Questions tagged [sd]
The sd tag has no usage guidance.
42
questions
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0answers
14 views
Microsd card PCB circuit designing [migrated]
I am trying to develop a microSD card module myself. My microSD card module is working at 3.3V and my microcontroller is operating at 1.8V. I have therefore used TXB0104 voltage level shifter to ...
0
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0answers
23 views
LCD on top of SD datalogger flickers help!
I have a problem with my 16,2 with buttons lcd shield.(LCD Keypad Shield). It is connected on top of an SD dataloger. I came to the conclusion that every time the sd shield logs data and completes the ...
1
vote
2answers
47 views
Arduino SD Card open file modes append / overwrite
Running Arduine IDE SD DataLogger Example, my data gets appended to a txt file.
File dataFile = SD.open("datalog.txt", FILE_WRITE);
if (dataFile) {
dataFile.println(dataString);
dataFile.close();
...
0
votes
1answer
61 views
Fast data logging
I want to store noise data (basically from A0) from an Arduino Uno to an SD card with faster writing speed, preferably by using 512 data together and the write it at once. What should be the code?
0
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0answers
163 views
DFPlayer for Writing to SD Card
Can you use the DFPlayer to write to the SD card?
Link for DFPlayer: https://www.dfrobot.com/wiki/index.php/DFPlayer_Mini_SKU:DFR0299
Here's the goal of my project. I have a button that, when pressed,...
0
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0answers
23 views
TimerOne and Saving Data to SD Card
I'm using TimerOne.h for collecting sensor (two photocells) data with a frequency of 100 ms and saving the data to a SD card. The file only seems to save data when the computer is connected to the ...
0
votes
1answer
65 views
Where are the implementations of the SdFat BlockDriver methods?
This is most probably more of a C++ question than an Arduino question; but since this is an Arduino library, I am asking here.
I am using the SdFat library for my project. The library defines a ...
0
votes
1answer
65 views
Trouble with reading Bitmaps from SD-Card
I'm having problems with reading a bitmap file with the SD library.
I wrote a small header that reads uncompressed 24-bit bitmap files. It works fine when I try it on Windows 10 MingW with fread() ...
-1
votes
1answer
175 views
Attempting to read random string from SD card
I was wondering if anyone knew how to read in a random string from a file named "PhraseList.csv" or "PhraseList.xlsx" (whatever is easier)? There is a list of 10k.
#include <SD.h>
#include <...
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0answers
27 views
SD card module not responding [duplicate]
I am trying to read an SD card info by Arduino and an SD card module. But the SD card is not responding. I connected the wires carefully several times but it is not working.
I am using this module :
...
0
votes
2answers
277 views
arduino usb host shield and sd card [closed]
when I use the sd card on the mega or the arduino uno it works. Everything is fine. However, when I use it in combination with the USB shield host it doesn't work. I know the usb shield host works ...
0
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2answers
299 views
How does one **get** attributes for SD files?
To be able to set the date and time of the files on my SD card I followed this answer: https://arduino.stackexchange.com/a/39127/49678
Now I am wondering How do I read the values out in the ...
0
votes
3answers
474 views
Use 5V SD-Adapter on 3.3V System
I want to use a Catalex Micro SD Card Adapter in Combination with my Arduino MKR GSM 1400. The problem is, that the Arduino uses 3.3V to operate but the SD Adapter needs 5V (or at least 4.5V) to ...
0
votes
1answer
237 views
PMS5003 Serial Output Data to SD Issues
I'm trying to save the output of an air quality sensor to a SD card, but I'm having a few issues.
The sensor I'm using is a Plantower PMS5003 which puts out its data via serial. I've heavily tweaked ...
0
votes
1answer
41 views
Datalogger with interruputs
I'm trying to do a data logger. Writes into SD card has to stop when millis()=1000. Maybe I have a problem between millis() and my interrupt, because datalogger doesn't stop after millis()=1000. I'm ...
0
votes
1answer
118 views
Arduino UNO And SD Card Custom csPin
I've connected SD card module to Arduino UNO. I want to use PIN 10 for PWM DC motor control and because of that, I've connected CS pin directly to another pin (A3).
SD card is working properly, but ...
2
votes
1answer
186 views
Long freezes at the beginning of sd card transfer
I am creating an accelerometer data logger that writes data to sd card. After some sort of "warm-up" everything works perfectly for at least ~15 minutes (which is what I have tested so far).
However, ...
0
votes
1answer
3k views
Saving a .txt file to SD Card and Reading each content data to txt file then save it to a variable
I am new to arduino I am trying to create an arduino project that Saving a .txt file to SD Card and Reading the txt file then save it to a variable data type "Long" named 'savednum'. I had ...
0
votes
2answers
248 views
Adding music to loop
Im newbie. I just wanted to ask how can i put my tmrpcm.play into loop. Im trying to put it in a loop but the problem is it didn't play. I also try adding a method and call the method into the loop ...
1
vote
1answer
65 views
Strange behavior on bitwise operation
i am trying to write a simple program that writes the outputs of an accelerometer (which comes down to 3 analog inputs) onto an SD-Card.
I got the hole thing working fine (sending the values as ...
0
votes
1answer
1k views
Delete line from text file
In order to make an algorithm work, I'd like to delete the first line of a text file. I'm having a hard time finding an example for that though. I was thinking that there should be the possibility to ...
