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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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 ...
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2 votes
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How can I do web hosting having all the code of the site stored in a sd?

I am carrying out this project in which the arduino acts as 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 ...
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My Arduino Datalogging Shield fails to read the SD card

I used a couple of codes , including the cardinfo and datalogging examples from the IDE itself but no matter what code I use the shield fails to read my SD card, I also disconnected anything else just ...
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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 ...
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ESP8266 Pulling Credentials from SD makes esp unable to connect

I'm trying to set up a wifi SD server and i want to put the wifi credentials in a config.txt file on the sd. The entire code works fine. when i dont use the sd credentials but when i do i run into ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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. ...
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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 ...
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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 ...
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2 votes
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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 ...
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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 ...
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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 ...
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1 answer
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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:...
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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 ...
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2 votes
2 answers
180 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?
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0 votes
1 answer
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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 ...
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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 ...
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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 ...
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406 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 ...
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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: ...
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1 answer
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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 ...
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3 votes
0 answers
74 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 ...
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3 votes
2 answers
816 views

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 it in an SD Card with the time stamp. I keep getting: recvRetCommandFinished err on the serial ...
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2 votes
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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?
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2 votes
1 answer
810 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, ...
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2 votes
1 answer
570 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. ...
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1 vote
1 answer
928 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> ...
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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 ...
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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 ...
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2 votes
2 answers
146 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 ...
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4 votes
1 answer
163 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 ...
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1 vote
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 ...
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3 votes
2 answers
146 views

Writing a 1Mb bitmap to an SDcard with only 96kB RAM

My goal is to have an Arduino Due (96 KB RAM) write a +-1MB bitmap to an SD card. I have an array of a several coordinates on my Arduino Due and I would like to generate the bitmap where all the ...
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0 votes
1 answer
256 views

2 SPI Slaves with 2 different SPI modes on one Arduino Mega

I am working on a project where I read 8 MAX31856 thermocouple sensors using the Adafruit Library. This works just fine and prints the read outs to serial. I want to also save the readings to a ...
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1 vote
1 answer
268 views

DFplayer, Play sound when pin is high

I have a code here, from DFmini player. I have a tactile switch. when I press it on and release it will play a sound. My question is that when I press the tactile but not release it so I want it still ...
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1 vote
1 answer
113 views

Wave file will not play with Teensy 3.5

I am attempting to play a wav file from an SD card using a Teensy 3.5. I am using this buzzer and I have the following code currently: #include <Audio.h> #include <Wire.h> #include <SPI....
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0 votes
1 answer
371 views

Connect one SD card to two devices

I have a system where an Arduino controls a DSLR camera for environmental monitoring. The Arduino can power on/off the camera and control the shutter (through the standard plug for a external shutter)....
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1 vote
0 answers
50 views

Arduino SD card module failure

I am recieving SD card failuer and I did everything I could. I use the correct SPI pins; CS > 10 MOSI > 11 MISO > 12 SCK > 13 VCC > 5v GND > GND I did format my SD card to FAT32 I ...
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How to separate in columns the data contained in a barcode

I have the following code, which allows me by scanning a typical 128 barcode to write this code in SD card under the Header "FA" as well as the time and date of scanner under the Header &...
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1 vote
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sent commends by bluetooth to sd card as one line of string

void loop() { if (Bluetooth.available() > 0) { dataIn = Bluetooth.readString(); //the problem is here while(dataIn !=""){ dataSd += dataIn; ...
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1 vote
1 answer
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Problem with STM32 and SDFat lib on other SPI port

I am using STM32F103C8 and I am triing to compile a code with SDFat library. The problem is I need to use the second channel of the SPI1 (pins PB5,PB4,PB3, PA15): I found out that is possible to use ...
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0 votes
1 answer
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Connect two SD cards to one Arduino board and copy from one to another

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 ...
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1 vote
0 answers
61 views

Is there a way for an Arduino to flash another one without a computer?

I am going to create a game console. The games will be in an SD card and an Arduino (or an Atmega chip) will read a hex file's contents to RAM and will flash it to another one. Something like this but ...
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1 vote
1 answer
219 views

Connecting microSD reader and e-paper display to Nano at the same time?

Pretty much as the question states, I'm wondering if it's possible to connect (this: https://www.waveshare.com/7.5inch-HD-e-Paper-HAT.htm ) 7.5" e-paper display that has raspberry pi HAT and an ...
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1 vote
0 answers
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Unable to initialize SD card [duplicate]

I am not able to initialize the SD card. Can't find figure out what the issue is. It fails at the condition if (!SD.begin(D8)) { Serial.println("initialization failed!"); return; } I am using D1 ...
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