: 2 KB
- EEPROM: 1 KB
7. What is the purpose of the resettable polyfuse?
It protects your computer’s USB port from overcurrent or short circuits. It breaks the connection if over 500 mA is drawn.
8. What communication protocols does the Uno support?
- UART (Serial): Pins 0 (RX) & 1 (TX)
- SPI: Pins 10–13
- I2C (TWI): Pins A4 (SDA) & A5 (SCL)
- Supports both hardware and SoftwareSerial.
9. How does the Uno perform auto-reset during uploads?
The Uno resets automatically before code upload via USB, thanks to a 100nF capacitor connecting the reset line to the USB-to-serial chip’s DTR pin. This enables seamless uploading from the IDE.
10. Can I disable auto-reset on the Uno?
Yes. You can either cut the “RESET-EN” trace or connect a 110-ohm resistor between 5V and the reset line.
11. What is the function of the IOREF pin?
The IOREF pin provides the voltage reference of the board (usually 5V), helping shields adapt to the correct voltage level.
12. Is the Arduino Uno R3 good?
Yes, the Arduino Uno R3 is one of the most popular and beginner-friendly microcontroller boards. It's reliable, affordable, and well-supported with tons of community tutorials, libraries, and project ideas.
13. What is the function of the Arduino Uno?
The Arduino Uno functions as a programmable microcontroller board that can read sensors, control actuators, and communicate with other devices.
14. Can Arduino Uno handle 12V?
Yes, the Arduino Uno can handle 12V through its DC jack or VIN pin. However, 7–12V is the recommended range. Supplying more than 12V can overheat the voltage regulator and damage the board.
15. What is an Arduino Uno used for?
- The Arduino Uno is used in a wide range of applications, including:
- DIY electronics projects
- Home automation
- Industrial automation
- Robotics and sensor integration
- Learning embedded systems and programming
