Official Arduino Uno R3 Development Board (ATmega328P)

Specifications

• Microcontroller: ATmega328P (DIP Package)

• Operating Voltage: 5V

• Digital I/O Pins: 14 (D0-D13)

• Analog Input Pins: 6 (A0-A5)

• Built-in LED: Pin 13 (PB5)

• Power Connectors: USB Type-B, DC Barrel Jack

• Origin: Designed and Assembled in Italy

Key Applications and Projects

• Educational Kits: The standard board for learning C++ programming and basic electronics in classrooms worldwide.

• Prototyping Platform: Rapidly testing sensors, servos, and displays on a breadboard before designing a custom PCB.

• Home Automation Elements: Reading DHT11 temperature sensors and controlling 5V relay modules to automate desk fans or lighting.

Unlock New Capabilities (Project Evolution) The Ultimate Desktop Weather Station: Start by learning how to blink the onboard LED. Once mastered, evolve your Uno R3 project! Connect a low-cost I2C OLED display to the SDA and SCL pins, and wire a BME280 environmental sensor to the same bus. Add a 9V power supply to the DC barrel jack to make it completely standalone. Within an afternoon, you've transformed a raw circuit board into a permanent, highly accurate desktop weather station displaying real-time temperature, humidity, and barometric pressure!

PACKAGE INCLUDED

• 1 x Official Arduino Uno R3 Board

• 1 x Clear Plastic Protective Base

• 1 x Official Arduino Packaging Box

FREQUENTLY ASKED QUESTIONS (FAQ)

1. What microcontroller does this board use? It uses the ATmega328P microcontroller.

2. Is the microcontroller chip removable? Yes, this classic R3 version uses a DIP (Dual In-line Package) chip seated in a socket, allowing it to be easily removed and replaced if damaged.

3. What is the operating logic voltage? The board operates on 5V logic.

4. How do I connect it to my computer? You need a standard USB Type-B cable to plug into the silver USB port on the board.

5. How can I power the board without a computer? You can plug a 7V to 12V DC power adapter into the black DC barrel jack, or supply voltage directly to the Vin and GND pins.

6. How many digital pins does it have? There are 14 digital input/output pins, labeled D0 through D13.

7. Which pins support PWM (dimming/analog output)? Specific digital pins support PWM output, commonly denoted by a tilde (~) symbol next to the numbers.

8. How many analog input pins are there? There are 6 analog input pins, labeled A0 through A5.

9. Where are the I2C pins located? The I2C protocol uses the SDA and SCL pins. On the Uno R3, these are located near the AREF pin at the top left.

10. Where are the SPI pins located? SPI communication utilizes the SCK, MISO, MOSI, and SS pins, which share functionality with digital pins D13, D12, D11, and D10 respectively.

11. Is there a built-in LED I can program? Yes, there is a built-in LED tied to digital pin 13 (PB5).

12. What are the TX and RX pins for? Pins 0 (RX) and 1 (TX) are used for hardware UART serial communication.

13. What is the clear plastic piece that comes with it? It is a protective plastic base or sled that prevents the sharp solder joints on the bottom of the board from scratching your desk.

14. Is this an authentic Arduino board? Yes, this is an official board, specifically designed and assembled in Italy, and arrives in the official Arduino packaging.

15. Does it have built-in Wi-Fi or Bluetooth? No, the standard Arduino Uno R3 does not have native wireless connectivity.

16. What is the silver oval component on the board? That is the crystal oscillator, which regulates the clock speed of the board.

17. What are the ICSP pins used for? The 2x3 header pins (ICSP) allow you to program the microcontroller directly using an external programmer.

18. What is the Vin pin used for? The Vin pin can be used to supply input voltage directly to the board's internal voltage regulator if you are not using USB or the barrel jack.

19. What does the button in the corner do? The tactile button located near the USB port is the Reset button, which restarts the code running on the microcontroller.

20. What is the IOREF pin for? The IOREF pin provides the voltage reference with which the microcontroller operates, allowing compatible shields to adapt to the board's logic level.