Questions tagged [eeprom]
Electronically Erasable ROM is a type of memory available on most boards. It is used for storing persistent data. Use the tag for questions about the EEPROM library or the hardware.
165
questions
0
votes
1answer
359 views
Why does my 16x2 LCD displays weird letters and can't insert key from keypad?
I'm a newbie on Arduino here, and this is my first project on 16x2 LCD, 4x4 keypad and others. So, the story is, after I uploaded the program for my group's Arduino alarm clock to the Arduino board, ...
1
vote
2answers
579 views
How to manage variable I2C read lengths requiring address incrementation (Wire/I2C/EEPROM IC emulation)
The question is about how to have information/control of a variable length read for an Arduino acting as a slave device.
The concrete context is that I want to emulate an EEPROM IC.
A byte write to ...
1
vote
2answers
456 views
Save Data before Shutdown
I am building a positioner and I store the current position to EEPROM when the move is complete. On start up, I want the positioner to return to the HOME position. I am running an UNO powered from the ...
0
votes
1answer
838 views
Adafruit Trinket M0 persistent storage?
I am using an Adafruit Trinket M0 to program a small game and would like to save the game state every so often. I am programming it through the Arduino IDE as the chip does not have enough space to ...
3
votes
1answer
500 views
EEPROM size limitation issue
I am creating a test program with Arduino Nano where I can save network and password. Here is my code to start with:
void SaveNetwork(String ssid, String pass){
String com = ssid + "~" + pass;
...
1
vote
1answer
64 views
Writing and reading an ID to/from an Arduino reliably
I need a way to both ID (a sketch/compiled hex) and later on, identify based on this ID the project that got uploaded to my Arduino microcontroller. As of right now, I have explored multiple options ...
0
votes
1answer
2k views
Wemos D1 EEProm put/get not getting correct value
Hey all I have the following code in my Arduino IDE:
#include <EEPROM.h>
#include <ArduinoJson.h>
bool debuggin = true;
int brightness = 255;
int ambientLight = 30;
...
1
vote
1answer
428 views
Device Security - EEPROM data [duplicate]
I'm writing code for Arduino that I plan to distribute. But I worry about piracy (the .HEX can extracted from the board and reuploaded to another).
With that in mind, I am storing data to the EEPROM.
...
0
votes
3answers
1k views
Using EEPROM Anything in loop()
I'm trying to make a programm for Arduino Bluno Beetle, that saves a string in the loop. Here is my code:
#include <EEPROM.h>
#include <EEPROMAnything.h>
struct config_t{
String ...
0
votes
1answer
248 views
How do I inherit a class that requires &foo() in its constructor?
General
I have a library with a class constructor class Math(&foo1,&foo2);, which I would like to put into a library for class Algebra(), where foo1 and foo2 are defined in Algebra.cpp
My ...
-2
votes
1answer
216 views
How does Arduino memorize the last bytes from Bluetooth HC-05?
I have made a home automation project.
Description: Light on, off through HC-05 Bluetooth module and my Android app. The problem is when the power is gone, the system stops, that's OK. After that, ...
1
vote
2answers
737 views
How can I declare global array with its length stored in EEPROM?
I am working with Arduino UNO connected with BV4612 display.
I am working on a simple code that controls several water pumps. Each pump has several modes it can run in. I store these modes in an array....
3
votes
3answers
2k views
Is it possible to use extra AVR Flash memory as non-volatile EEPROM-like Flash memory storage?
In STM32 microcontrollers it is possible to use a technique that ST calls IAP, or In-Application Programming, in order to write to the Flash memory from your running application. They even have a nice ...
0
votes
1answer
2k views
string.indexOf() always returns a non-zero value
I am developing a hardware project which contains a facility to change the stored password by any user, if he/she knows the current password.The new password is stored in arduino eeprom. In the main ...
2
votes
3answers
464 views
Which EEPROM has a long lifecycle?
I would like to build a box counter for machine, so I'm going to use EEPROM in Arduino to save count. But the lifecycle is limited to 100,000 writes. Please suggest an external EEPROM with a long ...
0
votes
1answer
938 views
nodemcu EEPROM corrupting
Platform
Hardware: [nodemcu amica ESP8266MOD]
Core Version: [nodemcu-master-21-modules-2018-03-17-17-09-10]
Development Env: [Arduino IDE|]
Operating System: [Windows|...
