Ethernet Shield Datalogger

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1/*
2
3  SD card datalogger
4
5  This example shows how to log data from three analog sensors
6
7  to an SD card using the SD library. Pin numbers reflect the default
8
9  SPI pins for Uno and Nano models
10
11  The circuit:
12
13   analog sensors on analog ins 0, 1, and 2
14
15   SD card attached to SPI bus as follows:
16
17 ** SDO - pin 11
18
19 ** SDI - pin 12
20
21 ** CLK - pin 13
22
23 ** CS - depends on your SD card shield or module.
24
25        Pin 10 used here for consistency with other Arduino examples
26
27    (for MKRZero SD: SDCARD_SS_PIN)
28
29  created  24 Nov 2010
30
31  modified  24 July 2020
32
33  by Tom Igoe
34
35  This example code is in the public domain.
36
37*/
38
39#include <SPI.h>
40#include <SD.h>
41
42const int chipSelect = 10;
43
44void setup() {
45
46  // Open serial communications and wait for port to open:
47
48  Serial.begin(9600);
49
50  // wait for Serial Monitor to connect. Needed for native USB port boards only:
51
52  while (!Serial);
53
54  Serial.print("Initializing SD card...");
55
56  if (!SD.begin(chipSelect)) {
57
58    Serial.println("initialization failed. Things to check:");
59
60    Serial.println("1. is a card inserted?");
61
62    Serial.println("2. is your wiring correct?");
63
64    Serial.println("3. did you change the chipSelect pin to match your shield or module?");
65
66    Serial.println("Note: press reset or reopen this serial monitor after fixing your issue!");
67
68    while (true);
69
70  }
71
72  Serial.println("initialization done.");
73}
74
75void loop() {
76
77  // make a string for assembling the data to log:
78
79  String dataString = "";
80
81  // read three sensors and append to the string:
82
83  for (int analogPin = 0; analogPin < 3; analogPin++) {
84
85    int sensor = analogRead(analogPin);
86
87    dataString += String(sensor);
88
89    if (analogPin < 2) {
90
91      dataString += ",";
92
93    }
94
95  }
96
97  // open the file. note that only one file can be open at a time,
98
99  // so you have to close this one before opening another.
100
101  File dataFile = SD.open("datalog.txt", FILE_WRITE);
102
103  // if the file is available, write to it:
104
105  if (dataFile) {
106
107    dataFile.println(dataString);
108
109    dataFile.close();
110
111    // print to the serial port too:
112
113    Serial.println(dataString);
114
115  }
116
117  // if the file isn't open, pop up an error:
118
119  else {
120
121    Serial.println("error opening datalog.txt");
122
123  }
124}