Automatic Tropical Terrarium

This project is my journey of developing an automated terrarium for tropical plants.

Feb 10, 2022

•

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1 respects

plants

monitoring

garden

Components and supplies

Adafruit Data Logger Shield

RGB LCD Shield Kit, 16x2 Character Display

Terrarium Moisting System

Axial Fan, 12 V

Arduino UNO

Relay (generic)

DHT22 temperature-humidity sensor

Project description

Code

terra_log_1.ino

arduino

This is the beginning of coding for the terrarium. For now, the code is only supposed to read the temperature in the terrarium, compare it to the threshold and turn on a fan when the temp is above the threshold. However, for now the fan is not connected to a power supply. The only purpose is to log data about temperature and humidity to the SD card so I can learn about the climate in the terrarium first. Critical termperatures or humdities are not reached.

1#include <DHT.h> // include library
2#include <SPI.h>
3#include <SD.h>
4#include  "RTClib.h"
5
6const int chipSelect = 10;
7const int relayPin1 = 8;
8const  int DHTPIN = 7;
9
10#define DHTTYPE DHT22
11DHT dht(DHTPIN, DHTTYPE);// Initialize  DHT sensor
12RTC_DS1307 rtc;
13
14File myFile;
15char dateBuffer[12];
16/********************************/
17void  setup() {
18  // Open serial communications and wait for port to open:
19  Serial.begin(9600);
20  while (!Serial) {
21    ; // wait for serial port to connect. Needed for native  USB port only
22  }
23  if (! rtc.begin()) {
24    Serial.println("No RTC");  //Could not fint RTC
25    Serial.flush();
26    abort();
27  }
28  if (! rtc.isrunning())  {
29    Serial.println("RTC off, set the time");
30    rtc.adjust(DateTime(F(__DATE__),  F(__TIME__)));
31  }
32  //rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
33
34
35  Serial.print("Initializing SD card...");
36  if (!SD.begin(chipSelect)) {
37    Serial.println("initialization failed!");
38    while (1);
39  }
40  Serial.println("initialization  done.");
41  if (SD.exists("terralog.txt")) {
42    Serial.println("terralog.txt  exists.");
43  } else {
44    Serial.println("terralog.txt doesn't exist.");
45    Serial.println("Creating terraaaaa.txt");
46    myFile = SD.open("terralog.txt",  FILE_WRITE);
47    myFile.close();
48    if (SD.exists("terralog.txt")) {
49      Serial.println("terralog.txt was successfully created.");
50    } else  {
51      Serial.println("File creation failed.");
52    }
53  }
54
55  pinMode(relayPin1,  OUTPUT);
56  dht.begin();
57
58  Serial.println("date,time,temperature,humidity,fanState");
59}
60
61void  loop()
62{
63
64  float h = dht.readHumidity();
65  float t = dht.readTemperature();
66  // Check if any reads failed and exit early (to try again).
67  if (isnan(h)  || isnan(t)) {
68    Serial.println("Failed to read from DHT sensor!");
69    return;
70  }
71
72  DateTime time = rtc.now();
73
74  sprintf(dateBuffer, "%02u-%02u-%04u",  time.day(), time.month(), time.year());
75  Serial.print(dateBuffer);
76  Serial.print(",");
77  sprintf(dateBuffer, "%02u:%02u:%02u", time.hour(), time.minute(), time.second());
78  Serial.print(dateBuffer);
79  Serial.print(",");
80  Serial.print(t);
81  Serial.print(",");
82  Serial.print(h);
83  Serial.print(",");
84
85  File  myFile = SD.open("terralog.txt", FILE_WRITE);
86
87  if (myFile) {
88    sprintf(dateBuffer,  "%02u-%02u-%04u", time.day(), time.month(), time.year());
89    myFile.print(dateBuffer);
90    myFile.print(",");
91    sprintf(dateBuffer, "%02u:%02u:%02u", time.hour(),  time.minute(), time.second());
92    myFile.print(dateBuffer);
93    myFile.print(",");
94    myFile.print(t);
95    myFile.print(",");
96    myFile.print(h);
97    myFile.print(",");
98    myFile.close();
99  }
100  else {
101    Serial.println("error opening terralog.txt");
102  }
103  if (t >= 27) {
104    digitalWrite(relayPin1, HIGH);
105    Serial.println("on");
106    File myFile = SD.open("terralog.txt", FILE_WRITE);
107    myFile.println("on");
108    myFile.close();
109  }
110  else {
111    digitalWrite(relayPin1, LOW);
112    Serial.println("off");
113    File myFile = SD.open("terralog.txt", FILE_WRITE);
114    myFile.println("off");
115    myFile.close();
116  }
117
118  delay(30000);
119
120}
121

