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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1answer
639 views

NFC 'dynamic' UID database

Hi SE (and Majenko in particular, if I'm lucky) - I have a setup with an SD module (on SPI) and an Elechouse PN532 NFC reader (on I2C). I would like to use a master tag to enter MASTER MODE [sic] to ...
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1answer
340 views

most effective ( progsize/speed ) SD card usage

I am making a project with several modules and libraries involved. I just tested the SD lib example, and got a binary at ~14KB - way too much. I'd like the SD bits to go below 8KB, since it's just ...
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1answer
493 views

How to structure data for HTTP upload

I'm building a GPS tracker using an arduino nano, Adafruit Ultimate GPS breakout, a SD card slot and a SIM800L module. So far everything works, the tracker uploads the data to a server as well as ...
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139 views

Cannot open file with underscores using the SD library

So I'm trying to create a new file that has underscores in its name. However, when I try this, no file is created. This works String fileName = "NMEA.txt"; mySensorData = SD.open(fileName.c_str(), ...
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1answer
4k views

Best way to read CSV from SD card and store values by date

I am starting a project in Arduino and I need to read data from an CSV stored in an SD card. The data is stored as the following: id, value, date What I want to do is read the file, filter by date ...
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2answers
174 views

SD test is taking long answer when it fails

I am working on an Arduino application that logs sensors values into SD files. It is essential that the SD is inserted and working when a test is started, thus I need to check the presence of the SD ...
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2answers
268 views

SD Card Info Unexpected

So I have just begun testing my Wireless SD Shield from Arduino with my Arduino UNO. Upon running my the basic CardInfo sketch, it uploads and displays data, but far more than expected. The SD Card is ...
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1answer
69 views

Why SD.exists() only looks for inside media/realroot on Intel's Galileo?

I'm following a tutorial which says SD.exists() only look for files inside media/realroot on Intel's Galileo board. I just confirmed this using SSH to create e remove files during a loop which was ...
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1answer
85 views

Can I connect a camera to an arduino mini?

I was wondering if it was possible to connect a camera like this onto an Arduino mini and have the Arduino save video and audio to a micro SD card.
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0answers
73 views

Program does not seem to be passing from setup to loop, or printing to SD card

I am trying to write code to test servo motors using an encoder. I create a file in the setup part, and then set 1500 microseconds to 0 for the encoder. However, if I try to print something to the SD ...
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1answer
64 views

Arduino Wireless SD Shield

Is it possible to use the Wireless SD shield without the wireless function, or XBEE Module? I do not need it to be wireless it simply was cheaper than any other I could find, so I was wondering if it ...
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2answers
2k views

Arduino: Sending SD CSV file online at specific time of the day

I intend to perform data logging from sensors and store it on SD card as CSV format. The data is related to weather and I would like to send it at the end of the day/ Any available codes how to deploy ...
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3answers
2k views

How to remove SD card safely

I’m constructing an arduino based sytem that uses a SD card and I’m looking for a way to safely remove the card from the system during operation. One way would probably be to turn of the arduino ...
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1answer
358 views

Can I do speech to text converting with arduino? [closed]

I am a beginner to arduino. I want to make such a robot that can convert my speech into text and save the texts in a .txt file in the SD card attached to my arduino. Can I do so? If it is possible ...
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1answer
1k views

How to import data from SDcard on Arduino to the computer using Arduino serial/COM port?

I have Arduino UNO with Adaruit wifi shield. I store some data on the sd card successfully and now I need to import that data on to the computer. I am sending some token, say "1", to the UART port of ...
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2answers
4k views

What is the best way to get more RAM for a sound buffer?

The problem: How to extend the memory for a sound buffer (intensively used) if: SD card library supports only one file open at a time (and I have one open already) EEPROM chips are able to stand ...
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1answer
702 views

Reading SD card with Sparkfun MP3 Shield

So I am using an Arduino Mega with the Sparkfun MP3 shield. And I can't seem to read the µSD card. It's formatted in FAT32 and it has a single .txt file on it. I always get this error: SD ...
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0answers
170 views

Get MP3 play length

I'm creating a project where music gets played that is the same length or slightly shorter than the given time (minutes:seconds). For this I have a Sparkfun MP3 shield, which also has a microSD slot. ...
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2answers
802 views

Can a 9V battery be used as a backup power supply (to Arduino Uno) while plugged directly into Vin and ground?

