EEPROM read and write in Arduino - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to write the value 42 to EEPROM address 0.

Arduino

#include <EEPROM.h>

void setup() {
  EEPROM.[1](0, 42);
}

void loop() {}

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

Awrite

Bread

Cupdate

Dbegin

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'read' instead of 'write' will not store data.

Using 'begin' is for initializing EEPROM, not writing.

The write function stores a byte value at a specific EEPROM address.

2fill in blank

medium

Complete the code to read a byte from EEPROM address 0 and store it in variable 'val'.

Arduino

#include <EEPROM.h>

void setup() {
  byte val = EEPROM.[1](0);
}

void loop() {}

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

Aupdate

Bwrite

Ccommit

Dread

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'write' instead of 'read' will overwrite data.

Using 'commit' is for saving changes in some EEPROM types, not reading.

The read function retrieves a byte stored at a given EEPROM address.

3fill in blank

hard

Fix the error in the code to update EEPROM address 1 only if the value is different.

Arduino

#include <EEPROM.h>

void setup() {
  byte newVal = 100;
  EEPROM.[1](1, newVal);
}

void loop() {}

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

Awrite

Bupdate

Cread

Dcommit

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'write' always writes even if value is the same, reducing EEPROM life.

Using 'read' does not write data.

The update function writes a byte only if it differs from the current EEPROM value, saving write cycles.

4fill in blank

hard

Fill both blanks to write value 55 to EEPROM address 2 and then read it back into 'val'.

Arduino

#include <EEPROM.h>

void setup() {
  EEPROM.[1](2, 55);
  byte val = EEPROM.[2](2);
}

void loop() {}

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

Awrite

Bread

Cupdate

Dcommit

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'update' instead of 'write' is okay but not required here.

Using 'commit' is not needed for basic EEPROM operations.

First, write stores the value, then read retrieves it.

5fill in blank

hard

Fill all three blanks to update EEPROM address 3 with 77 only if different, then read it into 'val', and finally write 88 to address 4.

Arduino

#include <EEPROM.h>

void setup() {
  EEPROM.[1](3, 77);
  byte val = EEPROM.[2](3);
  EEPROM.[3](4, 88);
}

void loop() {}

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

Awrite

Bread

Cupdate

Dcommit

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'write' instead of 'update' for the first blank causes unnecessary writes.

Mixing up read and write functions.

Use update to write only if different, read to get the value, and write to store 88.