#include <DHT.h> // include library
#include <SPI.h>
#include <SD.h>
#include  "RTClib.h"

const int chipSelect = 10;
const int relayPin1 = 8;
const  int DHTPIN = 7;

#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);// Initialize  DHT sensor
RTC_DS1307 rtc;

File myFile;
char dateBuffer[12];
/********************************/
void  setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native  USB port only
  }
  if (! rtc.begin()) {
    Serial.println("No RTC");  //Could not fint RTC
    Serial.flush();
    abort();
  }
  if (! rtc.isrunning())  {
    Serial.println("RTC off, set the time");
    rtc.adjust(DateTime(F(__DATE__),  F(__TIME__)));
  }
  //rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));


  Serial.print("Initializing SD card...");
  if (!SD.begin(chipSelect)) {
    Serial.println("initialization failed!");
    while (1);
  }
  Serial.println("initialization  done.");
  if (SD.exists("terralog.txt")) {
    Serial.println("terralog.txt  exists.");
  } else {
    Serial.println("terralog.txt doesn't exist.");
    Serial.println("Creating terraaaaa.txt");
    myFile = SD.open("terralog.txt",  FILE_WRITE);
    myFile.close();
    if (SD.exists("terralog.txt")) {
      Serial.println("terralog.txt was successfully created.");
    } else  {
      Serial.println("File creation failed.");
    }
  }

  pinMode(relayPin1,  OUTPUT);
  dht.begin();

  Serial.println("date,time,temperature,humidity,fanState");
}

void  loop()
{

  float h = dht.readHumidity();
  float t = dht.readTemperature();
  // Check if any reads failed and exit early (to try again).
  if (isnan(h)  || isnan(t)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  DateTime time = rtc.now();

  sprintf(dateBuffer, "%02u-%02u-%04u",  time.day(), time.month(), time.year());
  Serial.print(dateBuffer);
  Serial.print(",");
  sprintf(dateBuffer, "%02u:%02u:%02u", time.hour(), time.minute(), time.second());
  Serial.print(dateBuffer);
  Serial.print(",");
  Serial.print(t);
  Serial.print(",");
  Serial.print(h);
  Serial.print(",");

  File  myFile = SD.open("terralog.txt", FILE_WRITE);

  if (myFile) {
    sprintf(dateBuffer,  "%02u-%02u-%04u", time.day(), time.month(), time.year());
    myFile.print(dateBuffer);
    myFile.print(",");
    sprintf(dateBuffer, "%02u:%02u:%02u", time.hour(),  time.minute(), time.second());
    myFile.print(dateBuffer);
    myFile.print(",");
    myFile.print(t);
    myFile.print(",");
    myFile.print(h);
    myFile.print(",");
    myFile.close();
  }
  else {
    Serial.println("error opening terralog.txt");
  }
  if (t >= 27) {
    digitalWrite(relayPin1, HIGH);
    Serial.println("on");
    File myFile = SD.open("terralog.txt", FILE_WRITE);
    myFile.println("on");
    myFile.close();
  }
  else {
    digitalWrite(relayPin1, LOW);
    Serial.println("off");
    File myFile = SD.open("terralog.txt", FILE_WRITE);
    myFile.println("off");
    myFile.close();
  }

  delay(30000);

}

terra_log_fan_and_moisting_2

abap

This is a further developed code than the previous one. I remade everything in a way I think is more optimized and more functional.

