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.

What is the current rating of the IO pins on the Arduino Uno R4?

• 10 milliamps

• 15 milliamps

• 8 milliamps

• 20 milliamps

Which equation is used to calculate the required resistor value for an LED circuit?

• Voltage of source divided by voltage drop across LED minus desired current

• Voltage of source plus voltage drop across LED multiplied by desired current

• Voltage of source minus voltage drop across LED divided by desired current

• Voltage of source multiplied by voltage drop across LED plus desired current

What resistor value was calculated for the Uno R4 using the given equation?

• 220 ohms

• 150 ohms

• 470 ohms

• 375 ohms

What happens if a smaller resistor is used on the Uno R4 instead of the recommended value?

• The LED will not light up

• The IO pin might get damaged

• The circuit will short circuit

• The LED will blink faster

Why is it important to use a larger resistor on the Uno R4?

• To increase the brightness of the LED

• To make the circuit more efficient

• To prevent damage to the IO pins

• To reduce the power consumption