Raspberry Pi For Beginners - 2022 Complete Course - Activity 05 - Solution

The video tutorial explains how to set up and use GPIO on a Raspberry Pi to control an LED with a button. It covers the basic configuration, writing a loop to monitor button states, and controlling the LED based on these states. The tutorial also addresses CPU usage issues caused by infinite loops and demonstrates how to optimize performance by adding a time.sleep function to reduce CPU load.

What is the primary purpose of importing the 'time' library in the GPIO setup?

• To measure the duration of button presses

• To calculate the frequency of LED blinking

• To introduce delays in the program

• To synchronize the LED with system time

What is the role of the infinite loop in the button monitoring process?

• To continuously check the button state

• To initialize the GPIO pins

• To set the LED to a default state

• To terminate the program when the button is pressed

Why is it important to add a time delay in the infinite loop?

• To prevent the LED from overheating

• To reduce the CPU usage

• To ensure the button is not pressed too quickly

• To synchronize with other running programs

What is the effect of running the infinite loop without a delay on CPU usage?

• It causes the program to crash

• It uses minimal CPU resources

• It maximizes CPU usage

• It has no effect on CPU usage

How does adding a time delay affect the frequency of code execution in the loop?

• It randomizes the frequency

• It increases the frequency

• It decreases the frequency

• It has no effect on frequency

What is the observed CPU usage after adding a time delay in the loop?

• Approximately 5%

• Approximately 25%

• Approximately 75%

• Approximately 50%

What is the recommended frequency for executing the loop with a time delay for this application?

• 50 times per second

• 10 times per second

• 100 times per second

• 200 times per second