Sorry if this has been asked before, but I've read tons of threads and it seems the answer is only implied on a couple of occasions. I'm an electrical noob, but I understand that a 9v battery ...
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1answer
379 views

Why does getting list of files from SD card FAIL if not printing to Serial? (ESP8266) [closed]

I've got this piece of code for reading a list of files from root directory on SD card, which I run on ESP8266 chip (maybe it makes a difference): File dir = SD.open("/", O_RDONLY); int n = 0; ...
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0answers
868 views

Arduino Mega2560, Ethernet Shield & OV0706: “Camera not found”

I want to make a picture with the OV0706 that saves the picture to the SD card. I'm using the Arduino Mega2560, Ethernet Shield (with SD slot) and the OV0706 (this one: http://www.aliexpress.com/item/...
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VS1003 MP3 module performance(?) problem

I'm trying to play sound on Arduino Uno with a VS1003 module, using schematics and most of the code from this project and I have almost succeeded, but I've got (I think) a performance problem and I ...
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0answers
219 views

OV7670 non FIFO with AL440?

I am trying to build a low-cost Arduino-based camera image to SD card prototype and would like to know if it is feasible to connect a non-FIFO OV7670 camera to an AL440B video buffer to avoid the ...
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1answer
488 views

How to perform a data transfer to an external server

So I'm doing a project that involves getting sensor data from several sensors, and then sending them to an external server when a tragic occurs. But I've been having trouble figuring out how to send ...
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2answers
1k views

SD-Card-Module doesnt work with external power supply

Problem description I am trying to build a datalogger with an Arduino UNO. I have connected a SD card module to the Arduino. I have planned to catch the measurement data from the analog input pins. ...
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2answers
51 views

How to add SD card to store data [closed]

I'm new to Arduino and I was wondering how to add an SD card to Arduino so it can store more code and also store files such as text files. Is there such a shield, and if so, any suggestions?
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1answer
136 views

Compare the new sample in a high sampling rate datalogger

I am using sdFat library the analog bin logger example, Github: SdFat/SdFat/examples/AnalogBinLogger/ The program is working fine and every thing but the thing is, this high speed datalogger uses ...
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1answer
222 views

Why does analog sensor “hum” when plugged into common ground?

I have the ground for an SD card module, LED, and piezo sensor all plugged into the same ground rail. When doing this I get a low "hum" in the piezo readings where instead of reading ground voltage (0)...
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1answer
2k views

SD card initialization fails randomly

I have a SD card reader that is working fine exept that sometimes SD.begin fails for no apparent reason. To work around this issue I have put the SD.begin in a while loop and then I display the error ...
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2answers
4k views

Simple webpage serve with Arduino ethernet shield on SD card

I have been experiment with the arduino uno board from few days but can't seem to make it serve web page stored in SD card of ethernet shield. If I print the contents of the file to serial it works ...
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209 views

Connection between Matlab and Arduino

I'm trying to connect Maltab and Arduino by this code: arduino=serial('COM7','BaudRate',9600); fopen(arduino); But I get this message: Open failed: Port: COM7 is not available. No ports are ...
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0answers
108 views

Yún not detecting SD card

My Arduino Yún is not detecting my previously working SD card. The metal contacts are closed. There is no dmesg output after plugging in the SD. It does not detect a different SD. Any ideas for what'...
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1answer
66 views

Arduino uno not writing to file

I'd like the arduino to write to a file whenever an ajax call is made. The ajax works, but it doesn't write to the file. All other code inside the ajax handler does execute. void handle_ajax() { ...
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108 views

Is there a lean or modular SD library?

