Esp32 eeprom not working From Wi-Fi connection problems to advanced debugging, we've got you covered. After the cont Espressif ESP32 Official ForumHowever, we are unable to either read or write successfully using the EEPROM library. h" float Variable_1 = 12. Sep 27, 2017 · EEPROM library not reading or writing correctly Postby longtimer » Sat Feb 10, 2018 5:41 am We recently received a shipment of manufactured boards that use the ESP-WROOM-32 module. ) and may not work for general input/output. Oct 26, 2023 · Because EEPROM is used in IoT devices, it is especially valuable when used with ESP32. get which is working fine while the Sketch is running and a "get" will show the revised "put' value. write (0, messageNumber); and later messageNumber = EEPROM. I have added the initialization sequence Sep 14, 2025 · Introduction When you’re working on ESP32 projects, you’ll often have a requirement to store data that persists even when the power goes out. Jul 16, 2021 · Are you sure it has built in EEPROM? If not you can use the flash to store data but remember it erased ech time you burn your code. get () functions I have always used it. Sep 8, 2023 · Describe the bug I try to use LVGL (v8. I want to save two custom parameters, and it seems to work, but when I restart the ESP, the parameters don't persist. Aug 20, 2020 · ESP32 with Arduino IDE and EEPROM. USB port of esp32 not powering the esp32 board after a shortcircuit happens in Vin and GND pin. i am trying to do it by doing this: for read: float distA = EEPROM. Using Arduino IDE and ESP32-WROOM with FREERTOS. Sep 23, 2020 · The reason I stuck with EEPROM. put(4, item_inside. When working with Jun 11, 2022 · EEPROM test example runs but EEPROM seems to get lost after next upload, and I have not fully tested the EEPROM retention across power cycles. The packaging of this module is different from the previous ESP-WROOM-32 that we had been using during development with markings for CE and FCC certifications now Oct 4, 2023 · hd_eeprom example dose not work in my ESP8684-DevKitC-02 1 1 kwakabayashiss Posts: 2 Joined: Tue Oct 03, 2023 6:52 am The ESP32 does not have an EEPROM as such. Nov 7, 2020 · If I run just this example EEPROM code on the ESP32 it returns the data correctly. As such, it is not going to be a high performance storage method. read (0), does not work on a Nano ESP32. 2. That includes, the WRITE, READ, PUT, GET, and buffered page examples. Please I need help thank you. I expect that if I unplug the power and plug it back after initalization the array should have the same values it had the last time it wrote to the eeprom. 0. but when I press reset button on board the Oct 14, 2022 · Hi all, Working with Arduino IDE and an ESP32 display module -- not familiar with either. ard… I just checked the code and it is working fine on my DOIT ESP32 board. But whenever I unplug my connections to the AC and to my laptop and plug it in again the data for watts per hour is lost. Jun 19, 2016 · I am using 1. The UART stops printing over the serial port and stops communicating with the other esp32. May 6, 2023 · Pretty certain you need to also send the memory address you wish to access to the device before you write or read any data. I've added a simple little boot up routine so it only outputs the data once on the serial monitor. As is suggested I'm using Preferences instead of EEPROM library but I'm stuck with how to make it right with the preferences library. end () the application crashes and reboots. Learn how to store and retrieve non-volatile data using EEPROM in ESP32. h library: values are not saved Postby Markovicz » Sun Nov 08, 2020 10:02 pm I'm really lost, any leads? SOLUTION: The problem wasn't with the EEPROM. Nov 1, 2022 · Hi there, i am trying to read / write float values to and from EEPROM on a esp32, but it just reads 0. Here is my layouted ESP32S3 Wroom-1U-N8R8 module : For my functionality (i. My Arduino-Code works since I tested it successfully on a Seeed Xiao-ESP32S3. After half a day of Googling and testing, I have not been able to get any of the included EEPROM examples to work on a Blue Pill (STM32F103C8T6 ). Dec 30, 2020 · I'm trying to write some values to the EEPROM on an esp32 but I just get zeros after reboot up. In order to improve this reading I have made a new algorithm that seems to work much better but the esp32, some of