Why interrupts improve responsiveness in Arduino - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to attach an interrupt to pin 2 that calls the function handleInterrupt.

Arduino

attachInterrupt(digitalPinToInterrupt([1]), handleInterrupt, RISING);

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A2

B3

C4

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing a pin that does not support interrupts.

Pin 2 is the correct pin to attach the interrupt on many Arduino boards.

2fill in blank

medium

Complete the code to declare the interrupt service routine function named handleInterrupt.

Arduino

void [1]() {
  // code to run when interrupt occurs
}

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AinterruptHandler

BhandleInterrupt

ConInterrupt

DinterruptRoutine

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different function name than in attachInterrupt.

The function name must match the one used in attachInterrupt.

3fill in blank

hard

Fix the error in the code to correctly enable interrupts.

Arduino

noInterrupts();
// critical code here
[1]();

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AdisableInterrupts

BstartInterrupts

CenableInterrupts

Dinterrupts

Attempts:

3 left

💡 Hint

Common Mistakes

Using a non-existent function name to enable interrupts.

The function interrupts() re-enables interrupts after noInterrupts().

4fill in blank

hard

Fill both blanks to create a dictionary that maps pin numbers to their interrupt numbers.

Arduino

const int interruptMap[] = { [1]: 0, [2]: 1 };

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A2

B3

C4

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using pins that do not correspond to interrupt numbers.

Pin 2 maps to interrupt 0 and pin 3 maps to interrupt 1 on many Arduino boards.

5fill in blank

hard

Fill all three blanks to complete the code that sets up an interrupt and handles it.

Arduino

volatile bool flag = false;

void [1]() {
  flag = true;
}

void setup() {
  attachInterrupt(digitalPinToInterrupt([2]), [3], FALLING);
}

void loop() {
  if (flag) {
    flag = false;
    // handle event
  }
}

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

AhandleInterrupt

B2

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Mismatching function names or wrong pin number.

The interrupt service routine is named handleInterrupt, attached to pin 2, and the function name is handleInterrupt.