Questions tagged [sd]
64 questions
3
votes
1 answer
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, during the first few seconds there are some…
oliver
- 175
- 7
3
votes
2 answers
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?
KC Tucker
- 396
- 1
- 6
- 18
1
vote
2 answers
Can I read from a memory card with three pins?
I have a project where I have three pins to use and I just realized it would be better to use a memory card than replacing the code each time.
I'm building a Arduino with a push button. Press the button and it sends keystrokes to the connected…
Andreas
- 146
- 7
1
vote
0 answers
Getting wrong value from sd card
I stored "28328630" in sd card but at output i getting wrong value.
on serial "5566" getting this value.
#include "HX711.h"
#include
#include
#include
#include
int data = 0;
int curr_rate = 0; //…
Ravinder
- 11
- 2
0
votes
1 answer
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 working with Arduino Mega.
#include…
0
votes
1 answer
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:
0000 0000 0000 0000 0000 0000 0000 3337
3837 3838 3937…
Dzung Nguyen
- 417
- 1
- 7
- 17
0
votes
1 answer
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 following code to fopen():
FILE *streamIn;
streamIn =…
Assafi Cohen-Arazi
- 173
- 1
- 12
-1
votes
1 answer
SD card reader and lcd display
I have sd card reader and lcd display. I want to display bitmap with u8g2 library. My bitmap looks like:
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0x3f, 0x00, 0x00, 0x00, 0x80, 0xff, 0xff, 0xff, 0xff, 0xff,…
jasiekk
- 1