them stop working after random time. h> #define DOUT 5 #define CLK 6 Sep 18, 2021 · ESP32 Flash Memory to Save Permanent Data Write and Read September 18, 2021 In this tutorial, you will learn how to save and retrieve data from the ESP32 flash memory using the Arduino IDE. com/esp32-flash-memory/. In my code, I am trying to access an external EEPROM at positions writing data from 0 to 10000 position data is = '1'. Then you may have to wait some time for the device to complete the write operation before accessing it again. Oct 4, 2023 · Re: hd_eeprom example dose not work in my ESP8684-DevKitC-02 by kwakabayashiss » Mon Oct 16, 2023 9:35 am Thanks for the great work to this library ! I make use of the library in an Arduino (v1. Any thoughts on why this is happening? I'm trying to understand how to read/write a UID struct from miguelbalboa to EEPROM to persist a card ID across system restarts on my ESP32-S3 through the Arduino IDE. " and later UKHeliBob suggested LittleFS. See full list on deepbluembedded. write). Obvious advantages: really convenient and simple interface you can create several independent objects with different structure in different areas of flash memory rotation not only between several pages, but also within one page - tens and hundreds of times reduces memory wear maximum light Some pins on the ESP32 have specific uses (like flash, boot, etc. com Feb 9, 2018 · However, we are unable to either read or write successfully using the EEPROM library. Have a look here for more information. If not means how Jun 10, 2020 · On a related note, I have been able to get basic EEPROM read/write to work by following this tutorial so it doesn't feel like a board issue. No installation required! In this video I show how to repair the Esp32. h" #include <EEPROM. Can anybody assist please? #include <EEPROM. I don’t have a NodeMCU-32S board to experiment with, so I’m not sure if it is any problem related to that specific board. get (sizeof (float) * 0, distA) > 0 ? EEPROM. restart May 8, 2023 · The problem is that just by declaring the EEPROM library or preference, the UART stops working after some random time. e. Aug 9, 2017 · Hardware: Board: ESP32 Dev Module Core Installation/update date: N/A IDE name: Arduino IDE 1. C write NVS storage not work Postby lbernstone » Sun Jun 19, 2022 8:41 am Known bug; will be fixed in 2. There is a new library for convenient typed work with "EEPROM" emulated in flash memory. h> #include <U8g2lib. Jul 6, 2023 · I'm working with ESP32 Wroom-32 and AHT25 temperature and humidity sensors. write() function that accepts as arguments Sep 16, 2020 · Hi, I'm new to ESP32 and Arduino, but I know a few bits about programing Atmel micros. begin() and EEPROM. With both read and write, no errors are generated and the esp_partition_write call in the commit () function is returning a 0/ESP_OK response. Again, I ask, does this work if you write to flash. h library functions, successfully done with writing data and reading data. Writing to it every couple of seconds will likely wear it out pretty quickly - it’s not a good design choice, especially if you keep rewriting the same location. Re: ESP32-C3 EEPROM. From the codebase: “EEPROM is deprecated. Jan 28, 2024 · I am making a project, in which I need to store the WiFi credentials to the EEPROM. The program is derived from the Blink example and the setup is:. Oct 3, 2023 · hd_eeprom example dose not work in my ESP8684-DevKitC-02 1 1 kwakabayashiss Posts: 2 Joined: Tue Oct 03, 2023 6:52 am Jun 20, 2023 · Greetings, I have to write specific variables to an i2C EEPROM and i am only getting the last 'half' of my string written to the EEPROM. Nov 8, 2020 · Hi, im not a master but i have been trying the last few days to store data on the ESP32. But on the Wroom-module, I can't get the application to work. I setup SPI by using code below. So it appears Adafruit QT Py ESP32-C3 is not currently usable for any project that requires a file system/storage. This is my code: Jan 24, 2022 · Im using a LOLIN32 Lite board, and it seems that i lose stuff that's stored in the EEPROM every time i flash a new version of my code onto it. Aug 21, 2020 · EEPROM. No EEPROM data is changed during program execution once the initial setup is done. Whatever I try, I keep on getting a returncode 'false' from the EEPROM. This needs a calibration that needs to be