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Diffstat (limited to 'libraries/Bridge/examples/Datalogger')
-rw-r--r-- | libraries/Bridge/examples/Datalogger/Datalogger.ino | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/libraries/Bridge/examples/Datalogger/Datalogger.ino b/libraries/Bridge/examples/Datalogger/Datalogger.ino new file mode 100644 index 0000000..2d792a4 --- /dev/null +++ b/libraries/Bridge/examples/Datalogger/Datalogger.ino @@ -0,0 +1,99 @@ +/* + SD card datalogger + + This example shows how to log data from three analog sensors + to an SD card mounted on the Arduino 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 Arduino 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. + + */ + +#include <FileIO.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\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: + Serial.println(dataString); + } + // if the file isn't open, pop up an error: + else { + Serial.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; +} |