EEPROM for storing settings in Arduino - Mini Project: Build & Apply

EEPROM for storing settings

📖 Scenario: You are building a small device that remembers a user's preferred brightness setting even after it is turned off. To do this, you will store the brightness value in the Arduino's EEPROM memory.

🎯 Goal: Create a program that saves a brightness setting to EEPROM and reads it back when the device starts.

📋 What You'll Learn

Use the Arduino EEPROM library

Store a brightness value (0-255) in EEPROM address 0

Read the brightness value from EEPROM on startup

Print the stored brightness value to the Serial Monitor

💡 Why This Matters

🌍 Real World

Many devices need to remember user settings like brightness or volume even after being turned off. EEPROM allows saving these settings permanently.

💼 Career

Understanding EEPROM is important for embedded systems programming and working with microcontrollers in IoT and hardware projects.

1

Setup EEPROM and initial brightness value

Include the EEPROM.h library and create a variable called brightness with the value 128.

Arduino

# Include the EEPROM library and create brightness variable
// Your code here

Need a hint?

Use #include <EEPROM.h> to include the EEPROM library.

Create an int variable named brightness and set it to 128.

2

Write brightness to EEPROM

In the setup() function, write the brightness value to EEPROM address 0 using EEPROM.write().

Arduino

#include 

int brightness = 128;

void setup() {
  // Write brightness to EEPROM address 0
  // Your code here
}

void loop() {
}

Need a hint?

Use EEPROM.write(address, value) to save the brightness value at address 0.

3

Read brightness from EEPROM

In the setup() function, after writing, read the brightness value back from EEPROM address 0 using EEPROM.read() and store it in the brightness variable.

Arduino

#include 

int brightness = 128;

void setup() {
  EEPROM.write(0, brightness);
  // Read brightness from EEPROM address 0
  // Your code here
}

void loop() {
}

Need a hint?

Use brightness = EEPROM.read(0); to get the stored value back.

4

Print brightness value to Serial Monitor

Initialize the Serial communication at 9600 baud in setup() and print the brightness value using Serial.println().

Arduino

#include 

int brightness = 128;

void setup() {
  EEPROM.write(0, brightness);
  brightness = EEPROM.read(0);
  // Initialize Serial and print brightness
  // Your code here
}

void loop() {
}

Need a hint?

Use Serial.begin(9600); to start serial communication.

Use Serial.println(brightness); to print the brightness value.