Week 10 Quiz: Output Devices and Actuators

Question 1: PWM vs Digital Output

What is the main advantage of using PWM output instead of digital output for LED control?

A) PWM uses less power than digital output B) PWM allows brightness control and smooth transitions C) PWM makes LEDs last longer D) PWM is faster than digital output

Question 2: LED Current Limiting

Why do LEDs require current limiting resistors?

A) To make them brighter B) To prevent excessive current that could damage the LED C) To change their color D) To make them blink automatically

Question 3: PWM Range

What range of values can be used with analogWrite() for PWM output?

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

Question 4: Buzzer Types

What is the main difference between active and passive buzzers?

A) Active buzzers are louder than passive buzzers B) Active buzzers have fixed frequency, passive buzzers allow frequency control C) Active buzzers use more power than passive buzzers D) There is no difference between them

Question 5: Servo Control

What type of signal is used to control servo motor position?

A) Analog voltage (0-5V) B) Digital HIGH/LOW signals C) PWM signals with specific pulse widths D) Serial communication commands

Question 6: Servo Position Range

What is the typical position range for a standard servo motor?

A) 0° to 90° B) 0° to 180° C) 0° to 360° D) -90° to +90°

Question 7: Tone Function

What Arduino function is used to generate musical tones with a passive buzzer?

A) analogWrite() B) digitalWrite() C) tone() D) playSound()

Question 8: Servo Library

Which Arduino library function is used to set a servo to a specific position?

A) servo.move() B) servo.write() C) servo.position() D) servo.set()

Question 9: RGB LED Project

You want to create an RGB LED mood light that changes colors based on room temperature. Describe how you would connect and program this system, including what input device you'd use and how you'd map temperature to colors.

Question 10: Troubleshooting

A student reports that their servo motor is "jittery" and doesn't hold its position steadily. It also seems to move to random positions occasionally. What are three possible causes of this problem and how would you fix each one?