| /* | |
| SD card datalogger | |
| This example shows how to log data from three analog sensors | |
| to an SD card mounted on the YunShield/Yún using the Bridge library. | |
| The circuit: | |
| * analog sensors on analog pins 0, 1 and 2 | |
| * SD card attached to SD card slot of the YunShield/Yún | |
| Prepare your SD card creating an empty folder in the SD root | |
| named "arduino". This will ensure that the Yún will create a link | |
| to the SD to the "/mnt/sd" path. | |
| 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 Yún Bridge library 20 Jun 2013 | |
| by Federico Vanzati | |
| modified 21 Jun 2013 | |
| by Tom Igoe | |
| This example code is in the public domain. | |
| http://www.arduino.cc/en/Tutorial/YunDatalogger | |
| */ | |
| void setup() { | |
| // Initialize the Bridge and the Serial | |
| Bridge.begin(); | |
| Serial.begin(9600); | |
| FileSystem.begin(); | |
| while (!SerialUSB); // wait for Serial port to connect. | |
| SerialUSB.println("Filesystem datalogger\n"); | |
| } | |
| void loop() { | |
| // make a string that start with a timestamp for assembling the data to log: | |
| String dataString; | |
| dataString += getTimeStamp(); | |
| 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 += ","; // 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/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: | |
| SerialUSB.println(dataString); | |
| } | |
| // 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; | |
| } | |