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97 lines
2.3 KiB
C++
97 lines
2.3 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 Linux using the Bridge library.
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The circuit:
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* analog sensors on analog ins 0, 1, and 2
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* SD card attached to SD card slot of the Arduino Yun
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You are allowed to remove the SD card while the Linux and the
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sketch is running but becareful to don't remove it while
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the system is writing on 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 Yun Bridge library 20 Jun 2013
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by Federico Vanzati
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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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#include <Console.h>
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void setup() {
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// Initialize the Bridge and the Console
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Bridge.begin();
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Console.begin();
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while(!Console){
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; // wait for Console port to connect.
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}
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// see if the card is present and can be initialized:
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if (!SD.begin()) {
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Console.println("SD card failed, or not present");
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// don't do anything more:
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return;
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}
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Console.println("SD card initialized.");
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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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addTimeStamp(dataString);
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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 += ",";
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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 SD card is mounted at the following "/mnt/sda1"
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File dataFile = SD.open("/mnt/sda1/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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Console.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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Console.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 append a time stamp to the string passed as argument
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void addTimeStamp(String &string) {
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Process time;
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time.begin("date");
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time.addParameter("+%D-%T");
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time.run();
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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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string += c;
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}
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}
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