UNO R3 Compatible Development Board - ATmega328P DIP Version with 16U2 USB

Specifications

• Microcontroller: ATmega328P-PU (Socketed DIP-28)

• USB-to-Serial Chip: ATmega16U2

• Operating Voltage: 5V

• Input Voltage (Recommended via Barrel Jack): 7V to 12V DC

• Input Voltage (Absolute Limits): 6V to 20V DC

• Digital I/O Pins: 14 (of which 6 provide PWM output)

• Analog Input Pins: 6

• DC Current per I/O Pin: 20 mA (Recommended), 40 mA (Absolute Max)

• Flash Memory: 32 KB (ATmega328P) of which 0.5 KB used by bootloader

• SRAM: 2 KB

• EEPROM: 1 KB

• Clock Speed: 16 MHz Quartz Crystal

Key Applications and Projects

• The First Blinking LED: The universal "Hello World" of electronics. Learning how to write code that turns the onboard LED (connected to Pin 13) on and off.

• Smart Plant Watering System: Using the analog pins to read a soil moisture sensor, and a digital pin to trigger a water pump when your plant gets thirsty.

• Obstacle Avoiding Robot: Combining ultrasonic distance sensors and motor driver shields to build a car that navigates your living room autonomously.

Unlock New Capabilities (Project Evolution)

• The Custom PCB Migration: The best part about the socketed DIP chip? You can build your final project without leaving the whole UNO board behind! Once you have prototyped your circuit on a breadboard and finalized your code, you can literally pull the programmed ATmega328P chip out of the UNO's socket. Place that chip onto a custom soldered perfboard with a 16MHz crystal and a 5V power supply, and your project will run completely standalone! You can then buy a blank replacement chip for your UNO and start your next project.

Package Includes:

• 1 x UNO R3 Compatible Development Board (DIP ATmega328P Version) (Note: USB Type-B programming cable is not included. You will need a standard "Printer Style" USB cable to connect this to your computer.)

FREQUENTLY ASKED QUESTIONS (FAQ)

1. Is this an official Arduino brand board? No, this is a high-quality "Compatible" board. Because Arduino hardware is open-source, manufacturers are legally allowed to use the schematics to build identical, fully compatible boards at a lower cost.

2. What does "DIP" mean? DIP stands for "Dual Inline Package." It refers to the large, rectangular ATmega328P chip with visible metal legs. It is seated in a socket, meaning it can be physically removed and replaced.

3. Why is DIP better than SMD for beginners? SMD (Surface Mount Device) chips are permanently soldered to the board. If you accidentally fry an SMD chip by wiring something backward, the entire board is ruined. If you fry this DIP chip, you can just buy a $2 replacement chip and push it into the socket.

4. Do I need to install CH340 drivers for this board? No! This board uses the ATmega16U2 chip for USB communication, just like the official boards. It should be recognized instantly by Windows, Mac, and Linux without manual driver installation.

5. What software do I use to program this? You program it using the free, official Arduino IDE (Integrated Development Environment) available from Arduino.cc.

6. What kind of USB cable does it need? It requires a USB Type-B cable. This is the slightly square, chunky USB connector commonly known as a "printer cable."

7. How do I power it without a computer? You can plug a battery pack (like a 9V battery) or an AC wall adapter into the round black DC Barrel Jack.

8. What voltage should I plug into the barrel jack? The recommended input is 7V to 12V DC. The onboard voltage regulator will step it down to the 5V the board needs.

9. What happens if I plug 12V into the 5V pin? You will instantly destroy the microcontroller. The 5V pin bypasses the regulator. Only ever put 7V-12V into the DC barrel jack or the "VIN" pin.

10. How many things can I control with this? The board has 14 digital Input/Output pins (for LEDs, relays, buttons) and 6 Analog Input pins (for sensors like light and temperature).

11. What is PWM? PWM stands for Pulse Width Modulation. Pins marked with a "~" symbol can simulate an analog output, allowing you to fade LEDs or control motor speeds rather than just turning them strictly ON or OFF.

12. Can I drive a motor directly from the pins? NO. The pins can only output 20mA of current—barely enough for a single LED. Trying to power a motor directly from a digital pin will fry the chip. You must use a motor driver module or a relay.

13. What is an Arduino "Shield"? A shield is an expansion board (like a Motor Shield or WiFi Shield) that has matching pins on the bottom, allowing you to stack it directly on top of the UNO like Lego bricks.

14. What is the red button next to the USB port? That is the Reset button. Pressing it restarts the code you have uploaded from the very beginning. It does not erase your code.

15. Does the board lose my code when I unplug it? No. The ATmega328P has flash memory. Your code is permanently saved on the chip even when power is completely removed, until you upload new code over it.

16. What are the 6 pins sticking up near the reset button? That is the ICSP (In-Circuit Serial Programming) header for the USB interface chip. Beginners will rarely need to use this.

17. What happens if I put my replacement ATmega328P chip in backward? It will overheat rapidly and likely be destroyed. The chip has a small half-moon notch on one end; ensure that notch matches the silkscreen drawing on the board before pressing it in.

18. Can I use a 5V power bank to run it? Yes! A standard USB power bank plugged into the USB port is an excellent, portable way to run your UNO projects.

19. If I buy a replacement ATmega328P chip, does it work instantly? The replacement chip MUST have the "Arduino Bootloader" pre-installed on it. If you buy a completely blank factory chip, you will have to burn the bootloader yourself before the Arduino IDE will talk to it.

20. Can I program this in Python? Natively, no. The Arduino IDE uses a variant of C/C++. However, you can use your computer running Python to send serial commands over the USB cable to the Arduino to control it.