1#include <DHT.h>
2#include <SPI.h>
3#include <SD.h>
4#include <Wire.h>
5#include  <LiquidCrystal_I2C.h>
6#include "RTClib.h"
7
8//const int lightRelay = 12;
9const  int rainRelay = 11;
10const int fanRelay = 8;
11const int chipSelect = 10;
12const  int DHTPIN_1 = 5;
13const int DHTPIN_2 = 6;
14
15int fanState = 0;
16int rainState  = 0;
17
18int maxTemp = 29;
19int normTemp = 25;
20
21int minHum = 96;
22
23int  i = 0;
24
25LiquidCrystal_I2C lcd(0x27, 16, 2);
26
27#define DHTTYPE DHT22
28DHT  dht_1(DHTPIN_1, DHTTYPE);
29DHT dht_2(DHTPIN_2, DHTTYPE);
30RTC_DS1307 rtc;
31
32File  myFile;
33char dateBuffer[12];
34char sensBuffer[10];
35
36void setup() {
37  Serial.begin(9600);
38  while (!Serial) {
39    ;
40  }
41
42  lcd.init();
43  lcd.backlight();
44  lcd.setCursor(0, 0);
45
46  if (! rtc.begin()) {
47    error("No  RTC");
48    Serial.flush();
49    abort();
50  }
51
52  if (! rtc.isrunning())  {
53    error("RTC was off. Setting new time.");
54    rtc.adjust(DateTime(F(__DATE__),  F(__TIME__)));
55  }
56  //rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
57  Serial.print(F("Initializing SD card..."));
58  if (!SD.begin(chipSelect))  {
59    error("SD initialization failed");
60    while (1);
61  }
62
63  Serial.println(F("initialization  done."));
64  if (SD.exists(F("terralog.txt"))) {
65    Serial.println(F("terralog.txt  exists."));
66  } else {
67    Serial.println(F("terralog.txt doesn't exist."));
68    Serial.println(F("Creating terraaaaa.txt"));
69    myFile = SD.open("terralog.txt",  FILE_WRITE);
70    myFile.println("date,time,temp_1,temp_2,hum_1,hum_2,fanState,  rainState,i");
71    myFile.close();
72    if (SD.exists("terralog.txt")) {
73      Serial.println(F("terralog.txt was successfully created."));
74    } else  {
75      Serial.println(F("File creation failed."));
76    }
77  }
78
79  pinMode(fanRelay, OUTPUT);
80  dht_1.begin();
81  dht_2.begin();
82  Serial.println(F("date,time,temp_1,temp_2,hum_1,hum_2,fanState,rainState,i"));
83}
84
85void  loop() {
86  float h_1 = dht_1.readHumidity();
87  float t_1 = dht_1.readTemperature();
88  if (isnan(h_1) || isnan(t_1)) {
89    error("DHT 1");
90    return;
91  }
92  float h_2 = dht_2.readHumidity();
93  float t_2 = dht_2.readTemperature();
94  if (isnan(h_2) || isnan(t_2)) {
95    error("DHT 2");
96    return;
97  }
98
99  DateTime time = rtc.now();
100  lcd.setCursor(0, 0);
101  lcd.print(t_1);
102  lcd.print(", ");
103  lcd.print(h_1);
104  lcd.setCursor(0, 1);
105  lcd.print(t_2);
106  lcd.print(", ");
107  lcd.print(h_2);
108
109  sprintf(dateBuffer, "%02u-%02u-%04u",  time.day(), time.month(), time.year());
110  Serial.print(dateBuffer);
111  Serial.print(",");
112  sprintf(dateBuffer, "%02u:%02u:%02u", time.hour(), time.minute(), time.second());
113  Serial.print(dateBuffer);
114  Serial.print(F(","));
115  Serial.print(t_1);
116  Serial.print(F(","));
117  Serial.print(t_2);
118  Serial.print(F(","));
119  Serial.print(h_1);
120  Serial.print(F(","));
121  Serial.print(h_2);
122  Serial.print(F(","));
123
124  File myFile = SD.open("terralog.txt", FILE_WRITE);
125  if (!myFile) {
126    error("logfile");
127  }
128  sprintf(dateBuffer, "%02u-%02u-%04u", time.day(), time.month(), time.year());
129  myFile.print(dateBuffer);
130  myFile.print(",");
131  sprintf(dateBuffer, "%02u:%02u:%02u",  time.hour(), time.minute(), time.second());
132  myFile.print(dateBuffer);
133  myFile.print(",");
134  myFile.print(t_1);
135  myFile.print(",");
136  myFile.print(t_2);
137  myFile.print(",");
138  myFile.print(h_1);
139  myFile.print(",");
140  myFile.print(h_2);
141  myFile.print(",");
142
143  //
144  // Temperature Control
145  //
146
147  if (t_1 >= maxTemp) {
148    fanState  = 1;
149    digitalWrite(fanRelay, HIGH);
150    Serial.print(fanState);
151    myFile.print(fanState);
152  }
153  else if (t_1 < maxTemp && t_1 >= normTemp) {
154    Serial.print(fanState);
155    myFile.print(fanState);
156  }
157  else if (t_1 < normTemp) {
158    fanState  = 0;
159    digitalWrite(fanRelay, LOW);
160    Serial.print(fanState);
161    myFile.print(fanState);
162  }
163
164  //
165  // Rain Control
166  //
167
168  if (h_1 < 80 && fanState ==  0) {
169    if (i <= 4) {
170      rainState = 1;
171      digitalWrite(rainRelay,  HIGH);
172      i++;
173    }
174    else if (i > 4 && i <= 300) {
175      rainState  = 2;
176      digitalWrite(rainRelay, LOW);
177      i++;
178    }
179  }
180  else  {
181    rainState = 0;
182    i = 0;
183  }
184  Serial.print(",");
185  Serial.print(rainState);
186  Serial.print(",");
187  Serial.print(i);
188  
189  myFile.println();
190  myFile.close();
191  Serial.println();
192  delay(1000);
193}
194
195void error(char *str) {
196  Serial.print(F("Fehler:  "));
197  Serial.println(str);
198  lcd.clear();
199  lcd.print("Error: ");
200  lcd.print(str);
201  delay(5000);
202  lcd.clear();
203  //while(1); //halt command
204}

