RFduinoLogger.ino

/*
  RFduinoLogger

  This software is licensed under LGPL, v3
 
 Modified by Ruben Kertesz 11-9-03, 5/25/2014
  Using temperature reading on RFDuino as an example of how to log
   Using proper chip select (6)
    Using direct write of float value to datafile rather than converting to string
 
 Utilizes part of code  
 created  24 Nov 2010
 modified 9 Apr 2012
 by Tom Igoe
 which  is in the public domain.
 	 
 */

/*
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                       Version 3, 29 June 2007

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*/

#include <SPI.h>
#include <SD.h>
//#include "RTClib.h"

const int chipSelect = 6;
//RTC_Millis rtc;

void setup()
{
  // Open serial communications and wait for port to open:
  Serial.begin(9600,0,7);

  Serial.print("Initializing SD card...");
  // make sure that the default chip select pin is set to
  // output, even if you don't use it:
  pinMode(10, OUTPUT);

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

  // Serial.println("card initialized.");
}

char *dtostrf (double val, signed char width, unsigned char prec, char *sout) {
  char fmt[20];
  sprintf(fmt, "%%%d.%df", width, prec);
  sprintf(sout, fmt, val);
  return sout;
}

void loop()
{

  // make a string for assembling the data to log:
  String dataString = "";
  dataString += "Time,";
  dataString += millis();
  dataString += ",";


  dataString += "Temperature (celsius) = ,";
 // read the temp sensor and append to the string:
   float temp = RFduino_temperature(CELSIUS);
   char s_temp[20];
    dtostrf(temp,3,7,s_temp);
    dataString += s_temp;
   
  // 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);   ///DEBUGGING
  }  
  // if the file isn't open, pop up an error:
  else {
    //  Serial.println("error opening datalog.txt");
  } 

  // sample once every 5 seconds, otherwise set to ultra low power
  RFduino_ULPDelay( MILLISECONDS(5000) ); //cribbed from the temperature example
}