1 | /*
|
---|
2 | SD card datalogger
|
---|
3 |
|
---|
4 | This example shows how to log data from three analog sensors
|
---|
5 | to an SD card mounted on the Arduino Y炭n using the Bridge library.
|
---|
6 |
|
---|
7 | The circuit:
|
---|
8 | * analog sensors on analog pins 0, 1 and 2
|
---|
9 | * SD card attached to SD card slot of the Arduino Y炭n
|
---|
10 |
|
---|
11 | Prepare your SD card creating an empty folder in the SD root
|
---|
12 | named "arduino". This will ensure that the Y炭n will create a link
|
---|
13 | to the SD to the "/mnt/sd" path.
|
---|
14 |
|
---|
15 | You can remove the SD card while the Linux and the
|
---|
16 | sketch are running but be careful not to remove it while
|
---|
17 | the system is writing to it.
|
---|
18 |
|
---|
19 | created 24 Nov 2010
|
---|
20 | modified 9 Apr 2012
|
---|
21 | by Tom Igoe
|
---|
22 | adapted to the Y炭n Bridge library 20 Jun 2013
|
---|
23 | by Federico Vanzati
|
---|
24 | modified 21 Jun 2013
|
---|
25 | by Tom Igoe
|
---|
26 |
|
---|
27 | This example code is in the public domain.
|
---|
28 |
|
---|
29 | http://arduino.cc/en/Tutorial/YunDatalogger
|
---|
30 |
|
---|
31 | */
|
---|
32 |
|
---|
33 | #include <FileIO.h>
|
---|
34 |
|
---|
35 | void setup() {
|
---|
36 | // Initialize the Bridge and the Serial
|
---|
37 | Bridge.begin();
|
---|
38 | Serial.begin(9600);
|
---|
39 | FileSystem.begin();
|
---|
40 |
|
---|
41 | while (!Serial); // wait for Serial port to connect.
|
---|
42 | Serial.println("Filesystem datalogger\n");
|
---|
43 | }
|
---|
44 |
|
---|
45 |
|
---|
46 | void loop () {
|
---|
47 | // make a string that start with a timestamp for assembling the data to log:
|
---|
48 | String dataString;
|
---|
49 | dataString += getTimeStamp();
|
---|
50 | dataString += " = ";
|
---|
51 |
|
---|
52 | // read three sensors and append to the string:
|
---|
53 | for (int analogPin = 0; analogPin < 3; analogPin++) {
|
---|
54 | int sensor = analogRead(analogPin);
|
---|
55 | dataString += String(sensor);
|
---|
56 | if (analogPin < 2) {
|
---|
57 | dataString += ","; // separate the values with a comma
|
---|
58 | }
|
---|
59 | }
|
---|
60 |
|
---|
61 | // open the file. note that only one file can be open at a time,
|
---|
62 | // so you have to close this one before opening another.
|
---|
63 | // The FileSystem card is mounted at the following "/mnt/FileSystema1"
|
---|
64 | File dataFile = FileSystem.open("/mnt/sd/datalog.txt", FILE_APPEND);
|
---|
65 |
|
---|
66 | // if the file is available, write to it:
|
---|
67 | if (dataFile) {
|
---|
68 | dataFile.println(dataString);
|
---|
69 | dataFile.close();
|
---|
70 | // print to the serial port too:
|
---|
71 | Serial.println(dataString);
|
---|
72 | }
|
---|
73 | // if the file isn't open, pop up an error:
|
---|
74 | else {
|
---|
75 | Serial.println("error opening datalog.txt");
|
---|
76 | }
|
---|
77 |
|
---|
78 | delay(15000);
|
---|
79 |
|
---|
80 | }
|
---|
81 |
|
---|
82 | // This function return a string with the time stamp
|
---|
83 | String getTimeStamp() {
|
---|
84 | String result;
|
---|
85 | Process time;
|
---|
86 | // date is a command line utility to get the date and the time
|
---|
87 | // in different formats depending on the additional parameter
|
---|
88 | time.begin("date");
|
---|
89 | time.addParameter("+%D-%T"); // parameters: D for the complete date mm/dd/yy
|
---|
90 | // T for the time hh:mm:ss
|
---|
91 | time.run(); // run the command
|
---|
92 |
|
---|
93 | // read the output of the command
|
---|
94 | while (time.available() > 0) {
|
---|
95 | char c = time.read();
|
---|
96 | if (c != '\n')
|
---|
97 | result += c;
|
---|
98 | }
|
---|
99 |
|
---|
100 | return result;
|
---|
101 | }
|
---|