Trying to figure out the code to this

Development Boards Arduino
1

Hi All,

I’ve got a sensor a Lidar Lite unit that I want to send the data to a Spark Fun Open Log. Below is what I’ve got for my code, will it create and store the data recorded / stored?

#include <SPI.h>
#include <SD.h>

void setup() {

while (!Serial){
    ; // wait for serial port to connect. Needed for native USB port only.
  }
}
  Serial.print("initializing SD Card..."); 

  //See if the card is present and can be intialized.
  if(!SD.begin(chipSelect)){
  Serial.println("Card failed, or not present");
    //don't do anything more.
    return;
  }
  Serial.println("card initialized");
}

void loop() {
// make a string for assembling the data to log:
  String dataString = "";

  // read three sensors and append to the string:
  for (int analogPin = 0; analogPin < 3; analogPin++) {
    int sensor = analogRead(analogPin);
    dataString += String(sensor);
    if (analogPin < 2) {
      dataString += ",";
    }
  }

  // open the file. note that only one file can be open at a time,
  // so you have to close this one before opening another.
  File dataFile = SD.open("datalog.txt", FILE_WRITE);

  // if the file is available, write to it:
  if (dataFile) {
    dataFile.println(dataString);
    dataFile.close();
    // print to the serial port too:
    Serial.println(dataString);
  }
  // if the file isn't open, pop up an error:
  else {
    Serial.println("error opening datalog.txt");
}

If this doesn’t work, what would?

2

No, that won’t work. At minimum, all you need to do is connect OpenLog to RX & TX and print to serial (which means that you cannot simultaneously use the serial monitor).

You should carefully read the guide to OpenLog: https://github.com/sparkfun/OpenLog/wiki

Finally, don’t use Strings. They create memory and reliability problems on Arduino.

3

jremington:
No, that won’t work. At minimum, all you need to do is connect OpenLog to RX & TX and print to serial (which means that you cannot simultaneously use the serial monitor).

You should carefully read the guide to OpenLog: https://github.com/sparkfun/OpenLog/wiki

Finally, don’t use Strings. They create memory and reliability problems on Arduino.

So if I understand you right, just use the serial.write(data) here and it will store to the Open Logger?

4

So if I understand you right

Isn’t the OpenLog manual/wiki clear enough?

5

jremington:

So if I understand you right

Isn’t the OpenLog manual/wiki clear enough?

I’m just double checking, and for me I guess not.

6

I suggest in addition to carefully going through the writeup, to study the example code for Arduino: https://github.com/sparkfun/OpenLog/wiki/Example-Code