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100 lines
2.6 KiB
C++
100 lines
2.6 KiB
C++
/*
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SD card datalogger
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This example shows how to log data from three analog sensors
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to an SD card mounted on the Arduino Yún using the Bridge library.
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The circuit:
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* analog sensors on analog pins 0, 1 and 2
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* SD card attached to SD card slot of the Arduino Yún
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Prepare your SD card creating an empty folder in the SD root
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named "arduino". This will ensure that the Yún will create a link
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to the SD to the "/mnt/sd" path.
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You can remove the SD card while the Linux and the
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sketch are running but be careful not to remove it while
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the system is writing to it.
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created 24 Nov 2010
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modified 9 Apr 2012
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by Tom Igoe
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adapted to the Yún Bridge library 20 Jun 2013
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by Federico Vanzati
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modified 21 Jun 2013
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by Tom Igoe
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This example code is in the public domain.
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*/
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#include <FileIO.h>
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void setup() {
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// Initialize the Bridge and the Serial
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Bridge.begin();
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Serial.begin(9600);
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FileSystem.begin();
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while(!Serial); // wait for Serial port to connect.
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Serial.println("Filesystem datalogger\n");
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}
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void loop () {
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// make a string that start with a timestamp for assembling the data to log:
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String dataString;
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dataString += getTimeStamp();
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dataString += " = ";
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// read three sensors and append to the string:
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for (int analogPin = 0; analogPin < 3; analogPin++) {
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int sensor = analogRead(analogPin);
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dataString += String(sensor);
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if (analogPin < 2) {
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dataString += ","; // separate the values with a comma
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}
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}
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// open the file. note that only one file can be open at a time,
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// so you have to close this one before opening another.
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// The FileSystem card is mounted at the following "/mnt/FileSystema1"
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File dataFile = FileSystem.open("/mnt/sd/datalog.txt", FILE_APPEND);
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// if the file is available, write to it:
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if (dataFile) {
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dataFile.println(dataString);
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dataFile.close();
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// print to the serial port too:
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Serial.println(dataString);
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}
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// if the file isn't open, pop up an error:
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else {
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Serial.println("error opening datalog.txt");
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}
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delay(15000);
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}
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// This function return a string with the time stamp
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String getTimeStamp() {
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String result;
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Process time;
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// date is a command line utility to get the date and the time
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// in different formats depending on the additional parameter
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time.begin("date");
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time.addParameter("+%D-%T"); // parameters: D for the complete date mm/dd/yy
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// T for the time hh:mm:ss
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time.run(); // run the command
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// read the output of the command
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while(time.available()>0) {
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char c = time.read();
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if(c != '\n')
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result += c;
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}
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return result;
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}
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