Raspberry Pi For Beginners - 2022 Complete Course - Activity 06 - Solution

The video tutorial explains how to configure and use GPIO pins to control LEDs with a button. It covers the setup of GPIO, initialization of variables, and the implementation of a state machine to toggle LEDs. The tutorial also demonstrates how to handle button state changes and test the code for errors.

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

• To clean up the GPIO settings

• To manage time-based operations like delays

• To initialize the GPIO mode

• To set the GPIO pin numbers

Which GPIO mode is used in the setup?

• GPIO.BCM

• GPIO.IN

• GPIO.BOARD

• GPIO.OUT

Why is it important to initialize the state of all LEDs at the start?

• To prevent any LED from being powered accidentally

• To ensure they are all turned on

• To set them to a high state

• To configure them as input devices

What is the role of the previous button state variable?

• To initialize the GPIO pins

• To track the last known state of the button

• To store the current state of the LEDs

• To set the GPIO mode

How often does the main loop check the button state?

• Every 1 second

• Every 0.01 seconds

• Every 0.1 seconds

• Every 0.001 seconds

What does the state machine do in the context of this program?

• It toggles between different LEDs based on button presses

• It initializes the GPIO pins

• It sets the GPIO mode

• It cleans up the GPIO settings

What happens when the button state changes from low to high?

• All LEDs are turned on

• The program exits

• The next LED in sequence is powered on

• The current LED is turned off

What is the initial value of the LED index in the state machine?

• 3

• 0

• 2

• 1

What is the purpose of setting other LEDs to low when one is turned on?

• To ensure only one LED is on at a time

• To save power

• To initialize the button state

• To reset the GPIO mode

What is the expected behavior when the button is pressed continuously without release?

• The program restarts

• The current LED remains on

• All LEDs toggle rapidly

• The LEDs turn off