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.
363
questions
2
votes
1
answer
80
views
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' '...
- 31
0
votes
2
answers
318
views
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 ...
- 11
1
vote
0
answers
57
views
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 ...
- 11
-3
votes
2
answers
43
views
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 ...
- 1
2
votes
2
answers
528
views
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 ...
- 71
1
vote
0
answers
37
views
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 ...
- 171
2
votes
0
answers
164
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 ...
- 185
-1
votes
2
answers
210
views
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 ...
- 121
1
vote
0
answers
59
views
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 ...
1
vote
1
answer
236
views
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 ...
- 111
1
vote
0
answers
208
views
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 ...
- 29
2
votes
1
answer
130
views
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 ...
- 23
1
vote
1
answer
223
views
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 ...
0
votes
1
answer
1k
views
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 &...
- 882
1
vote
1
answer
885
views
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 ...
- 99
1
vote
0
answers
108
views
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 ...
- 11
2
votes
0
answers
180
views
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 ...
- 49
2
votes
0
answers
65
views
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 ...
- 21
2
votes
1
answer
326
views
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 ...
- 203
0
votes
1
answer
469
views
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. ...
1
vote
0
answers
66
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 ...
- 31
1
vote
0
answers
88
views
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 ...
- 41
2
votes
0
answers
196
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 ...
1
vote
0
answers
95
views
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 ...
- 123
1
vote
1
answer
323
views
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 ...
- 61
1
vote
1
answer
246
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:...
- 21
1
vote
0
answers
60
views
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 ...
- 11
2
votes
2
answers
639
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?
0
votes
1
answer
224
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 ...
- 11
1
vote
0
answers
247
views
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 ...
- 111
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 ...
- 11
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 ...
- 41
1
vote
0
answers
504
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: ...
- 163
2
votes
1
answer
471
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 ...
- 63
3
votes
0
answers
109
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 ...
- 31
3
votes
2
answers
1k
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 them on an SD Card with a time stamp. I keep getting:
recvRetCommandFinished err
on the serial ...
2
votes
1
answer
151
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?
- 233
2
votes
1
answer
1k
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, ...
- 23
2
votes
1
answer
1k
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.
...
- 41
2
votes
1
answer
2k
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> ...
- 51
1
vote
0
answers
163
views
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 ...
- 115
0
votes
1
answer
72
views
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 ...
- 233
2
votes
2
answers
267
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 ...
- 135
4
votes
1
answer
325
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 ...
- 71
1
vote
0
answers
2k
views
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 ...
- 149
3
votes
2
answers
244
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 ...
- 155
0
votes
1
answer
596
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 ...
- 225
1
vote
1
answer
620
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 ...
- 33
1
vote
1
answer
207
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....
- 111
0
votes
1
answer
786
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)....
- 101