remembered when power goes off. begin (8192) was not failing, which is why I was confused about what was going on. 4. As I read online the ESP8266 has no real EEPROM, it use a section of FLASH just after the SPIFFS. The specs will depend on the specific SPI flash chip, but they’re likely to be closer to 10,000 cycles than 100,000. I am not thrilled about having to re-write code just for simple single byte read/writes to permanent storage, but I guess Mar 24, 2021 · ESP32 EEPROM not persisting across resets. Hello guys, In this video, I will show you how you can factory reset, erase the EEPROM and bootloader repair of ESP32 board so that it can restore to the initial version. With the ESP32 and the EEPROM library, you can use up to 512 bytes in flash memory. #11284 Jun 6, 2024 · The ESP32 series employs either a Tensilica Xtensa LX6, Xtensa LX7 or a RiscV processor, and both dual-core and single-core variations are available. EEPROM is provided for backwards compatibility with existing Arduino applications. write (add, data) After this EEPROM write, then call the ESP. I'm using the tft_eSPI library to interface with my ST7796 display driver. put () and . Jan 19, 2019 · Hello Having a problem consistently resetting or restarting ESP32-WROOM module. If you are coming from Arduino land where you are familiar with the eeprom library and . However, Mar 6, 2023 · ESP32-CAM Factory Reset, Erase EEPROM etc Postby henkoegema » Mon Mar 06, 2023 8:42 pm How can I Factory Reset, Erase EEPROM and Repair Bootloader using ESPtool for the ESP32-CAM ? I can do it with esptool for the ESP32, but not for the ESP32-CAM. To write data to the flash memory, you use the EEPROM. Only about 32 bytes made up of integer variables. 6k Star 15k 118 Sep 5, 2022 · SAMDs don't have EEPROM. 0 IDE Name Arduino IDE Operating System Windows 11 Fla Nov 21, 2023 · The EEPROM. Do I read all the written values without problems except one, an integer with value 365 do I read it 109 ? I can't figure out why, can anyone help me figure out the problem? Using Arduino ver. Run IoT and embedded projects in your browser: ESP32, STM32, Arduino, Pi Pico, and more. Preferences works best for storing many small values, rather than a few large values. it comes write ok response ,but if we read from that particular location data comes 0xff which means not written. I have the following code Dec 2, 2020 · I'm working with an Adafruit Huzzah Feather ESP32: I need to store some information between power cycles. 36; //Dummy value int Eaddress = 0; boolean Oct 17, 2017 · Hardware: Board: ESP32 Dev Module Core Installation/update date: 11/jul/2017 IDE name: Arduino IDE Flash Frequency: 40Mhz Upload Speed: 115200 Description: I am not able to generate the I2C clock. Additionally, I test out some of the tft_eSPI library's demo examples, and Feb 7, 2024 · Hey all, Working on a project with an esp32(wroom) and I need to store some data that will be entered during the program. write only works with individual bytes (0-255) of memory and I have to manage it, which is OK. Unlike traditional EEPROM, the ESP32 emulates EEPROM using a portion of its flash memory, allowing data to persist even after power cycles. I want to save some data to EEPROM, to retain that value even when the device is switched off. Later I send 4 bytes Feb 20, 2023 · Hi, I'm buiding a project where I need to log some data in NVR for laters uses. Is this normal? Im using the PUT & GET examples from here : https://docs. //first upload #include <Arduino. https://randomnerdtutorials. commit() and the values are not written to EEPROM. I have one code that is running correctly with no problem but the detection of the hx711 is not accurate enough. This tutorial covers the EEPROM library, reading and writing techniques, and practical Discover ESP32 projects on Sarkitshala. Set flash mode to QIO. I have got exactly the same problem on both. Jan 20, 2020 · The ESP32 doesn’t have an actual EEPROM; instead it uses some of its flash storage to mimic an EEPROM. end(), The moment I switched the begin before the first call of EEPROM, and the end after the last call, all started working properly. h is to maintain consistency across devices including Uno, Nano, Micro, Mega2560, ESP8266 and ESP32, although only the WiFi devices run a webserver. SPI works on Arduino but it does not on ESP-IDF. I'm using VS Code IDE and platformIO extention for development. Nov 4, 2023 · The same code, namely #include <EEPROM. That was my post LittleFS was difficult to use for me in the beginning due to lack of knowledge on my side for char arrays and ESP32-WROOM-32 D1 MINI EEPROM CODE NOT WORKING Hey guys I just want to ask what is wrong with my code because my code is supposed to store my preview watts per hour that I recorded. I believe that . 