Arduino UNO R3 vs R4 Current Limit

The video tutorial explains the differences between Arduino Uno R3 and R4, focusing on the current ratings of their IO pins. It highlights the need for different resistor values to prevent damage to the R4's pins. The tutorial provides a formula to calculate the required resistor value based on voltage and current. An experiment is conducted to test the effects of using a smaller resistor on the R4, showing that while immediate damage may not occur, caution is advised. The video emphasizes the importance of using the correct resistor to ensure the safety and functionality of the Arduino board.

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