#include <DHT.h>
#include <SPI.h>
#include <SD.h>
#include <Wire.h>
#include  <LiquidCrystal_I2C.h>
#include "RTClib.h"

//const int lightRelay = 12;
const  int rainRelay = 11;
const int fanRelay = 8;
const int chipSelect = 10;
const  int DHTPIN_1 = 5;
const int DHTPIN_2 = 6;

int fanState = 0;
int rainState  = 0;

int maxTemp = 29;
int normTemp = 25;

int minHum = 96;

int  i = 0;

LiquidCrystal_I2C lcd(0x27, 16, 2);

#define DHTTYPE DHT22
DHT  dht_1(DHTPIN_1, DHTTYPE);
DHT dht_2(DHTPIN_2, DHTTYPE);
RTC_DS1307 rtc;

File  myFile;
char dateBuffer[12];
char sensBuffer[10];

void setup() {
  Serial.begin(9600);
  while (!Serial) {
    ;
  }

  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);

  if (! rtc.begin()) {
    error("No  RTC");
    Serial.flush();
    abort();
  }

  if (! rtc.isrunning())  {
    error("RTC was off. Setting new time.");
    rtc.adjust(DateTime(F(__DATE__),  F(__TIME__)));
  }
  //rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  Serial.print(F("Initializing SD card..."));
  if (!SD.begin(chipSelect))  {
    error("SD initialization failed");
    while (1);
  }

