Trouble logging to a micro SD card

[diyaerospace]

Hi,
I am working on a way to log data from a pressure sensor onto a micro SD card but it is proving difficult. My problem is that after I run the sketch and open up the micro SD card the file is there but there is no data on the file.
I have been able to identify the micro SD card using the "Cardinfo" Arduino library. I have been able to log example data to it using the "Datalogger" Arduino library. And I have tried printing out the values that would be logged and the results are perfect proving that the sensor works. I am clueless as to what is going on and need help.
Thanks for your time.

I am using an Adafruit Micro SD card slot

MicroSD card breakout board+

Here is my code

#include <Wire.h>
#include <LPS.h>
#include <SPI.h>
#include <SD.h>
float altitude_difference = 0;
const int chipSelect = 10;

float TimeKeeper=0;
float alt_present = 0;
float  startingPressure=0;
float Velocity = 0;
float Altitude=0;
float Altitude1 = 0;
  int launch = 0;
  int trigger=0;
float Apogee=1;
float Maxvel = 0;

LPS ps;

void setup()
{
  Serial.begin(9600);
  Wire.begin();

  if (!ps.init())
  {
    Serial.println("Failed to autodetect pressure sensor!");
    while (1);
  }

pinMode(10, OUTPUT);
SD.begin(chipSelect);
  ps.enableDefault();
   float pressure = ps.readPressureMillibars();
  float altitude = ps.pressureToAltitudeMeters(pressure);
 Altitude1 = altitude;
 

}

void loop()
{

  File flight1 = SD.open("Fli.txt", FILE_WRITE);
  
  float pressure = ps.readPressureMillibars();
  float altitude = ps.pressureToAltitudeMeters(pressure);
 Altitude= altitude - Altitude1;
 float alt_past = altitude;
float Velocity_past = Velocity;
 

  {
    delay(30);
    float pressure = ps.readPressureMillibars();
  float altitude = ps.pressureToAltitudeMeters(pressure);
  float alt_present = altitude;
  
float altitude_difference= alt_present - alt_past;
 

Velocity = altitude_difference+ 0.05 /0.094;
float Velocity_past = Velocity;

delay(30);

 


  }
  

  if (flight1) {
    flight1.println(Altitude);
  if (launch <= 1) {
 if(Altitude>1.5) {  Serial.print("p: ");

  
 flight1.print(pressure);
  flight1.print(" mbar\ta: ");
  flight1.print(altitude);
  flight1.print(" m\tt: ");
 // Serial.print( temp.temperature );
 flight1.print(" deg C");
  flight1.print(Altitude);
  flight1.print("      ");

  flight1.println(Velocity);
 
  launch = 1;

 }
  }

pressure = ps.readPressureMillibars();
 altitude = ps.pressureToAltitudeMeters(pressure);
  alt_present = altitude;

  altitude_difference= alt_present - alt_past;
 

Velocity = altitude_difference + 0.05/0.094;
 float Velocity_present = Velocity;

if (Maxvel <= 0) {
  if (Velocity_past > Velocity_present) {
float    Max_velocity = Velocity;
flight1.println(Max_velocity);
 Maxvel = 1;
  }
}
  

 
  
   delay(30); 




  
  //unsigned long currentTime = millis();
  
 // if (currentTime - previousTime >= eventInterval) {
    //previousTime = currentTime;
 if (launch>=1) {
 if (Apogee <= 1) {
  if (Velocity < 1.5) {
 launch = 2;
  
flight1.println ("Apogee");

//Serial.print ("    ");
//Serial.print (Altitude);

  }
 }
 }
 
if(launch>=2) {
  if ( Velocity <= -1) {
flight1.print("      ");
flight1.print ("descent");
flight1.print(pressure);
  flight1.print(" mbar\ta: ");
  flight1.print(altitude);
  flight1.print(" m\tt: ");
 // Serial.print( temp.temperature );
  flight1.print(" deg C");
  flight1.print(Altitude);
  flight1.print("      ");

  flight1.println(Velocity);

Apogee = 2;
flight1.close();
  }
}
 }
}

[Paul_KD7HB]

Without even looking at your code, I can tell that you do not close the file before ending the program execution. Search the forum for the same problem with using an SD card.

Paul

[diyaerospace]

Thanks for the reply,
I closed the file at the end of the sketch is this enough?

@diyaerospace

flight1.close();

[mancera1979]

Your sketch indentation makes it really hard to read.

Apparently the file is closed only when a series of conditions are met.

Exactly when do you close the file? Does closing the file depend on a condition, like velocity<=-1, or it is always closed?

[Idahowalker]

I use append.

void fSendToFile( void * parameter )
{
  if (!SD.begin())
  {
    log_i("Card Mount Failed");
  } else {
    xSemaphoreGive( sema_SD );
  }
  String toFile = "";
  toFile.reserve( toFileSize );
  for (;;)
  {
    if ( xQueueReceive(Q_toFIle, &toFile, portMAX_DELAY) == pdTRUE )
    {
      //log_i( "%s %d\n", toFile.c_str(), toFile.length() );
      xSemaphoreTake( sema_SD, portMAX_DELAY );
      appendFile(SD, "/data.txt", toFile.c_str() + '\n');
      xSemaphoreGive( sema_SD );
      toFile = "";
    }
    //log_i( " high watermark %d",  uxTaskGetStackHighWaterMark( NULL ) );
  }
  vTaskDelete( NULL );
}
////

////
void writeFile(fs::FS &fs, const char * path, const char * message) {
  File file = fs.open(path, FILE_WRITE);
  if (!file) {
    log_i("Failed to open file for writing");
    return;
  }
  if (file.print(message)) {
    log_i("File written");
  } else {
    log_i("Write failed");
  }
}
////
void appendFile(fs::FS &fs, const char * path, const char * message) {
  //log_i("Appending to file: %s\n", path);
  File file = fs.open(path, FILE_APPEND);
  if (!file)
  {
    log_i("Failed to open file for appending");
    return;
  } else {
    file.print(message);
    file.close();
  }
}
////
void renameFile(fs::FS &fs, const char * path1, const char * path2) {
  log_i("Renaming file %s to %s\n", path1, path2);
  if (fs.rename(path1, path2)) {
    log_i("File renamed");
  } else {
    log_i("Rename failed");
  }
}
////
//void renameFile(fs::FS &fs, const char * path1, const char * path2) {
//  log_i("Renaming file %s to %s\n", path1, path2);
//  if (fs.rename(path1, path2)) {
//    log_i("File renamed");
//  } else {
//    log_i("Rename failed");
//  }
//}
////
void deleteFile(fs::FS &fs, const char * path) {
  log_i("Deleting file: %s\n", path);
  if (fs.remove(path)) {
    log_i("File deleted");
  } else {
    log_i("Delete failed");
  }
}