Arduino yun : Ecrire sur la carte sd

Le programme ci-dessous, permet d'écrire les données de A0 et A1 sur la carte SD de l'arduino yun.

Etape 1 :

Créer un fichier data.txt dans le répertoire arduino\www\data.txt

Etape 2 :

Téléverser le code ci-dessous dans l'arduino yun.

#include <FileIO.h>

#define led 13


void setup() {
  // Initialize the Bridge and the Serial
 Bridge.begin();
 delay(2000); 
 
 Serial.begin(9600);
 
 FileSystem.begin();
 delay(2000);

while (!SerialUSB); // wait for Serial port to connect.
 SerialUSB.println("Filesystem datalogger\n");

 pinMode(led,OUTPUT);
}


void loop() {
 // make a string that start with a timestamp for assembling the data to log:
 digitalWrite(led,LOW);
 
 String dataString;
 dataString += getTimeStamp();
 dataString += " = ";

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

// 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/sd/data.txt", FILE_APPEND);

// if the file is available, write to it:
 if (dataFile) {
 dataFile.println(dataString);
 dataFile.close();
 
 // print to the serial port too:
 SerialUSB.println(dataString);

digitalWrite(led,HIGH);
 delay(1000);
 
 }
 // if the file isn't open, pop up an error:
 else {
 SerialUSB.println("error opening datalog.txt");
 }

delay(15000);

}

// This function return a string with the time stamp
String getTimeStamp() {
 String result;
 Process time;
 // date is a command line utility to get the date and the time
 // in different formats depending on the additional parameter
 time.begin("date");
 time.addParameter("+%D-%T"); // parameters: D for the complete date mm/dd/yy
 // T for the time hh:mm:ss
 time.run(); // run the command

// read the output of the command
 while (time.available() > 0) {
 char c = time.read();
 if (c != '\n') {
 result += c;
 }
 }

return result;
}