SD Data Recording – EnviroDIY

This topic has 5 replies, 2 voices, and was last updated 2019-11-14 at 2:17 PM by Sara Damiano.

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2019-11-04 at 5:14 PM #13303
Gera
Participant
Hi all,

I am trying to log data from a conductivity sensor to the SD card, for some reason it is not working. here is my code (I try to use code snippet but I could not make it look like how it suppose to be, I will try again when I am not too busy):

#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);
File Conductivity1 = SD.open(“Conductivity.txt”,FILE_WRITE);
Serial.println(“Conductivity = “);
Serial.println(voltage);
Conductivity1.println(LOGGERNAME);
Conductivity1.println(“Conductivity = “);
Conductivity1.println(voltage);
delay (1000);

Please may everybody tell me what I am doing wrong, i would appreciate.
2019-11-08 at 6:03 PM #13315
Sara Damiano
Moderator
I think

C++

File Conductivity1 = SD.open(“Conductivity.txt”,FILE_WRITE);

1

File Conductivity1 = SD.open(“Conductivity.txt”,FILE_WRITE);

should be

C++

Conductivity1 = SD.open(“Conductivity.txt”,FILE_WRITE);

1

Conductivity1 = SD.open(“Conductivity.txt”,FILE_WRITE);

You also should have a

C++

Conductivity1.close()

1

Conductivity1.close()

before the last delay.

Are you using a Mayfly? Are you using the built-in microSD card slot or the vertical adapter? What output do you get?

Did you ever get your program in your earlier thread to write to the SD card?
2019-11-14 at 9:56 AM #13335
Gera
Participant
Yes, I am using Mayfly. I am using the built-in microSD card slot. My output I get the values in the serial monitor but nothings gets written into the SD card. The last question is kind of confusing to me, but what I am thinking is that you are asking me if I ever put the code of the SD card somewhere else in this code then yeah, but I still get nothing written into the card.

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

Sara Damiano

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

2019-11-14 at 1:56 PM #13337
Gera
Participant
Oh… Well I decided to leave that thread for later because I wanted to focus on getting something recorded on the SD card. I see now the mistakes I did. I would change to SdFat if it makes things better, I was trying to get something to work first. The code is now working for me. Thank you very much! The Filename issue was the only thing that I did not knew.
2019-11-14 at 2:17 PM #13339
Sara Damiano
Moderator
I’d completely forgotten about the filename issue, too. It’s definitely a “gotcha” that’s hard to catch.

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