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Arduino Uno R3 Original
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The Arduino Uno R3 is a microcontroller board based on the ATmega328P chip and is widely recognized as the best original Arduino Uno board for beginners and projects.
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. As part of the Arduino Uno Rev3 original specifications and features, it delivers a reliable and easy-to-use development platform.
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. The Arduino Uno ATmega328P original board for robotics IoT and automation is especially popular among students and engineers building smart systems.
It can also interface with other Arduino boards or Raspberry Pi, making it a flexible choice for creators and students. When comparing Arduino Uno original price in India, this board offers excellent value considering its durability, ecosystem, and support.
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| 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). |
Explore a wide range of Original Arduino Boards on Robocraze.
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 |
Know How to Install Arduino IDE on Windows, Mac & Linux - Click HERE!
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 |
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. This ease of use is one of the reasons it is considered the best original Arduino Uno board for beginners and projects.
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, ensuring reliable communication as defined in Arduino Uno Rev3 original specifications and features.
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.
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.
Flash Memory: 32 KB (0.5 KB used by bootloader)
SRAM: 2 KB
EEPROM: 1 KB
UART (Serial): Pins 0 (RX) & 1 (TX)
SPI: Pins 10–13
I2C (TWI): Pins A4 (SDA) & A5 (SCL)
Supports both hardware and SoftwareSerial.
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.
Yes, the Arduino Uno R3 is one of the most popular and beginner-friendly microcontroller boards. It is reliable, affordable, and widely supported. When evaluating the Arduino Uno original price in India, it offers excellent value for both beginners and professionals.
The Arduino Uno functions as a programmable microcontroller board that can read sensors, control actuators, and communicate with other devices.
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
The package typically includes the official Arduino Uno R3 microcontroller board and a USB cable for programming and power. Depending on the kit, it may also include accessories like jumper wires, sensors, or a breadboard.
If you plan to buy Arduino Uno original board online India official, always verify package contents on the product page.
The Arduino Uno R3 is powered by the ATmega328P microcontroller, known for its stability and versatility. It features 14 digital I/O pins, 6 analog inputs, a 16 MHz clock speed, and USB connectivity, making it ideal for a wide range of electronics and embedded projects.
Yes, the Arduino Uno R3 is one of the best Arduino boards for beginners. It’s easy to set up, compatible with numerous sensors and modules, and supported by an extensive online community. This makes it perfect for anyone learning electronics, coding, and prototyping.
The Arduino Uno R3 board is widely used in robotics projects such as line-following robots, obstacle-avoiding robots, and IoT-based automation systems. It works seamlessly with motor driver shields, sensors, and communication modules, allowing users to build creative and functional robots.
Yes, the official Arduino Uno R3 comes with a 6-month manufacturer warranty covering defects in materials and workmanship. When checking the Arduino Uno original price in India, ensure you are purchasing from an authorized seller to receive warranty benefits.
This product comes with a 1-year manufacturer warranty from the date of purchase, covering manufacturing defects only.
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.