Temperature and Humidity sensor with LED Lights

1/* Created by Ralph Nader on 1/10/19.
2   Copyright  2019 Ralph Nader.  All rights reserved.
3   Made with  for everyone.
4   Spread your knowledge.
5   If you have any error or question, email me at "ralph@driple.co".
6*/
7#include  <LiquidCrystal.h>             // Include the LiquidCrystal library.
8#include  "DHT.h"                       // Include the DHT library.
9
10#define DHTPIN  8                       // Set the DHT Pin.
11#define DHTTYPE DHT11                  //  Set the DHT type.
12
13LiquidCrystal lcd(1, 2, 4, 5, 6, 7);   // Creates a LiquidCrystal  object. Parameters: (RS, Enable (E), d4, d5, d6, d7).
14DHT dht(DHTPIN, DHTTYPE);              // Creates a DHT object. Parameters: (DHT Pin, DHT Type).
15
16const  int yellowLED = 9;               // Adds a led light (in that case, it is yellow)  to pin 9.
17const int blueLED = 10;                // Adds a led light (in that  case, it is blue) to pin 10.
18const int whiteLED = 11;               // Adds a  led light (in that case, it is white) to pin 11.
19
20void setup() {
21  lcd.begin(16,  2);                    // Initializes the interface to the LCD screen, and specifies  the dimensions (width and height) of the display.
22  lcd.setCursor(0, 0);                 //  Set the cursor to column 0, line 0.
23  pinMode(blueLED, OUTPUT);            //  Change to output the blue pin.
24  pinMode(yellowLED, OUTPUT);          // Change  to output the yellow pin.
25  pinMode(whiteLED, OUTPUT);           // Change to  output the white pin.
26
27  dht.begin();                         // Launch the  DHT11 sensor.
28  digitalWrite(blueLED,LOW);           // Turn off LED.
29  digitalWrite(yellowLED,LOW);         // Turn off LED.
30  digitalWrite(whiteLED, LOW);         // Turn off  LED.
31
32  lcd.print("Temperature:");           // Print "Temperature:" on  LCD Screen.
33  
34  lcd.setCursor(0, 1);                 // Set the cursor to  column 0, line 1.
35  lcd.print("Humidity   :");           // Print "Humidity:"  on LCD Screen.
36}
37
38void loop() {
39  delay(500);                         //  Wait 0.5 seconds before updating the values.
40  float T = dht.readTemperature();    // Read temperature in Celsius. If you want the Temperature in Fahrenheit, simply  add "true" between the parentheses ==> float T = dht.readTemperature(True);
41  float H = dht.readHumidity();       // Read humidity in percentage.
42
43  if  (isnan(H) && isnan(T)) {         // See if H (the Humidity variable) is NaN (Not  A Number) && (Logical AND) See if T (the Temperature variable) is NaN to show error.  
44    lcd.print("ERROR");               // Print error where there's the error.
45    return;                           // Repeat the process with each update (each  second).
46  }
47
48  if(T>22){                           // See if the temperature  is bigger than 22C.
49    digitalWrite(yellowLED, HIGH);    // The yellow led will  turn on.
50    digitalWrite(blueLED, LOW);       // The blue led will turn off.
51    digitalWrite(whiteLED, LOW);      // The white led will turn off.s
52    
53  }
54  else if(T<22){                      // If the temperature is smaller than  22C.
55    digitalWrite(blueLED, HIGH);      // The blue led will turn on.
56    digitalWrite(yellowLED, LOW);     // The yellow led will turn off.
57    digitalWrite(whiteLED,  LOW);      // The white led will turn off.
58  }
59
60  else if(T=22){                      //  If the temperature is equal than 22C.
61    digitalWrite(whiteLED, HIGH);     //  The white led will turn on.
62    digitalWrite(yellowLED, LOW);     // The yellow  led will turn off.
63    digitalWrite(blueLED, LOW);       // The blue led will  turn off.
64  }
65
66  lcd.setCursor(12, 0);               // Set the cursor  to column 12, line 0.
67  lcd.print(T);                       // Print the temperature.
68  lcd.setCursor(12, 1);               // Set the cursor to column 12, line 1.
69  lcd.print(H);                       // Print the humidity level.
70}

1/* Created by Ralph Nader on 1/10/19.
