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Questions tagged [memory]

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Use this tag for memory management or issues in programming.

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There is a simple PlatformIO sketch (arduino format) that has the following main.cpp file: #include <Arduino.h> #include "esp_camera.h" #include "camera_pins.h" #define ...
Broteen Das's user avatar
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I am working on a custom SD card data logger using the following function and struct: char *filenameCreator(const char *prefix, const char *num, bool addExtension) { char *filename = (char *)...
Daniel Melendrez's user avatar
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I know that with 8-bit AVR Arduinos, std::string is widely regarded as fundamentally unsafe due to problems with heap-fragmentation (partly due to limited ram, and partly because the WAY the ...
Bitbang3r's user avatar
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Consider the following code: #include <Arduino.h> unsigned char testimage [] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, ...
Bart Friederichs's user avatar
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I'm measuring accelerations at "high frequency" (4kHz) from an accelerometer (ADXL355/ADXL357) to an esp32. It's crucial that no sample is lost while performing a measure which last say 2 ...
AlekseyFedorovich's user avatar
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I'm doing a small project with ESP32 board. When initializing a driver, multiple structs are passed to initialization functions. I know that there are two ways to store such structs: Storing structs ...
Yiyang Yan's user avatar
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I am currently working on an assignment for my embedded systems course, and my professor has asked us to determine the memory allocation technique employed in Arduino. Specifically, I need to identify ...
Noran Hany's user avatar
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I'm trying to get my Lilygo T5 4.7" epaper to deep sleep for 12 hours. But I only seem to be able to get about half an hour (2100s) of deepsleep on it. If I set the timer for longer, it just ...
Engberg's user avatar
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I have some really long global variable arrays filled with data. There is a single function that processes the data. The function works on only one array everytime. This arrays value changes every ...
user1584421's user avatar
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I'm trying to read data being transferred via Infrared from my Smartmeter on my ESP8266 using the following sketch: #include <ESP8266WiFi.h> #include <ESP8266WebServer.h> #include <...
1_am_r00t's user avatar
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I'm a dairy farmer and I'm new to playing around with Arduino's. I created a code to send me SMS's when my equipment stops working as it should, but I run into a "Not enough memory" error. ...
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Probably I'm doing something wrong. I'm writing an Arduino sketch for ESP32. Among the others I have this function: #define HDR_MAX_LENGHT 4 #define CMD_MAX_LENGHT 5 #define ARG_MAX_LENGHT 5 #define ...
Mark's user avatar
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I am working on a simple data acquisition system based on an Arduino Uno. Each run would ideally collect up to 10k data points (all doubles). Obviously, the Arduino doesn't have the capacity to hold ...
Ben's user avatar
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I am working on a simple project on talking to the serial monitor, and my only global variable ("int" type, named "incomingByte") is consuming a lot of memory. There is no problem ...
Vitor Z.'s user avatar
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Using Nano's for small programmes I get compilation reports about the amount of space taken by global variables. On a typical progamme it says something like Sketch uses 16316 bytes (53%) of program ...
Harry J Crowley's user avatar
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This sketch only displays about nine images (when there are more). Does this mean the ESP32 is limited amount of Base64 images able to be displayed? #include <WiFi.h> #include <WebServer.h>...
adamaero's user avatar
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When unplugging the power source of a device that is writing some data "A" to an SD card, also other data "B" might get corrupted. (This is detailed here.) Regarding Arduino ...
root's user avatar
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I need to save some values (and be able to update them frequently) that will stay there even after powering down the Arduino. (I didn't specifically choose any board yet, but UNO or Mega will be ...
krystof18's user avatar
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First, please be patient, I'm not electronical person. I am learning Arduino and electronics for hobby and this is my fist time with integrated circuits. Situation: I'm want to extend the Arduino ...
faanbece's user avatar
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1 answer
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Disclaimer: I just started using C++ and I'm a bit of a beginner. Keep that in mind as your answering. So I recently bought my first Arduino. It's a customized one and it has an 8x8 display attached ...
gurkensaas's user avatar
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5 answers
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I'm trying to transfer data between a Arduino Uno board to a NodeMCU ESP8266 board, using nRF24L01+ transceivers module and RF24 library on both side. The data I'm transferring are stored in a struct ...
Vincent's user avatar
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I'm trying to use my Arduino Mega as an EEPROM memory writer. For this project, besides my Arduino Mega, I use an SD Card module, an LCD display and two push buttons to handle the events. Inside the ...
Dan Fayal's user avatar
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I have an Arduino program written for the nRF52 with which runs for a pre-set time-value (i.e. 2 minutes) before shuts off automatically. The variable time-value can be changed via BLE-write by the ...
TommyS's user avatar
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I've read that the Arduino String is bad as it causes memory fragmentation, so I try to avoid them mostly. But I still have some occurences where I'm not quite sure if they are ok after all. The first ...
matthesinator's user avatar
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I have this sketch: const uint32_t len = 65536; uint8_t arr[len]; void setup() {} void loop() {} The length of the array should fit into the dynamic memory. However, when I compile the sketch it ...
LukasFun's user avatar
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https://infocenter.nordicsemi.com/pdf/nRF51822_PS_v3.4.pdf The aim is to extract (output in serial monitor) the start up bits from the SRAM of this microbit which is located at memory address ...
kepsek's user avatar
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I bought myself a WEMOS D1 mini PRO (16MB) for creating a quite large project. As I'm writing code, my memory is starting to grow. When I looked at the Flash size in Arduino IDE, the only options I ...
Jens Vanhulst's user avatar
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2 votes
4 answers
356 views

