LED class and methods in Raspberry Pi - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to turn the LED on.

Raspberry Pi

led = LED(17)
led.[1]()

Drag options to blanks, or click blank then click option'

Ablink

Boff

Con

Dtoggle

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'off' instead of 'on' will turn the LED off.

Using 'blink' or 'toggle' will not simply turn the LED on.

The on() method turns the LED on.

2fill in blank

medium

Complete the code to make the LED blink once.

Raspberry Pi

led = LED(18)
led.[1](1)

Drag options to blanks, or click blank then click option'

Ablink

Btoggle

Coff

Don

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'on' will keep the LED on without blinking.

Using 'off' will turn the LED off.

Using 'toggle' switches the LED state but does not blink.

The blink() method makes the LED blink. The argument 1 means blink once.

3fill in blank

hard

Fix the error in the code to toggle the LED state.

Raspberry Pi

led = LED(22)
led.[1]()

Drag options to blanks, or click blank then click option'

Atoggle

Bblink

Con

Doff

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'blink' will make the LED flash instead of toggling.

Using 'on' or 'off' sets the LED to a fixed state.

The toggle() method changes the LED from on to off or off to on.

4fill in blank

hard

Fill both blanks to create a dictionary with LED pins and the results of LED methods on those pins.

Raspberry Pi

led_states = {17: LED(17).[1](), 18: LED(18).[2]()}

Drag options to blanks, or click blank then click option'

Ais_lit

Bon

Coff

Dtoggle

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'on' instead of 'is_lit' will turn the LED on instead of checking.

Using 'toggle' will change the LED state instead of turning it off.

The is_lit() method checks if the LED is on, and off() turns the LED off.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension with LED pin names and states.

Raspberry Pi

led_status = {{ [1]: LED([3]).[2]() for [3] in [17, 18, 22] }}

Drag options to blanks, or click blank then click option'

Apin

Bis_lit

Dstate

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names for key and loop variable causes errors.

Using 'on' or 'off' instead of 'is_lit' changes LED state instead of checking.

The dictionary uses the pin number as key (pin), calls is_lit() to get the LED state, and loops over pins using pin.