Arduino Temperature Logger With Sd Card

1#include <SPI.h> //for the SD card module
2#include <SD.h> // for the  SD card
3#include <DHT.h> // for the DHT sensor
4#include <RTClib.h> // for  the RTC
5
6//define DHT pin
7#define DHTPIN 2     // what pin we're connected  to
8
9// uncomment whatever type you're using
10#define DHTTYPE DHT11   //  DHT 11 
11//#define DHTTYPE DHT22   // DHT 22  (AM2302)
12//#define DHTTYPE DHT21   // DHT 21 (AM2301)
13
14// initialize DHT sensor for normal 16mhz Arduino
15DHT  dht(DHTPIN, DHTTYPE);
16
17// change this to match your SD shield or module;
18//  Arduino Ethernet shield and modules: pin 4
19// Data loggin SD shields and modules:  pin 10
20// Sparkfun SD shield: pin 8
21const int chipSelect = 4; 
22
23// Create  a file to store the data
24File myFile;
25
26// RTC
27RTC_DS1307 rtc;
28
29void  setup() {
30  //initializing the DHT sensor
31  dht.begin();
32
33  //initializing  Serial monitor
34  Serial.begin(9600);
35  
36  // setup for the RTC
37  while(!Serial);  // for Leonardo/Micro/Zero
38    if(! rtc.begin()) {
39      Serial.println("Couldn't  find RTC");
40      while (1);
41    }
42    else {
43      // following line  sets the RTC to the date & time this sketch was compiled
44      rtc.adjust(DateTime(F(__DATE__),  F(__TIME__)));
45    }
46    if(! rtc.isrunning()) {
47      Serial.println("RTC  is NOT running!");
48    }
49    
50  // setup for the SD card
51  Serial.print("Initializing  SD card...");
52
53  if(!SD.begin(chipSelect)) {
54    Serial.println("initialization  failed!");
55    return;
56  }
57  Serial.println("initialization done.");
58    
59  //open file
60  myFile=SD.open("DATA.txt", FILE_WRITE);
61
62  //  if the file opened ok, write to it:
63  if (myFile) {
64    Serial.println("File  opened ok");
65    // print the headings for our data
66    myFile.println("Date,Time,Temperature  ºC");
67  }
68  myFile.close();
69}
70
71void loggingTime() {
72  DateTime  now = rtc.now();
73  myFile = SD.open("DATA.txt", FILE_WRITE);
74  if (myFile)  {
75    myFile.print(now.year(), DEC);
76    myFile.print('/');
77    myFile.print(now.month(),  DEC);
78    myFile.print('/');
79    myFile.print(now.day(), DEC);
80    myFile.print(',');
81    myFile.print(now.hour(), DEC);
82    myFile.print(':');
83    myFile.print(now.minute(),  DEC);
84    myFile.print(':');
85    myFile.print(now.second(), DEC);
86    myFile.print(",");
87  }
88  Serial.print(now.year(), DEC);
89  Serial.print('/');
90  Serial.print(now.month(),  DEC);
91  Serial.print('/');
92  Serial.println(now.day(), DEC);
93  Serial.print(now.hour(),  DEC);
94  Serial.print(':');
95  Serial.print(now.minute(), DEC);
96  Serial.print(':');
97  Serial.println(now.second(), DEC);
98  myFile.close();
99  delay(1000);  
100}
101
102void  loggingTemperature() {
103  // Reading temperature or humidity takes about 250 milliseconds!
104  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
105  // Read temperature as Celsius
106  float t = dht.readTemperature();
107  // Read  temperature as Fahrenheit
108  //float f = dht.readTemperature(true);
109  
110  // Check if any reads failed and exit early (to try again).
111  if  (isnan(t)  /*|| isnan(f)*/) {
112    Serial.println("Failed to read from DHT sensor!");
113    return;
114  }
115  
116  //debugging purposes
117  Serial.print("Temperature:  "); 
118  Serial.print(t);
119  Serial.println(" *C");
120  //Serial.print(f);
121  //Serial.println(" *F\	"); 
122  
123  myFile = SD.open("DATA.txt", FILE_WRITE);
124  if (myFile) {
125    Serial.println("open with success");
126    myFile.print(t);
127    myFile.println(",");
128  }
129  myFile.close();
130}
131
132void loop() {
133  loggingTime();
134  loggingTemperature();
135  delay(5000);
136}