0
votes
1answer
369 views
Write to EEPROM before shutdown
I'm currently designing a battery operated device that has to write data to an EEPROM before shutting down, or in regular intervals to save data. Would it damage the EEPROM if it had to shut down ...
1
vote
1answer
330 views
ArduinoJson buffer gets overwritten
I have not that much experience with native languages like c/c++ and I'm facing a strange issue, which drives me crazy. So I'm using an Wemos D1 mini (ESP8266) which uses a class calles ConfigManager ...
0
votes
0answers
592 views
ESP8266ex does not hold written EEPROM data, what could be wrong? [duplicate]
Solution:
Need to call EEPROM.commit() after a write cycle.
It is all about this board:
It seems to be a NodeMCU V3, however there is no version 3 mentioned in the board list (also update board list)...
0
votes
3answers
870 views
Extending EEPROM life
I'm working on some software using an Uno (ATmega328P). I have a stage byte that can be 1 of 5 values (0-4) in my code and it will increase by 1 every 2.5 hours. If I lose power I need to ensure that ...
1
vote
1answer
488 views
Integer looping in EEPROM Read
I am reading data from a 24LC1025 over I2C with an Arduino and then outputing that data to my PC through the Serial interface. The EEPROM chip is seperated into two pages and at address 65535 [0x0FFFF]...
2
votes
1answer
444 views
Writing data to a specific address in EEPROM
I'm trying to write two strings to an Arduino Uno's EEPROM. Here, the first code block works fine: it writes string(True/False) at 'address 0'. But the second block, which writes data at 'address 5', ...
1
vote
1answer
446 views
Reading and comparing data from Arduino Uno EEPROM
I'm trying to read compare data from EEPROM (Arduino UNO). Reading is working fine but comparing it using the '==' operator is not working as expected.
//string 'True' is already stored in EEPROM
...
0
votes
1answer
88 views
EEPROM - Arduino
In my recent project, I want to store values permanently. So for that, I want to use the EEPROM. I searched for it and read about it. Now, I have some questions.
Questions:
How many locations ...
1
vote
1answer
309 views
Object Sensor on conveyor belt (want to record the data in EEPROM for testing)
void setup ()
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
pinMode(LED_Blue_pin, OUTPUT);
pinMode(LED_White_pin, OUTPUT);
Serial.begin(9600);
digitalWrite(LED_Blue_pin, LOW);
digitalWrite(...
-1
votes
1answer
45 views
how to check 24c32 eprom is connected or not to arduino runtime?
I want to check it on runtime if runitme i remove eprom then it shows "please insert dongle " also tried using while loop showing eroor.. How can i solve it?
Wire.beginTransmission(80);
error = ...
0
votes
1answer
733 views
How to read ASCII values from AT24C32 IC using Arduino? And what is serial.begin(?) in that EEPROM?
#include<Wire.h>
#include<Eeprom24C32_64.h>
#define EEPROM_ADDRESS 0x000
void setup() {
Serial.begin(9600);
eeprom.initialize();
const word address = 0x000;
const byte count = 94;
...
2
votes
2answers
5k views
How to save a float variable to the eeprom
This is my first post here and I'm hoping there are some arduino hobbyists here to help me.
Does anyone here know how to save a float variable directly to the eeprom? If so could have a look at the ...
1
vote
4answers
2k views
Read float and long from external EEPROM chip
I am using an Arduino to read information from an EEPROM chip over I2C with the code I found here:
https://playground.arduino.cc/Code/I2CEEPROM
It works great for int and char values but I also need ...
-1
votes
1answer
204 views
MySensors GatewaySerial code not compiling [closed]
I am trying to compile GatewaySerial code from MySensors library for my Arduino Leonardo and it gives me EEPROM errors.
Gateway code:
/**
* The MySensors Arduino library handles the wireless radio ...
0
votes
2answers
92 views
What values are the Atmel MCUs EEPROMs preloaded with?
I have checked with two datasheets: one for some ATMegas and one for some ATTinys MCUs and could not find what the EEPROM.get() call would read back if the EEPROM was empty (or contained default ...
1
vote
0answers
669 views
Set EEPROM to initial values when flashing ESP8266
I have a variable uint8_t a_ram which needs to be initialized from the EEPROM variable a_eeprom when the ESP boots up. Whenever a_ram changes, the new value has to be stored to the EEPROM (a_eeprom), ...
3
votes
1answer
7k views
How can configuration values be stored on an ESP8266?