  Serial.println(F("initialization  done."));
  if (SD.exists(F("terralog.txt"))) {
    Serial.println(F("terralog.txt  exists."));
  } else {
    Serial.println(F("terralog.txt doesn't exist."));
    Serial.println(F("Creating terraaaaa.txt"));
    myFile = SD.open("terralog.txt",  FILE_WRITE);
    myFile.println("date,time,temp_1,temp_2,hum_1,hum_2,fanState,  rainState,i");
    myFile.close();
    if (SD.exists("terralog.txt")) {
      Serial.println(F("terralog.txt was successfully created."));
    } else  {
      Serial.println(F("File creation failed."));
    }
  }

  pinMode(fanRelay, OUTPUT);
  dht_1.begin();
  dht_2.begin();
  Serial.println(F("date,time,temp_1,temp_2,hum_1,hum_2,fanState,rainState,i"));
}

void  loop() {
  float h_1 = dht_1.readHumidity();
  float t_1 = dht_1.readTemperature();
  if (isnan(h_1) || isnan(t_1)) {
    error("DHT 1");
    return;
  }
  float h_2 = dht_2.readHumidity();
  float t_2 = dht_2.readTemperature();
  if (isnan(h_2) || isnan(t_2)) {
    error("DHT 2");
    return;
  }

  DateTime time = rtc.now();
  lcd.setCursor(0, 0);
  lcd.print(t_1);
  lcd.print(", ");
  lcd.print(h_1);
  lcd.setCursor(0, 1);
  lcd.print(t_2);
  lcd.print(", ");
  lcd.print(h_2);

  sprintf(dateBuffer, "%02u-%02u-%04u",  time.day(), time.month(), time.year());
  Serial.print(dateBuffer);
  Serial.print(",");
  sprintf(dateBuffer, "%02u:%02u:%02u", time.hour(), time.minute(), time.second());
  Serial.print(dateBuffer);
  Serial.print(F(","));
  Serial.print(t_1);
  Serial.print(F(","));
  Serial.print(t_2);
  Serial.print(F(","));
  Serial.print(h_1);
  Serial.print(F(","));
  Serial.print(h_2);
  Serial.print(F(","));

  File myFile = SD.open("terralog.txt", FILE_WRITE);
  if (!myFile) {
    error("logfile");
  }
  sprintf(dateBuffer, "%02u-%02u-%04u", time.day(), time.month(), time.year());
  myFile.print(dateBuffer);
  myFile.print(",");
  sprintf(dateBuffer, "%02u:%02u:%02u",  time.hour(), time.minute(), time.second());
  myFile.print(dateBuffer);
  myFile.print(",");
  myFile.print(t_1);
  myFile.print(",");
  myFile.print(t_2);
  myFile.print(",");
  myFile.print(h_1);
  myFile.print(",");
  myFile.print(h_2);
  myFile.print(",");

  //
  // Temperature Control
  //

  if (t_1 >= maxTemp) {
    fanState  = 1;
    digitalWrite(fanRelay, HIGH);
    Serial.print(fanState);
    myFile.print(fanState);
  }
  else if (t_1 < maxTemp && t_1 >= normTemp) {
    Serial.print(fanState);
    myFile.print(fanState);
  }
  else if (t_1 < normTemp) {
    fanState  = 0;
    digitalWrite(fanRelay, LOW);
    Serial.print(fanState);
    myFile.print(fanState);
  }

  //
  // Rain Control
  //

  if (h_1 < 80 && fanState ==  0) {
    if (i <= 4) {
      rainState = 1;
      digitalWrite(rainRelay,  HIGH);
      i++;
    }
    else if (i > 4 && i <= 300) {
      rainState  = 2;
      digitalWrite(rainRelay, LOW);
      i++;
    }
  }
  else  {
    rainState = 0;
    i = 0;
  }
  Serial.print(",");
  Serial.print(rainState);
  Serial.print(",");
  Serial.print(i);
  
  myFile.println();
  myFile.close();
  Serial.println();
  delay(1000);
}

void error(char *str) {
  Serial.print(F("Fehler:  "));
  Serial.println(str);
  lcd.clear();
  lcd.print("Error: ");
  lcd.print(str);
  delay(5000);
  lcd.clear();
  //while(1); //halt command
}

terra_log_fan_and_moisting_2

abap

This is a further developed code than the previous one. I remade everything in a way I think is more optimized and more functional.

