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/*
SD card datalogger
This example shows how to log data from three analog sensors
to an SD card mounted on the Arduino Yun using the Bridge library.
The circuit:
* analog sensors on analog ins 0, 1, and 2
* SD card attached to SD card slot of the Arduino Yun
You can remove the SD card while the Linux and the
sketch are running but be careful not to remove it while
the system is writing to it.
created 24 Nov 2010
modified 9 Apr 2012
by Tom Igoe
adapted to the Yun Bridge library 20 Jun 2013
by Federico Vanzati
modified 21 Jun 2013
by Tom Igoe
This example code is in the public domain.
*/
#include <FileIO.h>
#include <Serial.h>
void setup() {
// Initialize the Bridge and the Serial
Bridge.begin();
Serial.begin(9600);
FileSystem.begin();
while(!Serial); // wait for Serial port to connect.
Serial.println("Filesystem datalogger");
}
void loop () {
// make a string that start with a timestamp for assembling the data to log:
String dataString = "";
dataString += addTimeStamp();
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.
// The FileSystem card is mounted at the following "/mnt/FileSystema1"
File dataFile = FileSystem.open("/mnt/sda1/datalog.txt", FILE_APPEND);
// 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");
}
delay(15000);
}
// This function append a time stamp to the string passed as argument
String addTimeStamp() {
String result;
Process time;
time.begin("date");
time.addParameter("+%D-%T");
time.run();
while(time.available()>0) {
char c = time.read();
if(c != '\n')
result += c;
}
}
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