Rising, falling, and change triggers in Arduino - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to attach an interrupt that triggers on a rising edge.

Arduino

attachInterrupt(digitalPinToInterrupt(2), handleInterrupt, [1]);

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ARISING

BCHANGE

CFALLING

DLOW

Attempts:

3 left

💡 Hint

Common Mistakes

Using FALLING instead of RISING will trigger on the opposite edge.

Using CHANGE triggers on both edges, not just rising.

The RISING mode triggers the interrupt when the signal goes from LOW to HIGH.

2fill in blank

medium

Complete the code to attach an interrupt that triggers on a falling edge.

Arduino

attachInterrupt(digitalPinToInterrupt(3), interruptHandler, [1]);

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AFALLING

BRISING

CHIGH

DCHANGE

Attempts:

3 left

💡 Hint

Common Mistakes

Using RISING instead of FALLING triggers on the opposite edge.

Using HIGH is not a valid interrupt mode.

The FALLING mode triggers the interrupt when the signal goes from HIGH to LOW.

3fill in blank

hard

Fix the error in the interrupt mode to trigger on any change.

Arduino

attachInterrupt(digitalPinToInterrupt(4), onChange, [1]);

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AFALLING

BCHANGE

CRISING

DLOW

Attempts:

3 left

💡 Hint

Common Mistakes

Using RISING or FALLING triggers only one edge, not both.

Using LOW triggers level-sensitive (while low), not on edges.

The CHANGE mode triggers the interrupt on both rising and falling edges.

4fill in blank

hard

Fill both blanks to create arrays that map pins to interrupt modes for rising and falling triggers.

Arduino

const int pins[] = {2, 3};
const int modes[] = { [1], [2] };

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ARISING

BFALLING

CCHANGE

DLOW

Attempts:

3 left

💡 Hint

Common Mistakes

Using CHANGE for both pins triggers on any change, not specific edges.

Using LOW is invalid for edge-triggered interrupts in this context.

Pin 2 uses RISING and pin 3 uses FALLING interrupt modes.

5fill in blank

hard

Fill all three blanks to create a map of pins to interrupt modes and attach interrupts accordingly.

Arduino

const int pins[] = {5, 6, 7};
const int modes[] = { [1], [2], [3] };

for (int i = 0; i < 3; i++) {
  attachInterrupt(digitalPinToInterrupt(pins[i]), interruptHandlers[i], modes[i]);
}

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ACHANGE

BRISING

CFALLING

DLOW

Attempts:

3 left

💡 Hint

Common Mistakes

Using CHANGE mode for all pins triggers on any change, not specific modes.

Forgetting that all listed modes (LOW, CHANGE, RISING, FALLING) are valid.

Pin 5 uses LOW (though usually not recommended), pin 6 uses RISING, and pin 7 uses FALLING modes.