1#include <DHT.h>
2#include <SPI.h>
3#include <SD.h>
4#include <Wire.h>
5#include   <LiquidCrystal_I2C.h>
6#include "RTClib.h"
7
8//const int lightRelay = 12;
9const   int rainRelay = 11;
10const int fanRelay = 8;
11const int chipSelect = 10;
12const   int DHTPIN_1 = 5;
13const int DHTPIN_2 = 6;
14
15int fanState = 0;
16int rainState   = 0;
17
18int maxTemp = 29;
19int normTemp = 25;
20
21int minHum = 96;
22
23int   i = 0;
24
25LiquidCrystal_I2C lcd(0x27, 16, 2);
26
27#define DHTTYPE DHT22
28DHT   dht_1(DHTPIN_1, DHTTYPE);
29DHT dht_2(DHTPIN_2, DHTTYPE);
30RTC_DS1307 rtc;
31
32File   myFile;
33char dateBuffer[12];
34char sensBuffer[10];
35
36void setup() {
37   Serial.begin(9600);
38  while (!Serial) {
39    ;
40  }
41
42  lcd.init();
43   lcd.backlight();
44  lcd.setCursor(0, 0);
45
46  if (! rtc.begin()) {
47    error("No   RTC");
48    Serial.flush();
49    abort();
50  }
51
52  if (! rtc.isrunning())   {
53    error("RTC was off. Setting new time.");
54    rtc.adjust(DateTime(F(__DATE__),   F(__TIME__)));
55  }
56  //rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
57   Serial.print(F("Initializing SD card..."));
58  if (!SD.begin(chipSelect))   {
59    error("SD initialization failed");
60    while (1);
61  }
62
63  Serial.println(F("initialization   done."));
64  if (SD.exists(F("terralog.txt"))) {
65    Serial.println(F("terralog.txt   exists."));
66  } else {
67    Serial.println(F("terralog.txt doesn't exist."));
68     Serial.println(F("Creating terraaaaa.txt"));
69    myFile = SD.open("terralog.txt",   FILE_WRITE);
70    myFile.println("date,time,temp_1,temp_2,hum_1,hum_2,fanState,   rainState,i");
71    myFile.close();
72    if (SD.exists("terralog.txt")) {
73       Serial.println(F("terralog.txt was successfully created."));
74    } else   {
75      Serial.println(F("File creation failed."));
76    }
77  }
78
79   pinMode(fanRelay, OUTPUT);
80  dht_1.begin();
81  dht_2.begin();
82  Serial.println(F("date,time,temp_1,temp_2,hum_1,hum_2,fanState,rainState,i"));
83}
84
85void   loop() {
86  float h_1 = dht_1.readHumidity();
87  float t_1 = dht_1.readTemperature();
88   if (isnan(h_1) || isnan(t_1)) {
89    error("DHT 1");
90    return;
91  }
92   float h_2 = dht_2.readHumidity();
93  float t_2 = dht_2.readTemperature();
94   if (isnan(h_2) || isnan(t_2)) {
95    error("DHT 2");
96    return;
97  }
98
99   DateTime time = rtc.now();
100  lcd.setCursor(0, 0);
101  lcd.print(t_1);
102   lcd.print(", ");
103  lcd.print(h_1);
104  lcd.setCursor(0, 1);
105  lcd.print(t_2);
106   lcd.print(", ");
107  lcd.print(h_2);
108
109  sprintf(dateBuffer, "%02u-%02u-%04u",   time.day(), time.month(), time.year());
110  Serial.print(dateBuffer);
111  Serial.print(",");
112   sprintf(dateBuffer, "%02u:%02u:%02u", time.hour(), time.minute(), time.second());
113   Serial.print(dateBuffer);
114  Serial.print(F(","));
115  Serial.print(t_1);
116   Serial.print(F(","));
117  Serial.print(t_2);
118  Serial.print(F(","));
119   Serial.print(h_1);
120  Serial.print(F(","));
121  Serial.print(h_2);
122  Serial.print(F(","));
123
124   File myFile = SD.open("terralog.txt", FILE_WRITE);
125  if (!myFile) {
126    error("logfile");
127   }
128  sprintf(dateBuffer, "%02u-%02u-%04u", time.day(), time.month(), time.year());
129   myFile.print(dateBuffer);
130  myFile.print(",");
131  sprintf(dateBuffer, "%02u:%02u:%02u",   time.hour(), time.minute(), time.second());
132  myFile.print(dateBuffer);
133  myFile.print(",");
134   myFile.print(t_1);
135  myFile.print(",");
136  myFile.print(t_2);
137  myFile.print(",");
138   myFile.print(h_1);
139  myFile.print(",");
140  myFile.print(h_2);
141  myFile.print(",");
142
143   //
144  // Temperature Control
145  //
146
147  if (t_1 >= maxTemp) {
148    fanState   = 1;
149    digitalWrite(fanRelay, HIGH);
150    Serial.print(fanState);
151    myFile.print(fanState);
152   }
153  else if (t_1 < maxTemp && t_1 >= normTemp) {
154    Serial.print(fanState);
155     myFile.print(fanState);
156  }
157  else if (t_1 < normTemp) {
158    fanState   = 0;
159    digitalWrite(fanRelay, LOW);
160    Serial.print(fanState);
161    myFile.print(fanState);
162   }
163
164  //
165  // Rain Control
166  //
167
168  if (h_1 < 80 && fanState ==   0) {
169    if (i <= 4) {
170      rainState = 1;
171      digitalWrite(rainRelay,   HIGH);
172      i++;
173    }
174    else if (i > 4 && i <= 300) {
175      rainState   = 2;
176      digitalWrite(rainRelay, LOW);
177      i++;
178    }
179  }
180  else   {
181    rainState = 0;
182    i = 0;
183  }
184  Serial.print(",");
185  Serial.print(rainState);
186   Serial.print(",");
187  Serial.print(i);
188  
189  myFile.println();
190  myFile.close();
191   Serial.println();
192  delay(1000);
193}
194
195void error(char *str) {
196  Serial.print(F("Fehler:   "));
197  Serial.println(str);
198  lcd.clear();
199  lcd.print("Error: ");
200   lcd.print(str);
201  delay(5000);
202  lcd.clear();
203  //while(1); //halt command
204}

