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.

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I want to modify setup, to also keep the serial USB port opens so I can send strings via a Raspberry Pi

I am trying to modify the original code from these guys GRA & AFCH, who have made an Arduino Sketch Program that runs a Arduino powered Nixie Clock. Here is the link to their Firmware file:...
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2k views

save bytes from Serial into ROM (EEPROM)

I am trying to save an incoming text from serial into the ROM of the Arduino using EEPROM. I found out that you can only save a byte at once. So I thought I could do it like that: #include <EEPROM....
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57 views

Where to store critical data in power outage situation on ESP8266

I want to store a counter that is always changing, but I want it to remain and being able to retrieve it on after a power loss. It's only one long number data, but as it is always changing, I don't ...
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ESP8266 EEPROM Reading extra character

I am very very new to ESP Programming. I am trying to store Strings into EEPROM of ESP8266. I am storing the string into eeprom successfully but while reading it from EEPROM extra character 'd' is ...
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189 views

Stuck in a loop when reading from EEPROM, works if I clear it first

EDIT: The problem was caused by storing a pointer in the EEPROM. Thanks to @KIIV for helping out Sorry for the enormous of wall of text, I'm trying to pare it down a bit. I have two Arduino Megas ...
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72 views

I can't write or read data in an external eeprom

I've been trying to store data in an external I2C EEPROM but it doesn't seem to work, and i don't know why. When i run the i2c scanner it founds my memory but i can't write in it, or at least it ...
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64 views

EEPROM Esp8266 Memory Issue

I had assembled a board with esp8266ex bare chip with 4MB eeprom for esp and also can be shared with host MCU. I had gone through some googling and found that using eeprom function I am able to write ...
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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; } ...
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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 ...
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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), ...
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534 views

Arduino EEPROMex library problem

I am trying to write a float value to the EEPROM on an Arduino MEGA2560. According to some research I should use Arduino EEPROMex library. I added the library to Arduino, but I get the message "EEPROM ...
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603 views

Program/Read 93LC46B with an Arduino with bit-banging

I'm Tom. I'm pretty new to electronics and programming but I've been getting better. So, recently I bought a 93lC46B EEPROM from Element 14 (It was $0.28! Why not!). I've been doing some research and ...
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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 ...
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168 views

Read & write on Winbond SPI flash using Arduino UNO

Recently I have brought a original UNO for modifying and flashing various types of bios. I had a dedicated one click bios programmer which was very expensive but few days ago it failed. So I thought ...
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130 views

Using of a One Wire EEPROM DS2431 with arduino nano 33 BLE

I am trying to use an EEPROM DS2431 with my arduino nano 33 BLE. I have put it on the D3 pin, with a 4.7k pull up resistor. I am using the DS2431 Library for arduino and the OneWire library. I have ...
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How to use an HTTP GET method to download large file/s (upto 8MB) to an external EEPROM of ESP32-WROVERB?

I have a custom made chip which has a ESP32 WROVERB chip. The chip has an external flash memory/EEPROM of 256Mb (32MB). My task is to download a large .bin file from the internet (say dropbox.com) and ...
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65 views

EEPROM Arduino library for ESP8266 is not working

I am trying to use EEPROM library from Arduino framework for my ESP8266 project (NodeMCU). I am using Atom with Platformio. Initialization of EEPROM is attempted at void setup() in main.cpp: EEPROM....
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NodeMCU EEPROM Stored Datas Deleted Suddenly

In my project i am using nodemcu board.It is clone of Adafruit's huzzah. Last days i faced a problem about eeprom. 1- I have some data and i have to save this datas on eeprom. 2- Data types are ...
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How to use NVM or EEPROM on SAMD51?

I had to upgrade to Arduino Grand Central M4 ( running SAMD51 ) due to large code and demanding memory . I know SAMD51 does not have a classic EEPROM but it still has NVM for user data storage between ...
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2answers
110 views

Arduino Uno SD card storage

I am interested in storing accelerometer data to an SD card. Since power consumption is the main consideration of my project, it is important to do as few writes to the SD as possible, because the SD ...
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190 views

Write to EEPROM takes too much time

I wrote this simple function to store some parameters into the EEPROM, using the STM32Duino core: #define BASE_ADDRESS 64 typedef struct { float a; float b; float c; } settings_t; ...
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332 views

Reading/Writing salvaged EEPROM

Recently I stumbled myself on a fairly old blood sugar test strips canisters. Inside them, I found this what they called "Code Card" which inside, an EEPROM Microchip 93LC46B a 1K Microwire compatible ...
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1answer
1k views

Can't read from / write to EEPROM

I'm currently trying to write to and read from an 25LC256-E EEPROM with my Arduino Uno via SPI. I've made a program which is supposed to do this, but I only get weird answers. I'm sending in a Serial-...
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1answer
91 views

EEPROM not consistent over reboot

I'am using a Wemos D1 mini V3.0.0 (esp 8266 core). I tried to save a structure in EEPROM memory but all data are lost when i reboot the board. I am using these basics functions : int cle_verif = ...
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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, ...
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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 = ...
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1answer
236 views

Trying to read a 93lc46b chip using Arduino

I am trying to read a 93lc46b EEPROM chip using Arduino. I am reusing the code from http://owlsan.blogspot.de/2012/10/accessing-93c4693c46n-serial-eeprom.html, except I have modified it for 93lc46b ...
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1answer
186 views

Write and read problem while interfacing 93LC46B EEPROM through SPI

I try to save and read data from 93LC46B EEPROM using SPI with Arduino UNO. I'm following this article https://www.arduino.cc/en/Tutorial/SPIEEPROM . So far I have correctly connected EEPROM pinout (...