Since I'm very used to object oriented programming, I would like to use this into my design. My application will have 4 led strips and each led strip will have a 'pattern' running on it. For this I ...
Michel Keijzers's user avatar
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1 answer
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I know this is simple basic C stuff, but I can't quite figure it out or find a solution when searching and reading. I have a method I want to call from a library that wants a const char pointer ...
Chris Schmitz's user avatar
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1 answer
237 views

I have an Arduino project (data logger intended to sample 100 samples per second for months) with firmware that is too long to post. It mostly works as supposed to, but I have a confusing issue I can'...
Vulcan's user avatar
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1 answer
517 views

So I understand that generally speaking, dynamic allocation should be avoided. My question isn't how or why, but what happens when you call a function that allocates memory? On Windows or Linux, when ...
Dan Forever's user avatar
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2 answers
8k views

I am using Free RTOS on ESP32 in my program. However at some point of time when I execute xTaskCreate() it returns -1 , the error being could_not_allocate_required_memory. In my program, each time I ...
Androing's user avatar
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1 answer
633 views

I am writing a GUI using a TFT display and the Adafruit GFX library and its default font on Arduino Nano. I want to be memory efficient and I assumed that the 'optimise for size' default setting of ...
WildCat's user avatar
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I've never used arduino before but am using one for a school project. I am using an arduino leonardo and I've uploaded the sample code below #include "Adafruit_CCS811.h" Adafruit_CCS811 ccs; ...
Screenwriter Marc's user avatar
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1 vote
1 answer
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I am trying to save a string/char to EEPROM with EEPROM.put() and then get the value, but it doesn't work and I get a blank value when I do a EEPROM.get(). I remember this is how it worked on arduino ...
adrianTNT's user avatar
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2 answers
105 views

I'm inspecting where the memory is used in an application which runs on Arduino. To my surprise, there are several locations where 100 to 200 bytes are consumed by simply calling a function. Example: ...
Arseni Mourzenko's user avatar
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2 votes
1 answer
380 views

Well, first of all hello to everything and thanks for reading my question. I am designing a board with STM32F730R8T6 MCU, and I want to connect MT48LC16M16A2P-6A to it which is 4MB SDRAM chip. The ...
Valentino Zaffrani's user avatar
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1 answer
684 views

i'm trying to extend the capabilities of the Sparkfun SAMD21. My question is, which pins do I have to share? I mean, I understand that MISO, MOSI and SCK are shared, but CS connects each to a ...
Valentino Zaffrani's user avatar
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0 answers
324 views

I'm trying to create SMS alarm using Twilio, Firebase and Arduino IDE. Using sensors I am measuring the temperature. If the temperature is higher than a specified value (ESP reads that value from ...
Nina's user avatar
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0 answers
76 views

So I'm new in the arduino world but I have a grasp of object oriented programming, and decided to write a little library for running games on an arduino mega using a display. My question is, I'm ...
Juan's user avatar
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2 votes
1 answer
509 views

So I've been looking into branchless programming to speed up code and I'm curious as to how exactly Arduino (or rather atmega328) actually reads machine instructions. Does it have a memory cache or ...
Beacon of Wierd's user avatar
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1 answer
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This thought came into my mind on thinking about smartwatches. Although those I saw on YouTube are really good, they don't seem to provide a real experience of a real smartwatch - one that has an OS ...
Sam Ruben Abraham's user avatar
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1 answer
847 views

I'm trying to connect 2 SD cards to an Arduino Uno board. My first question is: Is it possible to connect two SD cards to one Arduino simultaneously? The second question is: If it is possible to ...
user67463's user avatar
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1 answer
477 views

I am using a TM1637 display for my Arduino Uno. The goal was to just light up one point of the colon in the middle - what seems to be kind of impossible to accomplish. During research I stumbled over ...
data-research's user avatar
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1 vote
1 answer
306 views

Facing an issue while writing a large value (like 2000-5000) to EEPROM using EEPROM.put(). For example, While writing 2000 values to address 5 of EEPROM. Some junk values are written automatically to ...
Mayoogh Girish's user avatar
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2 votes
1 answer
162 views

I'm trying to write a program for AVR Atmel 328 chip on Arduino Nano board that will allow me to send machine code instructions to the chip over a serial line, run/execute them on the chip, and ...
Assad Ebrahim's user avatar
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-1 votes
1 answer
365 views

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 = ...
Marco Bresson's user avatar
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1 vote
2 answers
4k views

I have been testing various techniques on an Arduino Uno for serial printing from flash memory instead of RAM. At the same time, I have been using the freeMemory() function from Adafruit. I created a ...
NickG's user avatar
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3 answers
5k views

I have following code in loop() in NodeMCU. This part is before setup(): String serial_data_read = ""; // for incoming serial string data String serial_data = ""; // for incoming serial string ...
Frodik's user avatar
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5 votes
4 answers
1k views

Is it possible for a function/method to know if a constant array that has been passed in is in flash or RAM? If I have a method or function that receives a constant array that is in RAM, the array is ...
Casey's user avatar
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