#include <DHT.h>
#include <SPI.h>
#include <SD.h>
#include <Wire.h>
#include   <LiquidCrystal_I2C.h>
#include "RTClib.h"

//const int lightRelay = 12;
const   int rainRelay = 11;
const int fanRelay = 8;
const int chipSelect = 10;
const   int DHTPIN_1 = 5;
const int DHTPIN_2 = 6;

int fanState = 0;
int rainState   = 0;

int maxTemp = 29;
int normTemp = 25;

int minHum = 96;

int   i = 0;

LiquidCrystal_I2C lcd(0x27, 16, 2);

#define DHTTYPE DHT22
DHT   dht_1(DHTPIN_1, DHTTYPE);
DHT dht_2(DHTPIN_2, DHTTYPE);
RTC_DS1307 rtc;

File   myFile;
char dateBuffer[12];
char sensBuffer[10];

void setup() {
   Serial.begin(9600);
  while (!Serial) {
    ;
  }

  lcd.init();
   lcd.backlight();
  lcd.setCursor(0, 0);

  if (! rtc.begin()) {
    error("No   RTC");
    Serial.flush();
    abort();
  }

  if (! rtc.isrunning())   {
    error("RTC was off. Setting new time.");
    rtc.adjust(DateTime(F(__DATE__),   F(__TIME__)));
  }
  //rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
   Serial.print(F("Initializing SD card..."));
  if (!SD.begin(chipSelect))   {
    error("SD initialization failed");
    while (1);
  }

