EEPROM for storing settings in Arduino - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is EEPROM in Arduino?

EEPROM is a small memory inside the Arduino that keeps data even when the power is off. It is used to save settings or information that should stay after the board is turned off.

beginner

How do you write a byte to EEPROM in Arduino?

Use the function EEPROM.write(address, value); where address is the memory location and value is the byte to store.

beginner

How do you read a byte from EEPROM in Arduino?

Use the function EEPROM.read(address); to get the byte stored at the given address.

intermediate

Why should you limit EEPROM writes?

EEPROM has a limited number of write cycles (usually 100,000). Writing too often can wear it out and cause data loss.

intermediate

How can you store multiple settings in EEPROM?

You can store each setting at a different address or use a structure and save it as bytes. Remember to read and write each setting carefully to avoid overwriting.

What happens to EEPROM data when Arduino is powered off?

A Data is erased automatically

B Data is copied to RAM

C Data becomes random

D Data is saved and remains intact

EEPROM keeps data even when power is off, unlike RAM which loses data.

Which function writes a byte to EEPROM in Arduino?

A EEPROM.read()

B EEPROM.write()

C EEPROM.store()

D EEPROM.save()

EEPROM.write(address, value) stores a byte at the specified address.

What is a common limit of EEPROM write cycles?

A 100,000 times

B 100 times

C 10,000 times

D 10 times

EEPROM typically supports about 100,000 write cycles before wearing out.

How do you read a byte from EEPROM?

A EEPROM.write(address)

B EEPROM.get(address)

C EEPROM.read(address)

D EEPROM.load(address)

EEPROM.read(address) returns the byte stored at the given address.

What is a good practice when storing multiple settings in EEPROM?

A Use different addresses or a structure for each setting

B Avoid reading settings

C Write settings every second

D Store all settings at the same address

Using different addresses or a structure prevents overwriting and keeps data organized.

Explain how EEPROM can be used to save and retrieve a user setting on Arduino.

Think about how to save a value and get it back even after turning off the Arduino.

Describe why it is important to limit the number of writes to EEPROM and how you might do that in a program.

Consider the lifespan of EEPROM and how to avoid unnecessary writes.