1
vote
0answers
52 views
SD card doesn't work properly
I have this SD-card module. I have formatted the SD with this tool. My problem is that the Arduino Uno can't initialize the SD. I tried with this script:
// include the SD library:
#include <SPI.h&...
0
votes
3answers
3k views
Is there a way to play .mp3 files from an SD card on Arduino?
Is there a way to have mp3 files on an SD card in the SD card shield for the Arduino and play an mp3 file on that SD card with a buzzer?
If possible also with something like:
playmp3(thismp3.mp3);
...
0
votes
1answer
533 views
Problem with SPI comms using NodeMCU v 3, Nano and SD
Recently I bought a NodeMCU 8266 v 3 (Lolin) and it works fine. I set up a Catalex SD card module (with a built-in 5-3.3V regulator) and all was good. Then I set the Lolin with an Arduino Uno and or a ...
0
votes
2answers
792 views
Rfid reader and SD card shield won't work together
I recently encountered a problem that's been bugging me for days. I want to make a project using a RFID reader and log data on an SD card with an Arduino Nano, but apparently no matter what I do, I ...
1
vote
2answers
967 views
Problem opening multiple text files simultaneously/in-order using <SD.h>
I am looking to log analog sensor data using 3 pins, A1, A2, A3. My project requires continuous mapping of data, and hence an SD card shield was necessary. However, I need to log the incoming data ...
1
vote
0answers
416 views
Error while creating file on sd card
I want to create a file and read it form sd card by arduino. I have used sd card module. I have used this following code. In serial monitor it says "SD card is ready to use." But it can't read or ...
0
votes
1answer
38 views
Open Parent Class as Child Class (SD Fat Library)
I'm currently using the SDFat library and am passing a global FatFile
I if have a function that requires an SdFile type and I know that a given instance of FatFile is a valid SdFile what is the best ...
4
votes
2answers
466 views
How can I work with two devices that use the SPI protocol?
I'm working with a project in which I need to use an SD card module and an RFID antenna simultaneously. The devices that I'm using are the MFRC522 and the CATALEX SD Card Adapter. Both have SPI ...
0
votes
1answer
1k views
read CID of SD card with SD.h library
I would like to be able to read the serial numbers of SD cards using the SD.h library. Only reading the values is enough, I am not looking to modify the CID.
This should be possible but I do not have ...
0
votes
1answer
155 views
Connect Arduino to an external microSD card reader [closed]
I have a camera with a microSd card reader that is the only output type.
I want to read the microSd when the camera makes a photo.
How can I read it with an Arduino?
Duplicating the reader connections ...
0
votes
1answer
1k views
Write char array containing new line to SD card
How do I a buffer (char array) containing new line character to SD card using SdFat?
I tried:
File myFile = SD.open("test.txt", FILE_WRITE)
myFile.write(buffer, BUFLEN)
but I get this instead:
...
1
vote
1answer
538 views
Using the SD library with the ESP8266 DevKit
The situation is as follows, I've connected a SPI TFT screen to the ESP8266 DevKit, set my own MISO,MOSI, CD, SCK pins and it works fine, wanted to do the same for using the SD card reader, but then I ...
2
votes
2answers
2k views
How does one set attributes for SD files?
How does one set file attributes, e.g., creation date, for a file being created on an SD?
0
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1answer
457 views
How do I load an image using fopen()?
I am trying to write a program that fopen()s an image so I can use it later.
I've wired my SD card adapter exactly the way shown here:
[![enter image description here][1]][1]
And I'm using the ...
4
votes
2answers
3k views
Data logging speed with arduino
I am trying to make some data logging conserining physiological data coming from a bitalino.
My problem is that I would like to collect samples at something like 1 kHz, that is the rate that the ...
2
votes
1answer
549 views
LED strip and SD card
My problem is simple yet extremely problematic. For some reason, I cannot interact with an SD card and a LED strip at the same time with my arduino. After hours of testing multiple scripts, I am 99.99%...
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vote
0answers
424 views
Arduino Audio Recorder - Speed Correct but Wrong Pitch
I'm working on an audio recorder project on an Adafruit Adalogger with SAMD21 ARM-based processor using the Arduino IDE. The desired sampling frequency is 10 kHz, 12-bit resolution with an analog ...
2
votes
1answer
480 views
SD.begin() causes SD card to pull 20mA in idle mode. Seem high?
I'm working on a project that uses an Atmega328p as the primary controller. I am using the Arduino libraries for programming.
I currently have an SD card in the project. I've done quite a bit of ...
0
votes
0answers
72 views
Realistic to create a local variable as the SD buffer?
My intention is to read a file (of max. 128 KB) from an SD card and store it in (external SRAM). I will use an Arduino Mega which has 8 KB of internal SRAM but even 8 KB is not really much for some ...
1
vote
1answer
2k views
Global memory reduction when using SPI/SD
I want to use an SD card and when including the library both SPI.h and SD.h are included. Also later I want to use an external SRAM chip (probably using SPI.h as well). However, without the SRAM chip ...
0
votes
2answers
455 views
How fast is a SD page read from a file?
For a project I would like to do, I asked a question about whether to use SD or EEPROM (see Question
I checked how much memory I would need without any restrictions which is like 2 MB (or more) so a ...