  Serial.println(F("initialization   done."));
  if (SD.exists(F("terralog.txt"))) {
    Serial.println(F("terralog.txt   exists."));
  } else {
    Serial.println(F("terralog.txt doesn't exist."));
     Serial.println(F("Creating terraaaaa.txt"));
    myFile = SD.open("terralog.txt",   FILE_WRITE);
    myFile.println("date,time,temp_1,temp_2,hum_1,hum_2,fanState,   rainState,i");
    myFile.close();
    if (SD.exists("terralog.txt")) {
       Serial.println(F("terralog.txt was successfully created."));
    } else   {
      Serial.println(F("File creation failed."));
    }
  }

   pinMode(fanRelay, OUTPUT);
  dht_1.begin();
  dht_2.begin();
  Serial.println(F("date,time,temp_1,temp_2,hum_1,hum_2,fanState,rainState,i"));
}

void   loop() {
  float h_1 = dht_1.readHumidity();
  float t_1 = dht_1.readTemperature();
   if (isnan(h_1) || isnan(t_1)) {
    error("DHT 1");
    return;
  }
   float h_2 = dht_2.readHumidity();
  float t_2 = dht_2.readTemperature();
   if (isnan(h_2) || isnan(t_2)) {
    error("DHT 2");
    return;
  }

   DateTime time = rtc.now();
  lcd.setCursor(0, 0);
  lcd.print(t_1);
   lcd.print(", ");
  lcd.print(h_1);
  lcd.setCursor(0, 1);
  lcd.print(t_2);
   lcd.print(", ");
  lcd.print(h_2);

  sprintf(dateBuffer, "%02u-%02u-%04u",   time.day(), time.month(), time.year());
  Serial.print(dateBuffer);
  Serial.print(",");
   sprintf(dateBuffer, "%02u:%02u:%02u", time.hour(), time.minute(), time.second());
   Serial.print(dateBuffer);
  Serial.print(F(","));
  Serial.print(t_1);
   Serial.print(F(","));
  Serial.print(t_2);
  Serial.print(F(","));
   Serial.print(h_1);
  Serial.print(F(","));
  Serial.print(h_2);
  Serial.print(F(","));

   File myFile = SD.open("terralog.txt", FILE_WRITE);
  if (!myFile) {
    error("logfile");
   }
  sprintf(dateBuffer, "%02u-%02u-%04u", time.day(), time.month(), time.year());
   myFile.print(dateBuffer);
  myFile.print(",");
  sprintf(dateBuffer, "%02u:%02u:%02u",   time.hour(), time.minute(), time.second());
  myFile.print(dateBuffer);
  myFile.print(",");
   myFile.print(t_1);
  myFile.print(",");
  myFile.print(t_2);
  myFile.print(",");
   myFile.print(h_1);
  myFile.print(",");
  myFile.print(h_2);
  myFile.print(",");

   //
  // Temperature Control
  //

  if (t_1 >= maxTemp) {
    fanState   = 1;
    digitalWrite(fanRelay, HIGH);
    Serial.print(fanState);
    myFile.print(fanState);
   }
  else if (t_1 < maxTemp && t_1 >= normTemp) {
    Serial.print(fanState);
     myFile.print(fanState);
  }
  else if (t_1 < normTemp) {
    fanState   = 0;
    digitalWrite(fanRelay, LOW);
    Serial.print(fanState);
    myFile.print(fanState);
   }

  //
  // Rain Control
  //

  if (h_1 < 80 && fanState ==   0) {
    if (i <= 4) {
      rainState = 1;
      digitalWrite(rainRelay,   HIGH);
      i++;
    }
    else if (i > 4 && i <= 300) {
      rainState   = 2;
      digitalWrite(rainRelay, LOW);
      i++;
    }
  }
  else   {
    rainState = 0;
    i = 0;
  }
  Serial.print(",");
  Serial.print(rainState);
   Serial.print(",");
  Serial.print(i);
  
  myFile.println();
  myFile.close();
   Serial.println();
  delay(1000);
}

void error(char *str) {
  Serial.print(F("Fehler:   "));
  Serial.println(str);
  lcd.clear();
  lcd.print("Error: ");
   lcd.print(str);
  delay(5000);
  lcd.clear();
  //while(1); //halt command
}

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