13) script for the wemos mini D1 Pro. put. It uses a portion of the on-board non-volatile memory (NVS) of the ESP32 to store data. ino example code with LV_demo_widgets(). It includes in-built antenna switches, RF balun, power amplifier, low-noise receive amplifier, filters, and power management Sep 25, 2024 · I have an ESP32 controller and am using AT24C1024 for communication. write and EEPROM. This gives you 512 addresses, and at each address resides a value that is a number between 0-255. C write NVS storage not work by lbernstone » Sun Jun 19, 2022 8:41 am Troubleshoot missing serial port issues when your ESP32 is not recognized by your computer. Searches have led me to both EEPROM. C write NVS storage not work by lbernstone » Sun Jun 19, 2022 8:41 am Feb 4, 2024 · Hello guys! I'm working on a scale for my coffee grinder. I've almost completed it, but I have one more issue to address. put / EEPROM. 36; // dummy value float Variable_2 = 10. Jan 27, 2024 · Hello, I have got XIAO ESP32S3 and ESP32-WROOM32 units. I need to store the temperature and humidity data using EEPROM. Why are you using an eeprom when you have megabytes on board the esp32. Feb 10, 2023 · I wrote the code based on the page https://randomnerdtutorials. Feb 26, 2023 · I need to write and read an array[3][12] of integers, but I'm having a problem reading or writing but I'm not sure where it happens. It should be considered as the replacement for the Arduino EEPROM library. Unfortunately that is not the case. Having a weird problem the EEPROM (which I gather is just a set-aside chunk of the main FLASH memory) having "too durable" EEPROM retention. That said, since the esp32 arduino core does have an included eeprom library which supports . I bought an ESP32-WROOM-32 and i realize that there are some things who are not the same comparing to Arduino Nano,UNO or Mega. EEPROM not working as intended Hi, I am working on an application with an ESP32 with ADC converters. get (s… Sep 2, 2018 · Hello, I am porting a SW from ATMega to ESP32 and have some difficulties with the EEPROM as apparently nothing is stored. Version v3. the array has values in it, and if i set the write variable to ture, the values should be written to eeprom. Have 2 TASKS running, a main task and a WiFi task and on a post or get I write up to 50 bytes of data using the (SPIFFS) with the method EEPROM. Apr 28, 2025 · Interface the ESP32 with DS3231 Real Time Clock (RTC) Module to do timekeeping, set alarms, output square waves with different frequencies, and get temperature readings. For new applications on ESP32, use Preferences. put() function, but with the frequency with which I was calling EEPROM. May 3, 2021 · The EEPROM is an internal memory of the ESP32 microcontroller that allows to keep in memory data after restarting the board. Jun 19, 2020 · Hello, I am new to esp32, I am using esp32 dev module. And it will record two pair of values for each measure: Timestamp in unix format and the Alkalinity Espressif ESP32 Official ForumHowever, we are unable to either read or write successfully using the EEPROM library. Both of these seem to work fine for integer variable, However, EEPROM. Mar 16, 2024 · Hello everyone. In general, you should have no problems with the official esp-idf development boards. get did not work Also, can someone help me understand when should I use EEPROM. However when I tried running my original EEPROM code in the project code it does not work returning values of 0. This is the first program I upload. I tried using the simple LVGL_Arduino. The ESP32 series employs either a Tensilica Xtensa LX6, Xtensa LX7 or a RiscV processor, and both dual-core and single-core variations are available. However, the developers of the ESP32 Core for Arduino included an EEPROM library that emulates the behavior to make it easy to use. static May 6, 2021 · espressif / arduino-esp32 Public Notifications You must be signed in to change notification