Questions tagged [sd-card]

SD cards are often used with the Arduino Ethernet Shield. They stand for "secure digital cards" and fit into one's palm. They range from 256MB to 128GB, although most Arduinos only use 4GB. There are also SD micro cards, a smaller version of the cards.

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Stuck connecting Arduino uno with MCP2515 and SD card reader

Hi I am new to this world, I see that it can be a recurrent issue, but didnt understand how can I solved it. So, the MCP2515 uses the same digital pins 11,12,13 with the SD. How can I do to share them ...
LiiTo Olivera's user avatar
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More flash memory with SD card

I am pretty sure that everyone have seen the low flash memory error, the same I have got while making my raycaster. So, I was thinking that is there any way to increase the flash memory of ESP32 with ...
Aditya Roy's user avatar
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SdFat.h pin selection ESP8266

This super simple code, that saves data to a csv file, works perfectly fine on my Arduino Uno (I am using the default SPI pins). However, for my project I need to use an ESP8266. Does the library ...
NE555's user avatar
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Compressing grayscale image with ESP32-S3-WROOM Freenove

I have a ESP32-S3-WROOM module by Freenove which has a camera and a micro SD card module. I can take a snapshot as a PIXELFORMAT_JPEG photo. However, when I change the pixelformat to "...
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I can't connect a microSD card

I can’t connect a microSD card to either the Arduino or the ESP32. It needs to be connected to the ESP32; I just tested it on the Arduino to see if it works at all. Equipment: ESP32 devkit v1, Arduino ...
anon's user avatar
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Read values from a txt file on an SD card

I'm trying to read a text file (has numeric values) from SD card. The values in the file like this 87 512 255 I need to read 87 in ch1 and 512 in ch2 and 255 in ch3. Why did I get on 'SKIP_NONE' '...
stella's user avatar
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SD Card Mount Failed with Waveshare ESP32 using Arduino IDE

I'm currently working on a project using an ESP32 (the Waveshare ESP32 Driver Board), and I am trying to read data from an SD card, but consistently getting a "SD Card Mount Failed" error. I ...
Mike Buss's user avatar
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COM disconnects and program fails when including code trying to initialize SD card (RP2040 Pi Pico W running Arduino)

I'm having an issue where anytime I run a program such as the SD card read write example (Below) the COM port disconnects. The only changes I have made to the example code is I am using SPI1 instead ...
Rian Noble's user avatar
-3 votes
2 answers
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How to estimate the storage room for txt file when writing data to SD card module? [closed]

I'm planning to use Arduino UNO to do some measurements and record it in a SD card module. The measurements is going to last for a year or 20 month. I need some advice on how to estimate how long can ...
jjk's user avatar
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Read one byte from file and convert to decimal

Ok, I'm fairly new to Arduino and I'm trying to read bytes from a file in an SD card and convert to integer values (0-255). I have a file, with 1 byte on it (128 int value, created in Python, can ...
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Arduino MEGA crashes with Ethernet shield to connect to two TCP servers

I have Arduino MEGA with Ethernet Shield and a SD card connected to a RUT950 GSM router. Then, I also have two sensors connected to the router and they run a TCP server that sends measurements ...
Marcus Barnet's user avatar
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190 views

SD card breakout sometimes does not initialise (SPI connection - Teensy 3.2)

I have connected this Adafruit SD Breakout to a Teensy 3.2 over SPI. Because Teensy 3.2 is 3.3 V, I've connected the 3.3 V pin of the Teensy to the 3V pin of the SD breakout. See sketch below. I'm ...
daniel's user avatar
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Read SD card on ATMEGA328 from ESP826

I have a ATMEGA328 with ESP826 (like this http://arduinolearning.com/hardware/atmega328-esp8266-arduino-board.php) and can successfully send information from the ATMEGA328 to the ESP826 via serial. I ...
user1505631's user avatar
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Why is my SD shield making my Arduino not power on?

I wanted to use an SD shield on an Arduino Elegoo to make a typewriter (for saving files). I put the shield on the Arduino Elegoo, then connected an LCD screen, then tried to power on using USB to ...
dragonitebrian1024's user avatar
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1 answer
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Efficient way to save accelerometer data on sd card

I have analog accelerometer that transfer acceleration on 3 axis with frequency 5 kHz. I want to store that data in SD card for in txt file. My sketch is the following: void loop() { // Get raw ...
Kracozebr's user avatar
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SPI protocol with multiple devices

I need to write and read the measurements received by a sensor on an SD card. The card reading would be to display the data on a TFT screen. Specifically, I am using the 1.8-inch ST7735 screen. To use ...
Libegria's user avatar
2 votes
1 answer
159 views

How can I do web hosting having all the code of the site stored on an SD?