2   Copyright  2019 Ralph Nader.
3  All rights reserved.
4   Made with  for everyone.
5   Spread your knowledge.
6
7   If you have any error or question, email me at "ralph@driple.co".
8*/
9#include
10  <LiquidCrystal.h>             // Include the LiquidCrystal library.
11#include
12  "DHT.h"                       // Include the DHT library.
13
14#define DHTPIN
15  8                       // Set the DHT Pin.
16#define DHTTYPE DHT11                  //
17  Set the DHT type.
18
19LiquidCrystal lcd(1, 2, 4, 5, 6, 7);   // Creates a LiquidCrystal
20  object. Parameters: (RS, Enable (E), d4, d5, d6, d7).
21DHT dht(DHTPIN, DHTTYPE);
22              // Creates a DHT object. Parameters: (DHT Pin, DHT Type).
23
24const
25  int yellowLED = 9;               // Adds a led light (in that case, it is yellow)
26  to pin 9.
27const int blueLED = 10;                // Adds a led light (in that
28  case, it is blue) to pin 10.
29const int whiteLED = 11;               // Adds a
30  led light (in that case, it is white) to pin 11.
31
32void setup() {
33  lcd.begin(16,
34  2);                    // Initializes the interface to the LCD screen, and specifies
35  the dimensions (width and height) of the display.
36  lcd.setCursor(0, 0);                 //
37  Set the cursor to column 0, line 0.
38  pinMode(blueLED, OUTPUT);            //
39  Change to output the blue pin.
40  pinMode(yellowLED, OUTPUT);          // Change
41  to output the yellow pin.
42  pinMode(whiteLED, OUTPUT);           // Change to
43  output the white pin.
44
45  dht.begin();                         // Launch the
46  DHT11 sensor.
47  digitalWrite(blueLED,LOW);           // Turn off LED.
48  digitalWrite(yellowLED,LOW);
49         // Turn off LED.
50  digitalWrite(whiteLED, LOW);         // Turn off
51  LED.
52
53  lcd.print("Temperature:");           // Print "Temperature:" on
54  LCD Screen.
55  
56  lcd.setCursor(0, 1);                 // Set the cursor to
57  column 0, line 1.
58  lcd.print("Humidity   :");           // Print "Humidity:"
59  on LCD Screen.
60}
61
62void loop() {
63  delay(500);                         //
64  Wait 0.5 seconds before updating the values.
65  float T = dht.readTemperature();
66    // Read temperature in Celsius. If you want the Temperature in Fahrenheit, simply
67  add "true" between the parentheses ==> float T = dht.readTemperature(True);
68
69  float H = dht.readHumidity();       // Read humidity in percentage.
70
71  if
72  (isnan(H) && isnan(T)) {         // See if H (the Humidity variable) is NaN (Not
73  A Number) && (Logical AND) See if T (the Temperature variable) is NaN to show error.
74  
75    lcd.print("ERROR");               // Print error where there's the error.
76
77    return;                           // Repeat the process with each update (each
78  second).
79  }
80
81  if(T>22){                           // See if the temperature
82  is bigger than 22C.
83    digitalWrite(yellowLED, HIGH);    // The yellow led will
84  turn on.
85    digitalWrite(blueLED, LOW);       // The blue led will turn off.
86
87    digitalWrite(whiteLED, LOW);      // The white led will turn off.s
88    
89
90  }
91  else if(T<22){                      // If the temperature is smaller than
92  22C.
93    digitalWrite(blueLED, HIGH);      // The blue led will turn on.
94
95    digitalWrite(yellowLED, LOW);     // The yellow led will turn off.
96    digitalWrite(whiteLED,
97  LOW);      // The white led will turn off.
98  }
99
100  else if(T=22){                      //
101  If the temperature is equal than 22C.
102    digitalWrite(whiteLED, HIGH);     //
103  The white led will turn on.
104    digitalWrite(yellowLED, LOW);     // The yellow
105  led will turn off.
106    digitalWrite(blueLED, LOW);       // The blue led will
107  turn off.
108  }
109
110  lcd.setCursor(12, 0);               // Set the cursor
111  to column 12, line 0.
112  lcd.print(T);                       // Print the temperature.
113
114  lcd.setCursor(12, 1);               // Set the cursor to column 12, line 1.
115
116  lcd.print(H);                       // Print the humidity level.
117}