settings Fork 7. This does not determine anything if there is an error on the board. If Jul 19, 2023 · closed this as completed on Jul 19, 2023 Ccccraz mentioned this on Apr 23 The Preferences function of ESP32-S3-WROOM-1U-N4R8 in USBHID mode does not work. Whether it’s WiFi credentials, sensor calibration values, user preferences, or logged data from your latest environmental monitoring project, non-volatile storage is essential for creating robust applications that retain their data even when power Jun 19, 2024 · Learn how to use EEPROM, short for electrically erasable programmable read-only memory, on Arduino boards. I'm using ESP_EEPROM version 2. h> #include "HX711. It and includes in-built antenna switches, RF balun, power amplifier, low-noise receive amplifier, filters, and power management modules as well. No errors occur, but subsequent attempts to read the flash just written always read as high bits giving 0xFF bytes and 0xFFFF shorts for Dec 12, 2023 · The correct tool for troubleshooting this is a logic analyzer, where you can see the conversation happening b/w the devices. I use ESP-IDF 5. For now, I think it is purely software that causes the misfunction. a normal power-up. Nov 18, 2024 · I am using an ESP32- Wrover module with the eeprom. I want to save some data to EEPROM, to retain that value even when the device is switched OFF. May 8, 2023 · The esp32 needs to detect if there is a human on the load cell. I have been testing this with the code below, but the value is reset everytime the board restarts and with every power cycle. This will completely do May 30, 2022 · I'm new to the STM32 but have some experience with emulated EEPROM on the ESP32. h> #include "EEPROM. I have tried to connect the ESP32-CAM via Arduino UNO, via FTDI and via ESP32-CAM-MB. But, if I stop and start again, it has cleared the EEPROM and uses the default values. Learn how to verify the USB connection, install the correct drivers, and check for cable or hardware problems that prevent the board from appearing in your IDE or OS. For now, I am able to store a bool array in the EEPROM, but I am not able to store the char variables as the ESP32 Jun 28, 2021 · I only posted the relevant code. h EEPROM emulation library to store program constants and other settings used during progam execution. I have the following code that I use all the time in my small projects with Arduino boards. write does not compile with string as it expects integer. No errors occur, but subsequent attempts to read the flash just written always read as high bits giving 0xFF bytes and 0xFFFF shorts for I'm working on project which require to save some data into the EEPROM. This might be useful if you want to delete any changes made to the firmware or configuration settings. external peripherie) to work, I need ESP32 Troubleshooting Guide Expert tips and interactive solutions for common ESP32 issues. For reasons, I need the chip to distinguish between a power up after just having been programmed vs. below are configuration details. All EEPROM examples I could find work OK. Storing the data on an SD card would work, but not with the EEPROM functions/library. I don't think ESP32 has internal EEPROM. EEPROM is implemented using a single blob within NVS, so it is a container within a container. Jun 1, 2019 · Using ESP32’s Flash Memory for data storage The ESP32 has about 4MB of internal flash memory and since the data stored within the flash memory is retained even when power is recycled, it becomes super useful for applications where you need to keep certain amount of data even after power off. the whole array is initialized at 0. And make sure the part is not in write-protected mode. Normally with PICs I do that by checking if Re: ESP32-C3 EEPROM. Though I have used eeprom before on arduinos, I'm a bit confused on the esp32. The EEPROM library for the ESP32 has been depreciated. 8. get () you can use it. The DTR and RTS control lines are in turn connected to GPIO0 and CHIP_PU (EN) pins of ESP32, thus changes in the voltage levels of DTR and RTS will boot ESP32 into Firmware Download mode. put () and then get the value, but it doesn't work and I get a blank value when I do a EEPROM. com/esp32-flash-memory/ Mar 2, 2023 · Learn how to erase the ESP32 flash memory to restore it to its original state. Dec 15, 2017 · My problem is that if i want to write to EEPROM, after EEPROM. May 13, 2021 · I have switched my project to ESP32 board (wroom32 38 pins) from MEGA2560 and managed to adjust anything that was arduino specific but having issues with EEPROM. This is my project: Once a day, the device will make a measure of alkalinity. As an example, check the schematic for the ESP32 DevKitC development board. 