SD Bee not logging

blockly
#1

I followed the example here https://en.docs.sensebox.de/blockly/blockly-sd/ to log CO2 data to an SD Bee. However, I don’t get any data. The SD card is a 64GB FAT formatted.

code is here

#include <SPI.h>
#include <SD.h>
#include "SparkFun_SCD30_Arduino_Library.h"
#include "SenseBoxMCU.h"

int co2;

File dataFiledata;
SCD30 airSensor;

void setup() {
  SD.begin(28);
  dataFiledata = SD.open("data.txt", FILE_WRITE);
dataFiledata.close();

   Wire.begin();
  if (airSensor.begin() == false)
  {
    while (1)
      ;
  }

  co2 = (int)(airSensor.getCO2());

}

void loop() {

dataFiledata = SD.open("data.txt", FILE_WRITE);
    dataFiledata.println(co2);
  dataFiledata.close();

}
#2

Hi Blaise,
you read the the sensor only once in the „setup“ function. In loop you write always this value into the data file. So move the line
co2 = (int)(airSensor.getCO2());
into the loop function and you should get new and different values. You may use delay (https://www.arduino.cc/reference/en/language/functions/time/delay/) to reduce the amount of written sensor data to the SD Card
Bernd

#3

Thanks for your reply Bernd.

However I have set it up in this way

image

but still not getting any file on my SD card.

#4

Hi @blaise,

is the SD-Modul connected to the XBEE2 Port? Could you try to use a different SD-Card? Large SD Cards greater than 32GB could be the problem.

#5

On another post I sent a picture. Yes it is the XBEE2 port.

Where does it say cards over 32GB can’t be used? Over the years I have actually not bought anything less than 64 as there is almost no cost difference between them and smaller ones. My raspberry pi 1 handles a 64GB card fine.

Can you confirm what the maximum size is. Again this is surely something to mention in the shop?

#6

For the code generator in blockly we are using the standard Arduino SD Library which supports SD Cards up to 32GB.

You can use other Libraries like SdFat (https://github.com/greiman/SdFat) which also support propper formatted larger SD-Cards.

So its not really a hardware related problem more related which software one is using and the main purpose for blockly is the use with the senseBox:edu which includes only a 16GB SD-Card, so we didn’t ran into this issue before.

I’ll check if I can easily migrate the code to the SdFat library in blockly, but it might take some time due to other work to do.