EnviroDIY

2019-11-14 at 1:14 PM #13336

Moderator

In asking about “your other thread” I meant this: https://www.envirodiy.org/topic/sd-card-recording-data-issue/

You need to make the modifications I mentioned above. You also need to pick a file name that is less than 8 characters, ie, “cond.txt” instead of conductivity.txt. I’d forgotten about the filename issue.

Your new code would be:

#include <Arduino.h>
#include <math.h>
#include <Wire.h>
#include <SD.h>
#include <SPI.h>

//Digital pin 12 is the MicroSD slave select pin on the Mayfly
#define SD_SS_PIN 12

//The data log file
#define FILE_NAME "Conductivity.txt"

//Data header (these lines get written to the beginning of a file when it’s created)
#define LOGGERNAME "Mayfly microSD Card Tester"
#define DATA_HEADER "Conductivity.txt"

int pin12 = 12;
File Conductivity1;
int volta;
float Division;

void setup()
{
    Serial.begin(9600);
    pinMode(SD_SS_PIN,OUTPUT);
    pinMode(22,OUTPUT);
    digitalWrite(22,HIGH);
    Division = 0.0048875;
    if (SD.begin(SD_SS_PIN))
    {
        Serial.println("SD card on");
    }
    else
    {
        Serial.println("SD card activation failed");
    }
}

void loop()
{
    volta = analogRead(A3);
    float voltage = (volta)*(Division);
    Conductivity1 = SD.open("Conducti.txt",FILE_WRITE);  // NOTE:  REMOVE "File" and choose a file name that is 8 characters or less
    Serial.println("Conductivity = ");
    Serial.println(voltage);
    Conductivity1.println(LOGGERNAME);
    Conductivity1.println("Conductivity = ");
    Conductivity1.println(voltage);
    Conductivity1.close();  // NOTE:  Must close file or data will not be saved
    delay (1000);
}

#include <Arduino.h>

#include <math.h>

#include <Wire.h>

#include <SD.h>

#include <SPI.h>

//Digital pin 12 is the MicroSD slave select pin on the Mayfly

#define SD_SS_PIN 12

//The data log file

#define FILE_NAME "Conductivity.txt"

//Data header (these lines get written to the beginning of a file when it’s created)

#define LOGGERNAME "Mayfly microSD Card Tester"

#define DATA_HEADER "Conductivity.txt"

int pin12 = 12;

File Conductivity1;

int volta;

float Division;

void setup()

{

Serial.begin(9600);

pinMode(SD_SS_PIN,OUTPUT);

pinMode(22,OUTPUT);

digitalWrite(22,HIGH);

Division = 0.0048875;

if (SD.begin(SD_SS_PIN))

{

Serial.println("SD card on");

}

else

{

Serial.println("SD card activation failed");

}

void loop()

{

volta = analogRead(A3);

float voltage = (volta)*(Division);

Conductivity1 = SD.open("Conducti.txt",FILE_WRITE); // NOTE: REMOVE "File" and choose a file name that is 8 characters or less

Serial.println("Conductivity = ");

Serial.println(voltage);

Conductivity1.println(LOGGERNAME);

Conductivity1.println("Conductivity = ");

Conductivity1.println(voltage);

Conductivity1.close(); // NOTE: Must close file or data will not be saved

delay (1000);

}

I still recommend you use SdFat instead of SD, which would allow you to use longer filenames and to set the file timestamps. Look at the example for that library: https://github.com/greiman/SdFat/blob/master/examples/ReadWrite/ReadWrite.ino