I am carrying out this project in which the Arduino acts as a web server and hosts a website in which I show the constantly updated temperature of a laboratory. The problem is running all this code in ...
Leo's user avatar
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1 answer
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Unexpected character added to char buffer array in serial monitor only when SD card initialized

I'm getting an unexpected extra character added to the serial monitor print line only when I initialize an SD card in the code. Normal The code below gives me this expected result in the serial ...
Dashiell Rose Bark-Huss's user avatar
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how can I delete contents of an SD card in arduino?

I have a datafile, datalog.txt I can open, read and write cool. What is the best way to delete all the file contents? Should I try rewriting the SD card file with NULL data? I have been reading the &...
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How can I play sound on Arduino with an SD card?(I have a problem with the sound)

I am working on a "personal assistant" with Arduino and I am having trouble playing sound from an SD card... I am using a shield called "Easy Shield UNO" by Simkeim, and it has an ...
Renier Jr.'s user avatar
1 vote
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Using a level converter to adjust the voltage levels

we are currently working on a device that needs us to connect an sd card reader to 2 Arduino’s ( Uno and zero) , however, we just found that it is not possible to do so without a level converter , may ...
Alya's user avatar
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Low Power, SD Card module and SCK

in order to minimise power consumption in a project using the Arduino Nano, I need to set pin D13 to HIGH after using it as SCK for transferring data to an SD card module (I use the SD.h module. I ...
Kilroy's user avatar
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SD Card Initialization Failed, cannot add inactive module

Just to preface I am not that great at coding or anything and I am currently building sensors off of Oregon State University's Smart Rock sensor code, so the code I am being used is not mine. I am ...
Bryce K's user avatar
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1 answer
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How to difference hardware reset and software reset?

I have an arduino code with an SD card where I save some data. When I load a new code, The SD must update with the new data that I put in the code, but if I reset the Arduino by the reset button, I ...
AlexSp3's user avatar
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Seeking to write a ton of information to an SD card as close to live as possible

So I've recently started a project where I am using an accelerometer, along with a SD card breakout board. I've been able to get information to write properly to the SD card with no issues whatsoever. ...
Colby Johnson's user avatar
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69 views

RTC shield with LCD and Keypad

I am having issues with a code that I have been modifying. I can change the TIME, and DATE from a keypad, and see the data on the serial monitor, but it is not recording on the SD Card. Anyone that ...
Merkhav's user avatar
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SD Card Library interferes with Adafruit

Im currently working on a datalogger that uses oled i2c displays and current sensors. Both of them uses adafruit libraries. To write the data, im using arduino's sd library, but somehow, the sd ...
3MP The Rook's user avatar
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206 views

Writing file from SD card to ethernet client stops sending after about 2980 characters, STM32f7 board

I am attempting to write a file found on an SD card to a connected Ethernet client. The file opens fine, and we have no problems writing to the client. For testing purposes I also write the lines read ...
JackOfAllTrades99's user avatar
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Get LFN from SFN with SDFat

I am trying to optimize the memory usage of my ESP8266 arduino sketch by using 8.3 SFN folder names internally, but LFN when needed for user output. Unfortunately when opening a folder by using the ...
Nitek's user avatar
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1 answer
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StoreProhibited error while trying to read file to PROGMEM

I'm trying to read a file from micro SD on an ESP32-cam board and upload to an FTP server, but when I try to read data from the opened file to an unsigned char, it gives me the following error: Guru ...
user2959923's user avatar
1 vote
1 answer
290 views

Substring: What is causing my output to be truncated?

I suspect that I might be using too many resources, because of the strings, but I am new to Arduino, so not sure where I am going wrong. Any help would be appreciated. What it should do when complete:...
E_Ja's user avatar
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Sending data to server

I have an SD card have a very big file (1M character). i try to load it into memory in terms of 4K character array ( The maximum I could do using Arduino Mega). but this take almost 250 call to the ...
Antoun's user avatar
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2 votes
2 answers
736 views

read first line from sd card and save the position for again reading from sd card

I am reading sd card .txt file, I want to read the first line then how to save the position of the pointer for the next line read?
Shrikant Nikam's user avatar
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1 answer
242 views

Arduino RTC SD Card problem

I am using a script on an Arduino to record BME280 data onto an SD card and to display it on a lcd display. To have a valid time stamp I am also using a DS3231 RTC module. I set the time succesfully ...
Kj Ell's user avatar
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How can we remove unused feature in Arduino's standard SD library so we can reduce the sketch size?