9 and EEPROM. serial); enter image description here As you can see both functions, EEPROM. Im just pasting what Idahowalker wrote to me: "The ESP32 does not have an EEPROM. which indicates the serial port is correct and working, nothing else shows up on the serial monitor. 1. h>, and then EEPROM. Some places I read say it doesn't even have eeprom, others say its depreciated. 1,8,19 with STM32 WROOM 38 pins int phaseData[3][12] = { 1, 3, 10, 30 Nov 6, 2018 · Learn how to use the ESP32 flash memory to store permanent data. get (). in this we are able to read the content of EEPROM but unable to write to the EEPRPROM. commit () or EEPROM. 1 post • Page 1 of 1 michalk Posts: 24 Joined: Wed Mar 24, 2021 7:09 pm Aug 7, 2021 · I have taken I2C wires from this board and connected to my arduino UNO and I2C scanner is working there. Oct 10, 2021 · Beginner in Arduino and ESP-32 needs help. h> Jun 19, 2022 · Re: ESP32-C3 EEPROM. read and EEPROM. 1 with standard Jun 19, 2022 · Re: ESP32-C3 EEPROM. putbytes (or . Refer to the ESP32 datasheet for pin restrictions. Introduction The Preferences library is unique to arduino-esp32. I'm not sure what to make of it? So I thought I'd just outline what I need to store and let yall recommend the best Mar 1, 2021 · It's not clear to me from your snippets that you have the syntax correct. I did find that if you select the ERASE ALL FLASH BEFORE UPLOAD SKETCH option before compiling/uploading the sketch then the EEPROM works again as expected (up to 4K it seems). If the data (or rather the key for the data) doesn't exist, I set a default value and save that value to preferences. 4) with the esp32-S3, but it doesn't work as expected. In my ESP32 project I'm trying to retrieve some data from NVS using the preferences library. Maybe minutes or This article will give more in-depth information about ESP32 Flash memory and using the EEPROM library to read and write any data type to the ESP32 Flash memory. 2 Flash Frequency: 40Mhz Upload Speed: 115200 Description: Serial output: ets Jun 8 2016 00:22:57 rst: Nov 2, 2023 · The SPI does not work on my self-layouted ESP32S3 Wroom-1U-N8R8 module. The code worked, so I decided to check what maximum memory size I can enter before errors occur. These gadgets frequently work in settings where there may be power outages. ESP32 is a series of low cost, low power system on a chip microcontrollers with integrated Wi-Fi and dual-mode Bluetooth. 3. Jun 4, 2025 · Board ESP32 Device Description ESP32 Devkit Hardware Configuration No Hardware Configuration, only reading Internal Flash EEPROM. write and to Preferences. Coffee grinder in action here's the code 🙂 #include <Wire. I want to store data in internal (Flash as EEPROM) using EEPROM. I expected Put/Get/Read to be We would like to show you a description here but the site won’t allow us. We are interfacing EEPROM (AT24C256C) via i2c (address 0x50). This data is retained across restarts and loss of power events to the system. The problem is that just by declaring the EEPROM library or preference, the UART stops working after some random time. I remember this is how it worked on arduino Jul 5, 2021 · Hi, We are using ESP32C3 Rev 2 board to work our project. Due to this read/write is q Nov 8, 2020 · I am trying to save a string/char to EEPROM with EEPROM. This is what i need to write: [FzgParam] Fahrzeugadresse=123456 MontageplattenNr=9 Dummy=1 This is what my code is actually writing: 6 MontageplattenNr=9 Dummy=1 I cannot understand why I am only getting half written considering that the string is always Employing the EEPROM library with the ESP32, one can work with a total of 512 bytes of flash memory. Oct 10, 2021 · One of the things that I realized which is different is how to store and read data from the controller. 6. We have used dafault code i2c_tools. One of the things that i realized who are diferent is how to store and read data from the controler. pqwbv pbsmx tugmm qgqqgbi wvqhu hdn kcznz imqxy cfw rpuatht mlzpul omsu ucdb seriy axhkz