Week 6 Quiz: PWM & Analog Outputs

Test your understanding of Pulse Width Modulation and analog output control

📝 10 questions covering PWM, analogWrite(), and output control

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Question 1: PWM Range

What is the range of values that can be used with analogWrite() on Arduino?

A) 0 to 100 B) 0 to 255 C) 0 to 1023 D) 0 to 5

Question 2: PWM Pins

Which pins on Arduino Uno support PWM output?

A) All digital pins (0-13) B) Pins 3, 5, 6, 9, 10, 11 (marked with ~) C) Only analog pins A0-A5 D) Pins 0, 1, 2, 4, 7, 8

Question 3: Duty Cycle

What does a 75% duty cycle mean in PWM?

A) Signal is HIGH 25% of the time B) Signal is HIGH 75% of the time C) Signal frequency is 75 Hz D) Signal voltage is 3.75V

Question 4: Average Voltage

If analogWrite(pin, 128) is used on a 5V system, what is the average voltage output?

A) 1.25V B) 2.5V C) 3.75V D) 5V

Question 5: RGB Color

What RGB values (Red, Green, Blue) would create a yellow color?

A) (255, 0, 0) B) (0, 255, 0) C) (255, 255, 0) D) (0, 255, 255)

Question 6: Motor Control Safety

Why should you never connect a motor directly to an Arduino pin?

A) Motors don't work with digital signals B) Motors require more current than Arduino pins can provide C) Motors only work with analog pins D) Motors need 12V to operate

Question 7: PWM Frequency

What is the typical PWM frequency on Arduino Uno?

A) 50 Hz B) 490 Hz or 980 Hz C) 1000 Hz D) 16 MHz

Question 8: LED Fading

In a fading LED program, what happens when the brightness variable reaches 255?

A) The program stops B) The fade direction reverses C) The LED turns off D) The brightness resets to 0

Question 9: PWM Applications

Describe three practical applications of PWM in electronics projects and explain why PWM is useful for each application.

Question 10: RGB Color Mixing

Explain how RGB color mixing works with PWM. How would you create a purple color, and what PWM values would you use for each color channel?

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