With the ReadWrite example in Arduino IDE, the sketch size is 10980 bytes (34%) of an Arduino UNO's storage. How can we reduce the sketch size? There isn't any kind of #define to turn on/off features ...
raspiduino's user avatar
1 vote
0 answers
53 views

SD card initialize and fails when date changed

i am making a project using Arduino Uno that display data on 7 seg display which stored in SD card as day by day. when i make power ON to device then SD card initialization done & data shows ...
Asif Ruikar's user avatar
1 vote
0 answers
1k views

ESP32 SD writes but doesn't append

I've got a microSD module adapter from the far east, and so far so good, and although it can create files using writeFile, it does not append messages. It returns true, i.e: message appended ...
The VaLo's user avatar
1 vote
0 answers
556 views

sdFat and Serial conflict?

I am using the sdFat library to manage an SD card with an ATmega1284p @ 8MHz internal clock. I have come across a strange issue in my system, and I created the smallest sketch that shows the problem: ...
NickG's user avatar
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2 votes
1 answer
584 views

seeeduino can-bus shield v2: can't read can bus and write on SD card

I'm using a seeeduino V4.0 and a CAN-BUS shield v2.0 with industrial grade SD card. I'm using the default library given by the wiki of seeed. I've simulate a can bus with two mcp2515. I can read it ...
Thanatheos's user avatar
3 votes
0 answers
112 views

Keypad - Speaker - Interference

I am trying to build a system, that plays specific audios (.wav files) from a SD-Card, according to the key combination that has been pressed. I am using: 4x4 Membrane 4 Ohm Speaker MicroSD Card ...
D_0's user avatar
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3 votes
2 answers
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Nextion Display not getting updated data

I am using an Arduino Mega to display the readings of 4 pots on a Nextion Display as well as store them on an SD Card with a time stamp. I keep getting: recvRetCommandFinished err on the serial ...
Niteesh Shanbog's user avatar
2 votes
1 answer
168 views

Returning to parent directory with the SD library

I have a File variable called dir and i'm building a simple file explorer for my device. Is there a way to get a reference to dir's parent directory?
none none's user avatar
  • 233
2 votes
1 answer
2k views

How to read an analog value on ESP32-CAM with the SD card reader enabled?

I use an ESP32-Cam module for a project for which I need both the SD card and the cam. According to this page, the only pins that are not in use by either the camera or the SD card reader are GPIO0, ...
Klaus Meier's user avatar
2 votes
1 answer
2k views

Any way to use DMA to transfer data to SD Card in ESP8266

I'm using ESP8266 at speed of 160 MHz to record ADC results into SD card, I need to do this at rate of 8 KHz. Means that i should save it on the SD Card or i'll run out of memory before 4 Sec passes. ...
A.R.S.D.'s user avatar
2 votes
1 answer
3k views

Record data to SD card with ATtiny85

An application of ATtiny with SD card is complicated due to missing of hardware SPI in attiny. The "ATmega" code for creating of a "SD file" is: #include <SPI.h> ...
Josef's user avatar
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0 answers
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Can I record us (microseconds) with AnalogBinLogger example in SdFat's library?

I am using the AnalogBinLogger from the SdFat example library. I am using it to record 8 analog channels at 5kHz! which is amazing (thank you SdFat). Is it possible to include a separate column to ...
Microk's user avatar
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1 answer
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File.read() always returns -1

I'm trying to print a txt file from an SD card to a SSD1306 using the u8x8 library. Here's the current code: #include <SD.h> #include <Arduino.h> #include <U8x8lib.h> #ifdef ...
none none's user avatar
  • 233
2 votes
2 answers
293 views

How safely write to SD or Eeprom on Arduino power off

I want to constantly store data to sd. But how I make sure data is not corrupted on moment of power off? I think I could add small capacitor on 5V and check when voltage drops, so I would stop data ...
Name's user avatar
  • 135
5 votes
0 answers
337 views

SPI between Master arduino and Slave arduino

How can I send the string from Slave SPI to Master SPI? I want to write code in Bare Metal. The problem which I am facing is I can't make out what will be my blocking function in Master SPI code when ...
Kunal's user avatar
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0 answers
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Write file to SD card using SDFat.h and ESP8266

I have simple problem with not simple solution. My workflow is: Read CID from SD card Send CID via Http to clodud Download specific text from cloud Write this text to file in same SD card All is ...
110mat110's user avatar
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