Overview
Things
Story

Introduction
Arduino Code
Here is the output view
Conclusion

Published February 16, 2022 © MIT

Read and Write Float values into EEPROM on Arduino UNO

You will learn how to read and write floating value into EEPROM easily. Learn how to work with custom data types as well! Using Wokwi!

BeginnerProtip10,305

Read and Write Float values into EEPROM on Arduino UNO

Things used in this project

Hardware components

Arduino UNO

DIYables USB Cable 2.0 Type A/B for Arduino Uno

Story

Introduction

Every Arduino has a built in EEPROM. Depending on the actual MCU on your Arduino Board the size of the EEPROM will vary.

In this article you will learn how to

Read and write Float variables into EEPROM easily
Store and retrieve custom data types easily

Let us get started 🏃‍♀️

Arduino Code

Here is the example which demonstrates the EEPROM operation. Please scroll to the end of the article to see the complete code with formatting

Here is the output view

Serial monitor window on Wokwi Arduino Simulator

You can use this link to play with the simulator, tinker with the code and add useful sections to your projects in the future!

Feel free to share your feedback on this article in the comments

https://wokwi.com/arduino/projects/323281869291389524

Writing a FLOAT data type into Arduino UNO
float f = 123.456f; //Variable to store in EEPROM.
int eeAddress = 0; //Location we want the data to be put.
//One simple call, with the address first and the object second.
EEPROM.put(eeAddress, f);

The EEPROM.put is the key here. You have to send two parameters

The address in the EEPROM where you want to write the data
the data to be written

The EEPROM put() function accepts simply the address and the object. The function interface is too simple and very helpful.

-------------------------------------------------------------------------------------------

Links for EEPROM put() function - https://www.arduino.cc/en/Reference/EEPROMPut

Links for EEPROM get() function - https://www.arduino.cc/en/Reference/EEPROMGet

While reading the data, you have to make sure you send the object parameter correctly. Once you read it, you can print the object elements easily.

EEPROM.get( eeAddress, customVar );EEPROM.get( eeAddress, customVar );
Serial.println( "Read custom object from EEPROM: " );
Serial.println( customVar.field1 );
Serial.println( customVar.field2 );
Serial.println( customVar.name );

I hope you will be able to use these functions in your next project and easily store and retrieve custom datatypes easily.

Conclusion

In this article you saw how to read and write objects (float types, integers, text and more) easily! Please feel free to post your questions and feedback.

Thank you and see you next time!

EEPROM read and write in a easier way

#include <EEPROM.h>
struct MyObject {
float field1;
byte field2;
char name[10];
};
void setup() {
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
float f = 123.456f; //Variable to store in EEPROM.
int eeAddress = 0; //Location we want the data to be put.
//One simple call, with the address first and the object second.
EEPROM.put(eeAddress, f);
Serial.println("Written float data type!");
/** Put is designed for use with custom structures also. **/
//Data to store.
MyObject customVar = {
3.14f,
65,
"Working!"
};
eeAddress += sizeof(float); //Move address to the next byte after float 'f'.
EEPROM.put(eeAddress, customVar);
Serial.print("\nWritten custom data type! Now we will read it in a second!");
delay(1000);
Serial.print("\n**************************************************");
Serial.print("\n Read float from EEPROM: " );
//Get the float data from the EEPROM at position 'eeAddress'
EEPROM.get( eeAddress, f );
Serial.println( f, 3 ); //This may print 'ovf, nan' if the data inside the EEPROM is not a valid float.
// get() can be used with custom structures too.
eeAddress = sizeof(float); //Move address to the next byte after float 'f'.
//MyObject customVar; //Variable to store custom object read from EEPROM.
EEPROM.get( eeAddress, customVar );
Serial.println( "Read custom object from EEPROM: " );
Serial.println( customVar.field1 );
Serial.println( customVar.field2 );
Serial.println( customVar.name );
}
void loop() { /* Empty loop */ }

Credits

Hack star

75 projects • 136 followers

an Arduino enthusiast and an electronic hobbyist

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Read and Write Float values into EEPROM on Arduino UNO

Read and Write Float values into EEPROM on Arduino UNO

Things used in this project

Hardware components

Story

Introduction

Arduino Code

Here is the output view

Conclusion

Code

EEPROM read and write in a easier way

Credits

Hack star

Comments

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