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.
179
questions
0
votes
1answer
229 views
How to write a float value EEPROM
I'm using this library for my DS3231 which have a Atmel 24C32 on it.
i have a float value which increases by 0.5, like:
27.50
28
28.50
...
the code is like this:
float lowTemp= 10.5
float ...
-1
votes
1answer
213 views
esp8266 esp01s EEPROM and flashing
which flash option do I need to take to use EEPROM?
Can I flash with 1MB and no SPIFFs and still write data to EEPROM?
thanks T
0
votes
1answer
655 views
DS3231 and EEPROM
Currently to get time/date i'm using DS3231 module with the RTClib library, i want to use the Atmel 24C32 chip on the module to store some small values (temperature etc).
Can i use the current ...
2
votes
1answer
51 views
Is it possible to execute a code in runtime when gets updated over the air (OTA)?
I would like to build a lib like ArduinoOTA but with no downtime at runtime. To achieve that I am wondering if it is possible to create a simple setup and loop code to
Check for new releases
If we ...
1
vote
0answers
145 views
Problem Writing/Reading EEPROM on MEGA
I want to make a program that writes on the EEPROM some structs, the final device will take structs of RGB LED data:
typedef struct{
unsigned char r;
unsigned char g;
unsigned char b;
} ...
3
votes
1answer
89 views
Best way of storing extra data for Arduino project
I am an arduino beginner and I am trying to make a speed camera alert system, it would start beeping if I am above the speed limit and getting close to the speed camera. There is this website where I ...
-1
votes
1answer
385 views
How to upload and store settings/variables from computer on the arduino? [closed]
I'm literally as green of a noob as I can be at this moment. Been watching a ton of tuts as I plan my project, but can't seem to find anything about settings being uploaded from an external source, ...
2
votes
2answers
410 views
Write faster on AT24C32
I'm using AT24C32 EEPROM chip from ATmel. I found code that will write and read bytes from chip.
Code writes and reads bytes correctly and without any problem.
But I have to write few 8-byte values ...
1
vote
0answers
176 views
EEPROM.read data not comparing with DHT11 sensor value - Arduino temp controller
I'm using a DHT11 to read temperature to control a relay that will control a fan. When 'A' is pressed it allows the user to update the temp value that the relay will go HIGH at. The value is being ...
5
votes
2answers
2k views
Run code once after programming
I'm using EEPROM to store project settings non-volatile.
After reuploading the sketch to my board (over SPI via ArduinoISP), the EEPROM is reset to full 0xFFs and I have to manually do a "software ...
1
vote
2answers
124 views
Store value in EEPROM to perform different actions on reset?
I want the same button to wake up (reset) and put it to sleep but this is hard if the button is tied directly to the rst pin. My thought was to read and store a value in EEPROM so tell the chip what ...
0
votes
1answer
143 views
What's going wrong with my EEPROM?
I've been chipping away at a project for a long time now and I've found a serious bug.
Basically the user has an 8x8 grid, and each cell in this grid has a number of properties.
I want to be able ...
0
votes
2answers
3k views
ESP8266 EEPROM seems not working, saved data are different when I try to read them
I'm working on project which require to save some data into the EEPROM.
As I read online the ESP8266 has no real EEPROM, it use a section of FLASH just after the SPIFFS. Due to this read/write is ...
2
votes
3answers
2k views
Value of uninitialized EEPROM in ESP8266?
In my limited testing it appears that the EEPROM in the Wemos D1 is not initialized to 255 like the specs say is the case for AtMega based Arduinos. In fact, the values look to be more-or-less random. ...
0
votes
1answer
453 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
736 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
573 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
1k 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
557 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
67 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
513 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
2k 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
303 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 ...
-1
votes
1answer
246 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
909 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....
4
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
585 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
1k 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
441 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
352 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
702 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
1k 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
506 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
501 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
519 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
91 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
331 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
49 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
796 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
6k 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
216 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
105 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
734 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), ...
4
votes
1answer
8k 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
534 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
955 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 ...