I'm using the SD library to perform two simple tasks. reading a configuration file writing a logfile I don't want to use subdirectories and can live with only two filenames. However, after linking ...
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1answer
318 views

Corrupted files generated by Arduino with SdFat library. How to avoid that?

I got: https://www.arduino.cc/en/Main/ArduinoBoardDuemilanove http://wiki.iteadstudio.com/Stackable_SD_Card_shield_V3.0 (set to 5V logic) with this sketch using SPI/SdFat+OneWire/DallasTemperature+...
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2answers
1k views

Why can I power an SD card reader from a digital pin?

I'm trying to understand the power requirements of an SD card. I have a cheap breakout board from eBay that includes built-in level shifters, so I can plug it in directly to my Arduino. I provide ...
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2answers
466 views

What happens when there's no space left on SD card?

I'm coding a data logger and I would like to know what happens if there are no bytes remaining to be written using SD library, ie, if the SD card is full of data. The logging would just stop or I ...
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1answer
576 views

SD print in script works in setup but not loop

I am a bit of a novice with the Arduino, and have had to learn a lot for my High Altitude balloon launch. I am getting ready to launch this, but for some reason, my datalogger, printing to an SD card, ...
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1answer
121 views

Arduino IDE Based Data Logger - Stops Running

I have created a data logger that writes to a MicroSD on a user defined interval. The data logger also has the ability to use an xBee unit to transmit the data received to a base station. This is ...
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4answers
1k views

Low power + Logging motion detection

Scenario: I would like to monitor my closet's door as I highly suspect a family member is opening and using my items without permission. To respect privacy and also because my closet is nowhere near a ...
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1answer
161 views

Connecting and Programming LinkSprite Camera to Arduino

I recently bought the LinkSprite color jpeg camera: https://www.sparkfun.com/products/12804 And the Arduino Wireless SD Shield: https://www.arduino.cc/en/Main/ArduinoWirelessShield I was wondering ...
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1answer
181 views

arduino SD card saving to file

Can anyone assist me with read/write to a SD shield. I am using a arduino along with a SD shield (POD uSD) I am using a ultrasonic sensor to measure a distance, it has a safety factor in it. It also ...
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2answers
6k views

How to use a microSD card reader with SCK instead of CLK?

I've bought this microSD reader/writer: http://www.ebay.com/itm/131132034753 I've found only one tutorial, where the pins are similar to my pins, but in the example there is a CLK instead of SCK: ...
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1answer
2k views

Using TMRpcm library, the audio does not play

I'm using the https://github.com/TMRh20/TMRpcm/wiki library to play wav files from an SD card to a speaker I have attached to my Arduino. I have run separate tests/programs that ensures: my speaker ...
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0answers
362 views

Adding more storage to microprocessor 3.3v trinket

Project: I'm a software guy trying to learn more about hardware so I've decided to do a project that uses a small micro controller which plays short sound clips over a .5w speaker. The ...
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4answers
13k views

SD card fails to initialize

I know this question has be asked before on this site. However it was never really answered. I have an Arduino Uno. I am trying to get it to read a 2 GB SDHC Micro SD card. The problem is, the SD card ...
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1answer
5k views

using seek() in Arduino to go to the end of a variable-sized file

Anyone know how to use the seek() function of Arduino SD Library to position pointer at the end of a file? If programming in Windows do something like: void fileInsert(char *file, void *data, size_t ...
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1answer
422 views

VC0706 card failed, or not present

I'm trying to follow this tutorial here: https://learn.adafruit.com/ttl-serial-camera/using-the-camera Here's what my serial log is printing-- I've added a few commands for logging: Arduino ...
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2answers
161 views

SD card and Arduino

Good day! I need help regarding the use of SD card on Arduino. I need to store some recorded music and I want the Arduino to process it. Do I need to add some module? And circuitry? Libraries and code....
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2answers
9k views

arduino creates strange files in SD card

I'm new to Arduino and electronics. I want to make a project including SD data-logger, but I had a problem. I would appreciate if someone show me where I made a mistake. Firstly, circuit was set up ...

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