I have a project that uses an MQTT service, and I'm wondering how to best store the configuration settings (server, user, password, port) for the service as right now they are just hard-coded into ...
0
votes
1answer
449 views
Reconnect to I2C with a different address (ATTiny85)
My project requires to reconnect to an I2C bus as a slave. I can't reset my ATTiny physically because I2C + my project + a pin to trigger the reset isn't possible due to the limited amount of pins ...
1
vote
2answers
1k views
does EEPROM.write() only writes changed data?
Do I understand the code in EEPROM.cpp / write() correctly, that val is only written to the EEPROM, if val differs from the current EEPROM contents at the given address?
And if the answer is yes, ...
0
votes
1answer
777 views
Not sure why eeprom isn't reading back correctly
I'm new to saving data on eeprom and I'm obviously doing something wrong but I'm not sure what. I have one program which both writes to and reads the internal eeprom on a attiny85 and this seems to ...
1
vote
2answers
988 views
Problems Writing and Clearing 24FC512 EEPROM using Arduino Uno
Solution:
Majenko properly pointed out that I was trying to write across page boundaries and either overwriting or skipping blocks of the EEPROM when I did. This updated write function checks for a ...
2
votes
4answers
2k views
Storing a counter to EEPROM - how to extend the life?
I am building a circuit that has a button, which when pressed, should increment a counter. I want to store this counter so that when I power off my circuit, it can be read when I power it back on. ...
2
votes
1answer
1k views
Saving EEPROM after programming on Arduino uno
I am using an Arduino Uno, and I use the EEPROM to store some presets. It works fine. But, when I reprogram the Arduino, the EEPROM gets wiped out. Is there a way to prevent this, and have the EEPROM ...
2
votes
1answer
7k views
String to persistent memory (EEPROM?)
I am creating a server node that I want to be able to save the wifi SSID and the password into persistent memory so that when it starts ups it can connect to the network. I have looked for several ...
0
votes
2answers
190 views
Understanding bitwise operations [duplicate]
I am wondering what the second line of code does:
int16_t GyX;
GyX=Wire.read()<<8|Wire.read();
Also, how can I write the GyX value to EEPROM?
From what I understand, int16_t is a two-bytes ...
0
votes
2answers
4k views
Splitting a string read from Serial into parts
Is there any method with which I can split a string given by Serial.read() into an array of 3 items: [command, address, message], to write it to EEPROM?
Thanks.
0
votes
1answer
223 views
How do I erase internal EEPROM on a Arduino Pro Mini
I'm working on Arduino pro mini.
and I store some data in internal EEPROM.
So, I want to erase certain data from 0x00 to 0x28 address in EEPROM.
void loop()
{
...
...
if(erase_eeprom_flag==1)
{
...
3
votes
4answers
1k views
Is it possible to save different values on address 0 and 1 in EEPROM?
I want to save different values on address 0 and 1 on eeprom I tried to change it but when I put data on address 0 and also put data on address 1 the address 0 change its value stored into random ...
1
vote
1answer
360 views
EEPROM PUT and GET audio playback
I am new to Arduino.
My project is an electronic piano that has 8 tactile switch keys that can play 8 octaves. I want to record a song that a user plays on the keys into EEPROM. I have implemented it....
0
votes
2answers
45 views
How do I sense that the serial monitor is started?
When starting the serial monitor in IDE I want to save important data to EEPROM before the Arduino Uno restarts. I do not have physical access to the Arduino so a "press button" solution does not work ...
2
votes
1answer
2k views
Arduino EEPROM retains old data after flashing with a new program
I have a custom 5V 16Mhz Arduino Uno (a breadboard Uno of sorts) that runs the grbl firmware. After the initial flashing I can see all the settings (through the serial monitor) and everything works. ...
2
votes
0answers
940 views
Using EEPROM to write a counter value
I have made a program that increments a counter everytime the up button is pressed. I am trying to write this value to EEPROM, so that when I turn my board off and on again, the value before power off ...
-2
votes
1answer
217 views
Sketch Memory and EEPROM
Since I'm running out of sketch memory, I've decided to use the 512 bytes of EEPROM memory by using EEPROM.put(addr,variable). But every time I use this my sketch memory use in gradually increasing. ...
1
vote
1answer
33 views
Persistence of user input after reboot
I am creating an application where user input is required. After a user browses through available choices (via buttons and LCD) depending on the choice of the user a function is run from several ...
