How to Fade an LED with Arduino analogWrite

What is the primary advantage of using the analog write function over the digital write function for controlling an LED?

• It allows the LED to blink faster.

• It increases the LED's brightness.

• It enables gradual fading of the LED.

• It reduces power consumption.

Which type of Arduino pins are necessary for using the analog write function?

• Pins with a circle symbol.

• Pins marked with a minus sign.

• Pins labeled with a plus sign.

• Pins with a squiggly line or ~ symbol.

What tool can be used to simulate the Arduino circuit if you don't have a physical Arduino?

• Proteus

• Fritzing

• Tinkercad

• CircuitLab

In the breadboard setup, what is the purpose of the resistor connected in series with the LED?

• To protect the LED from excessive current.

• To increase the LED's brightness.

• To decrease the LED's brightness.

• To make the LED blink faster.

What is the role of the for loop in the Arduino example program for LED fading?

• To set the LED to a fixed brightness.

• To incrementally change the LED's brightness.

• To control the number of times the LED blinks.

• To run the program indefinitely.

Why is the maximum value for the analog write command set to 255?

• Because it is the maximum voltage the Arduino can output.

• Because it is the maximum brightness of the LED.

• Because it is the maximum value for an 8-bit binary number.

• Because it is the maximum current the LED can handle.

What happens if you provide a value greater than 255 to the analog write command?

• The LED will become brighter.

• The LED will turn off.

• The LED will blink rapidly.

• The LED will remain at maximum brightness.

What is the main purpose of pulse width modulation (PWM) in controlling an LED?

• To adjust the LED's brightness by varying the on/off time.

• To make the LED blink in patterns.

• To increase the LED's lifespan.

• To change the color of the LED.

How does PWM create an average voltage between 0 and 5 volts?

• By continuously varying the voltage.

• By rapidly switching the pin between high and low states.

• By using a resistor to divide the voltage.

• By using a capacitor to store charge.

What is the effect of setting an analog write value of 25 on an LED?

• The LED will blink rapidly.

• The LED will be dimmer than at full brightness.

• The LED will be at full brightness.

• The LED will not turn on.